./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ --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 4f7f32f81229c7756ac3848f16abf37868e5b5283c2f5648c26317015a8240dd --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:20:17,269 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:20:17,393 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:20:17,400 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:20:17,401 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:20:17,445 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:20:17,446 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:20:17,446 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:20:17,447 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:20:17,452 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:20:17,453 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:20:17,454 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:20:17,454 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:20:17,456 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:20:17,456 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:20:17,457 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:20:17,457 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:20:17,458 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:20:17,458 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:20:17,459 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:20:17,459 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:20:17,460 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:20:17,461 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:20:17,461 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:20:17,462 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:20:17,462 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:20:17,463 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:20:17,463 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:20:17,464 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:20:17,464 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:20:17,465 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:20:17,466 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:20:17,466 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:20:17,466 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:20:17,467 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:20:17,467 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:20:17,467 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:20:17,467 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:20:17,468 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:20:17,468 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:20:17,468 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:20:17,469 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:20:17,469 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:20:17,469 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:20:17,470 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:20:17,470 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_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4f7f32f81229c7756ac3848f16abf37868e5b5283c2f5648c26317015a8240dd [2023-11-19 05:20:17,759 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:20:17,780 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:20:17,783 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:20:17,785 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:20:17,788 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:20:17,790 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c [2023-11-19 05:20:21,048 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:20:21,467 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:20:21,469 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c [2023-11-19 05:20:21,498 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/data/3a8deec38/5e9a3ce3f77c40fe82f5465ed679e3e0/FLAGf77990a75 [2023-11-19 05:20:21,516 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/data/3a8deec38/5e9a3ce3f77c40fe82f5465ed679e3e0 [2023-11-19 05:20:21,519 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:20:21,520 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:20:21,522 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:20:21,522 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:20:21,529 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:20:21,530 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:20:21" (1/1) ... [2023-11-19 05:20:21,532 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75456d61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:21, skipping insertion in model container [2023-11-19 05:20:21,532 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:20:21" (1/1) ... [2023-11-19 05:20:21,610 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:20:22,208 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_e1b272b0-8325-47a5-aca9-9b2603228507/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c[73003,73016] [2023-11-19 05:20:22,213 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:20:22,237 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:20:22,249 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [48] [2023-11-19 05:20:22,251 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [1613] [2023-11-19 05:20:22,252 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [1707] [2023-11-19 05:20:22,252 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [1825] [2023-11-19 05:20:22,253 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [2012] [2023-11-19 05:20:22,254 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [2030] [2023-11-19 05:20:22,254 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2381] [2023-11-19 05:20:22,255 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [3042] [2023-11-19 05:20:22,255 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [3077] [2023-11-19 05:20:22,255 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [3443] [2023-11-19 05:20:22,515 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_e1b272b0-8325-47a5-aca9-9b2603228507/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c[73003,73016] [2023-11-19 05:20:22,515 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:20:22,549 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:20:22,549 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22 WrapperNode [2023-11-19 05:20:22,550 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:20:22,551 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:20:22,551 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:20:22,551 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:20:22,560 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,611 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,689 INFO L138 Inliner]: procedures = 93, calls = 348, calls flagged for inlining = 25, calls inlined = 22, statements flattened = 1134 [2023-11-19 05:20:22,690 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:20:22,691 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:20:22,691 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:20:22,691 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:20:22,703 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,703 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,722 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,723 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,749 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,766 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,774 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,781 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,794 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:20:22,795 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:20:22,795 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:20:22,796 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:20:22,797 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (1/1) ... [2023-11-19 05:20:22,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:20:22,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:22,863 