./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec14_product28.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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec14_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/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 da76b57a1451220816a27c40b8cda655a945b2081fe69d46a431c484896fab87 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:13:29,570 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:13:29,649 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:13:29,656 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:13:29,657 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:13:29,703 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:13:29,704 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:13:29,705 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:13:29,706 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:13:29,706 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:13:29,707 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:13:29,708 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:13:29,708 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:13:29,709 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:13:29,709 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:13:29,710 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:13:29,711 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:13:29,711 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:13:29,712 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:13:29,712 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:13:29,713 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:13:29,714 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:13:29,715 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:13:29,715 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:13:29,716 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:13:29,716 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:13:29,716 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:13:29,717 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:13:29,717 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:13:29,718 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:13:29,718 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:13:29,719 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:13:29,719 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:13:29,719 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:13:29,720 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:13:29,720 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:13:29,720 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:13:29,737 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:13:29,737 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:13:29,737 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:13:29,738 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:13:29,738 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:13:29,738 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:13:29,739 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:13:29,739 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:13:29,739 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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> da76b57a1451220816a27c40b8cda655a945b2081fe69d46a431c484896fab87 [2023-11-19 05:13:30,110 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:13:30,139 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:13:30,142 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:13:30,143 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:13:30,144 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:13:30,147 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/product-lines/elevator_spec14_product28.cil.c [2023-11-19 05:13:33,344 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:13:33,809 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:13:33,809 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/sv-benchmarks/c/product-lines/elevator_spec14_product28.cil.c [2023-11-19 05:13:33,848 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/data/f46d8bc04/0c078a497ad346be83fa39b0878fdd62/FLAG3203221ed [2023-11-19 05:13:33,868 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/data/f46d8bc04/0c078a497ad346be83fa39b0878fdd62 [2023-11-19 05:13:33,877 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:13:33,880 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:13:33,884 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:13:33,884 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:13:33,891 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:13:33,895 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:13:33" (1/1) ... [2023-11-19 05:13:33,897 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1080f0c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:33, skipping insertion in model container [2023-11-19 05:13:33,897 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:13:33" (1/1) ... [2023-11-19 05:13:33,997 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:13:34,567 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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/sv-benchmarks/c/product-lines/elevator_spec14_product28.cil.c[43703,43716] [2023-11-19 05:13:34,673 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:13:34,691 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:13:34,720 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [48] [2023-11-19 05:13:34,722 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification14_spec.i","") [86] [2023-11-19 05:13:34,722 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [131] [2023-11-19 05:13:34,723 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [252] [2023-11-19 05:13:34,723 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [1852] [2023-11-19 05:13:34,724 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [1870] [2023-11-19 05:13:34,725 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [2220] [2023-11-19 05:13:34,725 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [2229] [2023-11-19 05:13:34,725 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2320] [2023-11-19 05:13:34,725 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [2981] [2023-11-19 05:13:34,863 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_64de062b-e287-4de1-ad6b-cca6fbcd93f6/sv-benchmarks/c/product-lines/elevator_spec14_product28.cil.c[43703,43716] [2023-11-19 05:13:34,910 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:13:34,949 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:13:34,950 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34 WrapperNode [2023-11-19 05:13:34,950 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:13:34,951 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:13:34,951 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:13:34,952 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:13:34,960 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,000 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,062 INFO L138 Inliner]: procedures = 94, calls = 341, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 1103 [2023-11-19 05:13:35,062 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:13:35,063 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:13:35,063 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:13:35,063 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:13:35,079 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,079 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,091 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,092 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,117 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,131 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,137 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,144 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,154 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:13:35,155 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:13:35,155 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:13:35,155 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:13:35,156 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (1/1) ... [2023-11-19 05:13:35,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:13:35,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:35,195 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:13:35,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:13:35,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:13:35,261 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-19 05:13:35,261 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-19 05:13:35,262 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2023-11-19 05:13:35,262 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2023-11-19 05:13:35,262 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-19 05:13:35,262 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-19 05:13:35,263 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-19 05:13:35,263 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-19 05:13:35,263 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-19 05:13:35,263 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-19 05:13:35,263 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-19 05:13:35,264 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-19 05:13:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-19 05:13:35,264 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-19 05:13:35,264 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-19 05:13:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-19 05:13:35,265 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-19 05:13:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-19 05:13:35,265 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2023-11-19 05:13:35,265 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2023-11-19 05:13:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-19 05:13:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-19 05:13:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-19 05:13:35,266 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-19 05:13:35,266 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-19 05:13:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-19 05:13:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-19 05:13:35,267 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-19 05:13:35,267 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-19 05:13:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-19 05:13:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-19 05:13:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2023-11-19 05:13:35,268 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-19 05:13:35,268 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-19 05:13:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-19 05:13:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-19 05:13:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-19 05:13:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-19 05:13:35,269 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-19 05:13:35,269 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-19 05:13:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:13:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-19 05:13:35,270 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-19 05:13:35,270 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-19 05:13:35,270 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-19 05:13:35,271 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-19 05:13:35,271 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-19 05:13:35,271 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:13:35,271 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:13:35,271 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-19 05:13:35,272 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-19 05:13:35,272 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2023-11-19 05:13:35,272 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2023-11-19 05:13:35,438 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:13:35,443 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:13:36,967 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:13:37,972 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:13:37,973 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-19 05:13:37,988 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:13:37 BoogieIcfgContainer [2023-11-19 05:13:37,988 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:13:37,991 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:13:37,991 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:13:37,995 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:13:37,995 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:13:33" (1/3) ... [2023-11-19 05:13:37,996 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@569ad72e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:13:37, skipping insertion in model container [2023-11-19 05:13:37,996 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:13:34" (2/3) ... [2023-11-19 05:13:37,997 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@569ad72e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:13:37, skipping insertion in model container [2023-11-19 05:13:37,997 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:13:37" (3/3) ... [2023-11-19 05:13:37,998 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec14_product28.cil.c [2023-11-19 05:13:38,020 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:13:38,020 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:13:38,089 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:13:38,097 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;@20b32fb3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:13:38,097 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:13:38,105 INFO L276 IsEmpty]: Start isEmpty. Operand has 366 states, 242 states have (on average 1.56198347107438) internal successors, (378), 260 states have internal predecessors, (378), 97 states have call successors, (97), 25 states have call predecessors, (97), 25 states have return successors, (97), 94 states have call predecessors, (97), 97 states have call successors, (97) [2023-11-19 05:13:38,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 05:13:38,118 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:38,119 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:38,120 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:38,126 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:38,126 INFO L85 PathProgramCache]: Analyzing trace with hash -272036126, now seen corresponding path program 1 times [2023-11-19 05:13:38,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:38,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862042357] [2023-11-19 05:13:38,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:38,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:38,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:39,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:13:39,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:39,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862042357] [2023-11-19 05:13:39,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862042357] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:39,011 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:13:39,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:13:39,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632776188] [2023-11-19 05:13:39,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:39,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:13:39