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:20:22,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:20:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:20:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-19 05:20:22,907 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-19 05:20:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-19 05:20:22,908 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-19 05:20:22,908 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-19 05:20:22,908 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-19 05:20:22,908 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-19 05:20:22,908 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-19 05:20:22,908 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-19 05:20:22,909 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-19 05:20:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-19 05:20:22,909 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-19 05:20:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-19 05:20:22,909 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-19 05:20:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-19 05:20:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-19 05:20:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-19 05:20:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-19 05:20:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-19 05:20:22,910 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-19 05:20:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-19 05:20:22,911 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-19 05:20:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-19 05:20:22,911 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-19 05:20:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-19 05:20:22,911 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-19 05:20:22,911 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-19 05:20:22,912 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-19 05:20:22,912 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-19 05:20:22,912 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-19 05:20:22,912 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-19 05:20:22,912 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-19 05:20:22,912 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-19 05:20:22,912 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-19 05:20:22,913 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-19 05:20:22,913 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-19 05:20:22,913 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-19 05:20:22,913 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-19 05:20:22,913 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-19 05:20:22,913 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-19 05:20:22,913 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-19 05:20:22,914 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-19 05:20:22,914 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-19 05:20:22,914 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-19 05:20:22,914 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:20:22,914 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-19 05:20:22,914 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-19 05:20:22,915 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-19 05:20:22,915 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-19 05:20:22,915 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-19 05:20:22,915 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-19 05:20:22,915 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-19 05:20:22,915 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-19 05:20:22,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:20:22,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:20:22,916 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-19 05:20:22,916 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-19 05:20:23,071 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:20:23,074 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:20:24,336 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:20:25,206 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:20:25,207 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:20:25,224 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:20:25 BoogieIcfgContainer [2023-11-19 05:20:25,224 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:20:25,228 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:20:25,228 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:20:25,234 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:20:25,234 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:20:21" (1/3) ... [2023-11-19 05:20:25,235 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b013a21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:20:25, skipping insertion in model container [2023-11-19 05:20:25,235 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:22" (2/3) ... [2023-11-19 05:20:25,235 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b013a21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:20:25, skipping insertion in model container [2023-11-19 05:20:25,236 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:20:25" (3/3) ... [2023-11-19 05:20:25,237 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product27.cil.c [2023-11-19 05:20:25,280 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:20:25,281 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:20:25,372 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:20:25,381 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;@edbb08d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:20:25,381 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:20:25,391 INFO L276 IsEmpty]: Start isEmpty. Operand has 410 states, 273 states have (on average 1.5677655677655677) internal successors, (428), 291 states have internal predecessors, (428), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-19 05:20:25,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-19 05:20:25,426 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:25,427 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:25,428 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:25,435 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:25,436 INFO L85 PathProgramCache]: Analyzing trace with hash -902158784, now seen corresponding path program 1 times [2023-11-19 05:20:25,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:25,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113583066] [2023-11-19 05:20:25,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:25,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:25,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:26,667 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:20:26,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:26,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113583066] [2023-11-19 05:20:26,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113583066] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:26,669 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:20:26,669 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:20:26,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27763158] [2023-11-19 05:20:26,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:26,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:20:26,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:26,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:20:26,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:20:26,733 INFO L87 Difference]: Start difference. First operand has 410 states, 273 states have (on average 1.5677655677655677) internal successors, (428), 291 states have internal predecessors, (428), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-19 05:20:27,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:27,874 INFO L93 Difference]: Finished difference Result 1213 states and 1944 transitions. [2023-11-19 05:20:27,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:20:27,878 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2023-11-19 05:20:27,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:27,908 INFO L225 Difference]: With dead ends: 1213 [2023-11-19 05:20:27,909 INFO L226 Difference]: Without dead ends: 805 [2023-11-19 05:20:27,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:20:27,928 INFO L413 NwaCegarLoop]: 665 mSDtfsCounter, 633 mSDsluCounter, 2362 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 648 SdHoareTripleChecker+Valid, 3027 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:27,930 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [648 Valid, 3027 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 05:20:27,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 805 states. [2023-11-19 05:20:28,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 805 to 754. [2023-11-19 05:20:28,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 514 states have (on average 1.5603112840466926) internal successors, (802), 544 states have internal predecessors, (802), 193 states have call successors, (193), 49 states have call predecessors, (193), 46 states have return successors, (200), 180 states have call predecessors, (200), 189 states have call successors, (200) [2023-11-19 05:20:28,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1195 transitions. [2023-11-19 05:20:28,107 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1195 transitions. Word has length 88 [2023-11-19 05:20:28,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:28,108 INFO L495 AbstractCegarLoop]: Abstraction has 754 states and 1195 transitions. [2023-11-19 05:20:28,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-19 05:20:28,109 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1195 transitions. [2023-11-19 05:20:28,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-19 05:20:28,118 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:28,119 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:28,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:20:28,119 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:28,120 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:28,120 INFO L85 PathProgramCache]: Analyzing trace with hash 672211433, now seen corresponding path program 1 times [2023-11-19 05:20:28,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:28,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526169544] [2023-11-19 05:20:28,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:28,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:28,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:28,633 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:20:28,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:28,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526169544] [2023-11-19 05:20:28,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526169544] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:28,635 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684718828] [2023-11-19 05:20:28,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:28,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:28,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:28,637 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:28,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:20:29,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:29,042 INFO L262 TraceCheckSpWp]: Trace formula consists of 1574 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:20:29,054 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:29,201 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:20:29,201 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:29,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684718828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:29,202 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:29,202 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:20:29,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195040961] [2023-11-19 05:20:29,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:29,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:29,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:29,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:29,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:29,206 INFO L87 Difference]: Start difference. First operand 754 states and 1195 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:20:29,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:29,494 INFO L93 Difference]: Finished difference Result 2138 states and 3454 transitions. [2023-11-19 05:20:29,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:29,495 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2023-11-19 05:20:29,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:29,508 INFO L225 Difference]: With dead ends: 2138 [2023-11-19 05:20:29,509 INFO L226 Difference]: Without dead ends: 1396 [2023-11-19 05:20:29,515 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:29,516 INFO L413 NwaCegarLoop]: 1023 mSDtfsCounter, 564 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1528 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:29,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1528 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:20:29,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1396 states. [2023-11-19 05:20:29,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1396 to 1363. [2023-11-19 05:20:29,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1363 states, 936 states have (on average 1.5694444444444444) internal successors, (1469), 995 states have internal predecessors, (1469), 339 states have call successors, (339), 88 states have call predecessors, (339), 87 states have return successors, (366), 319 states have call predecessors, (366), 335 states have call successors, (366) [2023-11-19 05:20:29,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1363 states to 1363 states and 2174 transitions. [2023-11-19 05:20:29,705 INFO L78 Accepts]: Start accepts. Automaton has 1363 states and 2174 transitions. Word has length 87 [2023-11-19 05:20:29,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:29,706 INFO L495 AbstractCegarLoop]: Abstraction has 1363 states and 2174 transitions. [2023-11-19 05:20:29,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:20:29,707 INFO L276 IsEmpty]: Start isEmpty. Operand 1363 states and 2174 transitions. [2023-11-19 05:20:29,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-19 05:20:29,713 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:29,713 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:29,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:29,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-19 05:20:29,929 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:29,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:29,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1192664521, now seen corresponding path program 1 times [2023-11-19 05:20:29,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:29,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388810225] [2023-11-19 05:20:29,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:29,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:29,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:20:30,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:30,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388810225] [2023-11-19 05:20:30,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388810225] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:30,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256134293] [2023-11-19 05:20:30,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:30,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:30,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:30,409 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:30,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:20:30,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:30,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:20:30,827 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:30,853 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:20:30,854 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:30,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256134293] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:30,855 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:30,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:20:30,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451308669] [2023-11-19 05:20:30,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:30,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:30,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:30,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:30,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:30,860 INFO L87 Difference]: Start difference. First operand 1363 states and 2174 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:20:31,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:31,107 INFO L93 Difference]: Finished difference Result 2748 states and 4427 transitions. [2023-11-19 05:20:31,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:31,108 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 89 [2023-11-19 05:20:31,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:31,121 INFO L225 Difference]: With dead ends: 2748 [2023-11-19 05:20:31,122 INFO L226 Difference]: Without dead ends: 1397 [2023-11-19 05:20:31,138 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:31,141 INFO L413 NwaCegarLoop]: 603 mSDtfsCounter, 20 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1170 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:31,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 1170 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:20:31,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1397 states. [2023-11-19 05:20:31,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1397 to 1391. [2023-11-19 05:20:31,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1391 states, 960 states have (on average 1.559375) internal successors, (1497), 1019 states have internal predecessors, (1497), 343 states have call successors, (343), 88 states have call predecessors, (343), 87 states have return successors, (370), 323 states have call predecessors, (370), 339 states have call successors, (370) [2023-11-19 05:20:31,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1391 states to 1391 states and 2210 transitions. [2023-11-19 05:20:31,246 INFO L78 Accepts]: Start accepts. Automaton has 1391 states and 2210 transitions. Word has length 89 [2023-11-19 05:20:31,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:31,246 INFO L495 AbstractCegarLoop]: Abstraction has 1391 states and 2210 transitions. [2023-11-19 05:20:31,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-19 05:20:31,247 INFO L276 IsEmpty]: Start isEmpty. Operand 1391 states and 2210 transitions. [2023-11-19 05:20:31,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-19 05:20:31,251 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:31,251 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:31,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:31,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:31,464 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:31,464 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:31,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1308187780, now seen corresponding path program 1 times [2023-11-19 05:20:31,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:31,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711590857] [2023-11-19 05:20:31,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:31,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:31,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:31,887 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:20:31,888 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:31,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711590857] [2023-11-19 05:20:31,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711590857] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:31,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267896248] [2023-11-19 05:20:31,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:31,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:31,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:31,890 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:31,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:20:32,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:32,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 1575 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:20:32,243 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:32,331 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 05:20:32,331 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:32,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267896248] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:32,332 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:32,332 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-19 05:20:32,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101670024] [2023-11-19 05:20:32,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:32,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:32,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:32,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:32,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:32,335 INFO L87 Difference]: Start difference. First operand 1391 states and 2210 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:20:32,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:32,628 INFO L93 Difference]: Finished difference Result 3412 states and 5496 transitions. [2023-11-19 05:20:32,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:32,628 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 88 [2023-11-19 05:20:32,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:32,647 INFO L225 Difference]: With dead ends: 3412 [2023-11-19 05:20:32,648 INFO L226 Difference]: Without dead ends: 2033 [2023-11-19 05:20:32,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:32,660 INFO L413 NwaCegarLoop]: 1068 mSDtfsCounter, 563 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 563 SdHoareTripleChecker+Valid, 1574 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:32,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [563 Valid, 1574 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:20:32,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2023-11-19 05:20:32,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 1988. [2023-11-19 05:20:32,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1988 states, 1376 states have (on average 1.565406976744186) internal successors, (2154), 1464 states have internal predecessors, (2154), 486 states have call successors, (486), 124 states have call predecessors, (486), 125 states have return successors, (533), 459 states have call predecessors, (533), 482 states have call successors, (533) [2023-11-19 05:20:32,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1988 states to 1988 states and 3173 transitions. [2023-11-19 05:20:32,815 INFO L78 Accepts]: Start accepts. Automaton has 1988 states and 3173 transitions. Word has length 88 [2023-11-19 05:20:32,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:32,816 INFO L495 AbstractCegarLoop]: Abstraction has 1988 states and 3173 transitions. [2023-11-19 05:20:32,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 05:20:32,817 INFO L276 IsEmpty]: Start isEmpty. Operand 1988 states and 3173 transitions. [2023-11-19 05:20:32,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-19 05:20:32,823 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:32,823 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:32,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-19 05:20:33,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:33,037 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:33,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:33,037 INFO L85 PathProgramCache]: Analyzing trace with hash 234902561, now seen corresponding path program 1 times [2023-11-19 05:20:33,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:33,037 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511421398] [2023-11-19 05:20:33,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:33,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:33,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:33,369 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-19 05:20:33,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:33,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511421398] [2023-11-19 05:20:33,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511421398] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:33,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674675458] [2023-11-19 05:20:33,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:33,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:33,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:33,372 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:33,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:20:33,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:33,723 INFO L262 TraceCheckSpWp]: Trace formula consists of 1588 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:20:33,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:33,835 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:20:33,836 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:33,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674675458] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:33,836 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:33,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-11-19 05:20:33,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087826005] [2023-11-19 05:20:33,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:33,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:20:33,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:33,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:20:33,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2023-11-19 05:20:33,839 INFO L87 Difference]: Start difference. First operand 1988 states and 3173 transitions. Second operand has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-19 05:20:35,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:35,014 INFO L93 Difference]: Finished difference Result 5291 states and 8553 transitions. [2023-11-19 05:20:35,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:20:35,015 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 89 [2023-11-19 05:20:35,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:35,050 INFO L225 Difference]: With dead ends: 5291 [2023-11-19 05:20:35,050 INFO L226 Difference]: Without dead ends: 3315 [2023-11-19 05:20:35,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:20:35,081 INFO L413 NwaCegarLoop]: 606 mSDtfsCounter, 518 mSDsluCounter, 2121 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 2727 SdHoareTripleChecker+Invalid, 731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:35,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [523 Valid, 2727 Invalid, 731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 05:20:35,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3315 states. [2023-11-19 05:20:35,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3315 to 3282. [2023-11-19 05:20:35,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3282 states, 2263 states have (on average 1.5081749889527176) internal successors, (3413), 2412 states have internal predecessors, (3413), 803 states have call successors, (803), 220 states have call predecessors, (803), 215 states have return successors, (906), 745 states have call predecessors, (906), 797 states have call successors, (906) [2023-11-19 05:20:35,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3282 states to 3282 states and 5122 transitions. [2023-11-19 05:20:35,336 INFO L78 Accepts]: Start accepts. Automaton has 3282 states and 5122 transitions. Word has length 89 [2023-11-19 05:20:35,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:35,336 INFO L495 AbstractCegarLoop]: Abstraction has 3282 states and 5122 transitions. [2023-11-19 05:20:35,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-19 05:20:35,337 INFO L276 IsEmpty]: Start isEmpty. Operand 3282 states and 5122 transitions. [2023-11-19 05:20:35,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-19 05:20:35,342 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:35,342 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:35,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:35,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:35,552 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:35,552 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:35,552 INFO L85 PathProgramCache]: Analyzing trace with hash -707606082, now seen corresponding path program 1 times [2023-11-19 05:20:35,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:35,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014735592] [2023-11-19 05:20:35,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:35,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:35,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:20:36,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:36,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014735592] [2023-11-19 05:20:36,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014735592] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:36,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412859339] [2023-11-19 05:20:36,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:36,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:36,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:36,350 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:36,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:20:36,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:36,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 1602 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 05:20:36,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:37,092 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:20:37,093 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:37,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412859339] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:37,093 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:37,093 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 15 [2023-11-19 05:20:37,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620420986] [2023-11-19 05:20:37,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:37,094 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:20:37,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:37,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:20:37,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:20:37,096 INFO L87 Difference]: Start difference. First operand 3282 states and 5122 transitions. Second operand has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-19 05:20:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:38,965 INFO L93 Difference]: Finished difference Result 6913 states and 10779 transitions. [2023-11-19 05:20:38,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:20:38,966 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 94 [2023-11-19 05:20:38,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:39,002 INFO L225 Difference]: With dead ends: 6913 [2023-11-19 05:20:39,002 INFO L226 Difference]: Without dead ends: 3643 [2023-11-19 05:20:39,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:20:39,031 INFO L413 NwaCegarLoop]: 612 mSDtfsCounter, 1328 mSDsluCounter, 1445 mSDsCounter, 0 mSdLazyCounter, 1387 mSolverCounterSat, 137 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1331 SdHoareTripleChecker+Valid, 2057 SdHoareTripleChecker+Invalid, 1524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 1387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:39,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1331 Valid, 2057 Invalid, 1524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 1387 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-11-19 05:20:39,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3643 states. [2023-11-19 05:20:39,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3643 to 3622. [2023-11-19 05:20:39,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3622 states, 2519 states have (on average 1.4890829694323144) internal successors, (3751), 2676 states have internal predecessors, (3751), 863 states have call successors, (863), 248 states have call predecessors, (863), 239 states have return successors, (968), 793 states have call predecessors, (968), 857 states have call successors, (968) [2023-11-19 05:20:39,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3622 states to 3622 states and 5582 transitions. [2023-11-19 05:20:39,413 INFO L78 Accepts]: Start accepts. Automaton has 3622 states and 5582 transitions. Word has length 94 [2023-11-19 05:20:39,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:39,414 INFO L495 AbstractCegarLoop]: Abstraction has 3622 states and 5582 transitions. [2023-11-19 05:20:39,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-19 05:20:39,415 INFO L276 IsEmpty]: Start isEmpty. Operand 3622 states and 5582 transitions. [2023-11-19 05:20:39,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-19 05:20:39,418 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:39,418 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:39,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:39,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:20:39,632 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:39,633 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:39,633 INFO L85 PathProgramCache]: Analyzing trace with hash -603160510, now seen corresponding path program 1 times [2023-11-19 05:20:39,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:39,633 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460653086] [2023-11-19 05:20:39,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:39,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:39,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:40,360 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 05:20:40,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:40,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460653086] [2023-11-19 05:20:40,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460653086] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:40,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385952238] [2023-11-19 05:20:40,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:40,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:40,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:40,364 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:40,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:20:40,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:40,780 INFO L262 TraceCheckSpWp]: Trace formula consists of 1616 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:20:40,786 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:40,851 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:20:40,851 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:40,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385952238] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:40,852 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:40,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2023-11-19 05:20:40,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230951299] [2023-11-19 05:20:40,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:40,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:20:40,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:40,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:20:40,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:20:40,856 INFO L87 Difference]: Start difference. First operand 3622 states and 5582 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-19 05:20:41,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:41,517 INFO L93 Difference]: Finished difference Result 7243 states and 11380 transitions. [2023-11-19 05:20:41,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:20:41,518 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 99 [2023-11-19 05:20:41,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:41,571 INFO L225 Difference]: With dead ends: 7243 [2023-11-19 05:20:41,571 INFO L226 Difference]: Without dead ends: 4462 [2023-11-19 05:20:41,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:20:41,597 INFO L413 NwaCegarLoop]: 614 mSDtfsCounter, 139 mSDsluCounter, 2425 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 3039 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:41,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 3039 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:20:41,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4462 states. [2023-11-19 05:20:41,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4462 to 4045. [2023-11-19 05:20:41,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4045 states, 2757 states have (on average 1.481682988755894) internal successors, (4085), 2973 states have internal predecessors, (4085), 1033 states have call successors, (1033), 248 states have call predecessors, (1033), 254 states have return successors, (1184), 961 states have call predecessors, (1184), 1027 states have call successors, (1184) [2023-11-19 05:20:41,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4045 states to 4045 states and 6302 transitions. [2023-11-19 05:20:41,959 INFO L78 Accepts]: Start accepts. Automaton has 4045 states and 6302 transitions. Word has length 99 [2023-11-19 05:20:41,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:41,960 INFO L495 AbstractCegarLoop]: Abstraction has 4045 states and 6302 transitions. [2023-11-19 05:20:41,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-19 05:20:41,961 INFO L276 IsEmpty]: Start isEmpty. Operand 4045 states and 6302 transitions. [2023-11-19 05:20:41,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-19 05:20:41,966 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:41,966 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:41,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:42,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 05:20:42,189 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:42,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:42,189 INFO L85 PathProgramCache]: Analyzing trace with hash 2025680292, now seen corresponding path program 1 times [2023-11-19 05:20:42,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:42,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064794466] [2023-11-19 05:20:42,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:42,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:42,869 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-19 05:20:42,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:42,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064794466] [2023-11-19 05:20:42,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064794466] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:42,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706224433] [2023-11-19 05:20:42,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:42,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:42,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:42,872 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:42,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:20:43,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:43,249 INFO L262 TraceCheckSpWp]: Trace formula consists of 1627 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 05:20:43,259 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:43,558 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:20:43,558 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:43,881 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 05:20:43,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706224433] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:43,882 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:20:43,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2023-11-19 05:20:43,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148081294] [2023-11-19 05:20:43,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:43,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:20:43,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:43,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:20:43,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:20:43,884 INFO L87 Difference]: Start difference. First operand 4045 states and 6302 transitions. Second operand has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-19 05:20:47,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:47,667 INFO L93 Difference]: Finished difference Result 10793 states and 17327 transitions. [2023-11-19 05:20:47,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-19 05:20:47,672 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) Word has length 103 [2023-11-19 05:20:47,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:47,745 INFO L225 Difference]: With dead ends: 10793 [2023-11-19 05:20:47,745 INFO L226 Difference]: Without dead ends: 7955 [2023-11-19 05:20:47,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 201 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2023-11-19 05:20:47,762 INFO L413 NwaCegarLoop]: 636 mSDtfsCounter, 2602 mSDsluCounter, 2099 mSDsCounter, 0 mSdLazyCounter, 1936 mSolverCounterSat, 1212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2688 SdHoareTripleChecker+Valid, 2735 SdHoareTripleChecker+Invalid, 3148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1212 IncrementalHoareTripleChecker+Valid, 1936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:47,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2688 Valid, 2735 Invalid, 3148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1212 Valid, 1936 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-11-19 05:20:47,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7955 states. [2023-11-19 05:20:48,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7955 to 7064. [2023-11-19 05:20:48,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7064 states, 5022 states have (on average 1.4900438072481084) internal successors, (7483), 5280 states have internal predecessors, (7483), 1527 states have call successors, (1527), 484 states have call predecessors, (1527), 514 states have return successors, (2020), 1443 states have call predecessors, (2020), 1519 states have call successors, (2020) [2023-11-19 05:20:48,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7064 states to 7064 states and 11030 transitions. [2023-11-19 05:20:48,366 INFO L78 Accepts]: Start accepts. Automaton has 7064 states and 11030 transitions. Word has length 103 [2023-11-19 05:20:48,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:48,367 INFO L495 AbstractCegarLoop]: Abstraction has 7064 states and 11030 transitions. [2023-11-19 05:20:48,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-19 05:20:48,367 INFO L276 IsEmpty]: Start isEmpty. Operand 7064 states and 11030 transitions. [2023-11-19 05:20:48,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2023-11-19 05:20:48,371 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:48,372 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:48,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:48,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:48,592 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:48,592 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:48,592 INFO L85 PathProgramCache]: Analyzing trace with hash 410522874, now seen corresponding path program 1 times [2023-11-19 05:20:48,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:48,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421809951] [2023-11-19 05:20:48,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:48,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:48,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:49,411 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-19 05:20:49,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:49,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421809951] [2023-11-19 05:20:49,412 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421809951] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:49,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143829475] [2023-11-19 05:20:49,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:49,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:49,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:49,414 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:49,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:20:49,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:49,759 INFO L262 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:20:49,765 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:49,940 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 05:20:49,940 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:49,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143829475] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:49,941 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:49,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-11-19 05:20:49,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882265201] [2023-11-19 05:20:49,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:49,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:20:49,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:49,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:20:49,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:20:49,944 INFO L87 Difference]: Start difference. First operand 7064 states and 11030 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-19 05:20:51,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:51,018 INFO L93 Difference]: Finished difference Result 12935 states and 20222 transitions. [2023-11-19 05:20:51,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:20:51,018 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) Word has length 107 [2023-11-19 05:20:51,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:51,082 INFO L225 Difference]: With dead ends: 12935 [2023-11-19 05:20:51,082 INFO L226 Difference]: Without dead ends: 7086 [2023-11-19 05:20:51,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:20:51,111 INFO L413 NwaCegarLoop]: 653 mSDtfsCounter, 424 mSDsluCounter, 1699 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 2352 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:51,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [424 Valid, 2352 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 05:20:51,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7086 states. [2023-11-19 05:20:51,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7086 to 7064. [2023-11-19 05:20:51,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7064 states, 5022 states have (on average 1.4900438072481084) internal successors, (7483), 5280 states have internal predecessors, (7483), 1527 states have call successors, (1527), 484 states have call predecessors, (1527), 514 states have return successors, (2012), 1443 states have call predecessors, (2012), 1519 states have call successors, (2012) [2023-11-19 05:20:51,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7064 states to 7064 states and 11022 transitions. [2023-11-19 05:20:51,669 INFO L78 Accepts]: Start accepts. Automaton has 7064 states and 11022 transitions. Word has length 107 [2023-11-19 05:20:51,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:51,670 INFO L495 AbstractCegarLoop]: Abstraction has 7064 states and 11022 transitions. [2023-11-19 05:20:51,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-19 05:20:51,670 INFO L276 IsEmpty]: Start isEmpty. Operand 7064 states and 11022 transitions. [2023-11-19 05:20:51,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-11-19 05:20:51,676 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:51,677 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:51,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:51,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:51,900 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:51,900 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:51,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1561138954, now seen corresponding path program 1 times [2023-11-19 05:20:51,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:51,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259995371] [2023-11-19 05:20:51,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:51,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:51,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:52,656 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 05:20:52,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:52,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259995371] [2023-11-19 05:20:52,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259995371] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:52,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549707297] [2023-11-19 05:20:52,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:52,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:52,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:52,658 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:52,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:20:53,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:53,037 INFO L262 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-19 05:20:53,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:53,397 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-11-19 05:20:53,397 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:53,912 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-11-19 05:20:53,913 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549707297] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:53,913 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:20:53,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [10, 11] total 27 [2023-11-19 05:20:53,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601328592] [2023-11-19 05:20:53,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:53,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:20:53,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:53,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:20:53,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-11-19 05:20:53,917 INFO L87 Difference]: Start difference. First operand 7064 states and 11022 transitions. Second operand has 11 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 states have internal predecessors, (61), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) [2023-11-19 05:20:59,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:59,511 INFO L93 Difference]: Finished difference Result 14891 states and 23828 transitions. [2023-11-19 05:20:59,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-19 05:20:59,512 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 states have internal predecessors, (61), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) Word has length 134 [2023-11-19 05:20:59,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:59,625 INFO L225 Difference]: With dead ends: 14891 [2023-11-19 05:20:59,625 INFO L226 Difference]: Without dead ends: 14888 [2023-11-19 05:20:59,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 484 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=290, Invalid=2572, Unknown=0, NotChecked=0, Total=2862 [2023-11-19 05:20:59,639 INFO L413 NwaCegarLoop]: 609 mSDtfsCounter, 3522 mSDsluCounter, 2752 mSDsCounter, 0 mSdLazyCounter, 3288 mSolverCounterSat, 1510 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3625 SdHoareTripleChecker+Valid, 3361 SdHoareTripleChecker+Invalid, 4798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1510 IncrementalHoareTripleChecker+Valid, 3288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:59,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3625 Valid, 3361 Invalid, 4798 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1510 Valid, 3288 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2023-11-19 05:20:59,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14888 states. [2023-11-19 05:21:00,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14888 to 13405. [2023-11-19 05:21:00,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13405 states, 9702 states have (on average 1.5086580086580086) internal successors, (14637), 10151 states have internal predecessors, (14637), 2719 states have call successors, (2719), 888 states have call predecessors, (2719), 983 states have return successors, (3640), 2617 states have call predecessors, (3640), 2707 states have call successors, (3640) [2023-11-19 05:21:00,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13405 states to 13405 states and 20996 transitions. [2023-11-19 05:21:00,948 INFO L78 Accepts]: Start accepts. Automaton has 13405 states and 20996 transitions. Word has length 134 [2023-11-19 05:21:00,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:21:00,951 INFO L495 AbstractCegarLoop]: Abstraction has 13405 states and 20996 transitions. [2023-11-19 05:21:00,951 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 6.777777777777778) internal successors, (61), 9 states have internal predecessors, (61), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 5 states have call predecessors, (23), 4 states have call successors, (23) [2023-11-19 05:21:00,951 INFO L276 IsEmpty]: Start isEmpty. Operand 13405 states and 20996 transitions. [2023-11-19 05:21:00,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-11-19 05:21:00,965 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:21:00,965 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:21:00,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:21:01,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:21:01,180 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:21:01,180 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:21:01,180 INFO L85 PathProgramCache]: Analyzing trace with hash -376789069, now seen corresponding path program 1 times [2023-11-19 05:21:01,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:21:01,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209406510] [2023-11-19 05:21:01,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:01,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:21:01,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:01,513 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2023-11-19 05:21:01,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:21:01,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209406510] [2023-11-19 05:21:01,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209406510] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:21:01,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347640972] [2023-11-19 05:21:01,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:21:01,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:21:01,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:21:01,515 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:21:01,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e1b272b0-8325-47a5-aca9-9b2603228507/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:21:01,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:21:01,961 INFO L262 TraceCheckSpWp]: Trace formula consists of 1999 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:21:01,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:21:02,101 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:21:02,101 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:21:02,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347640972] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:21:02,101 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:21:02,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-11-19 05:21:02,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610152391] [2023-11-19 05:21:02,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:21:02,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:21:02,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:21:02,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:21:02,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:21:02,104 INFO L87 Difference]: Start difference. First operand 13405 states and 20996 transitions. Second operand has 8 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 5 states have call successors, (30), 4 states have call predecessors, (30), 5 states have return successors, (28), 6 states have call predecessors, (28), 5 states have call successors, (28)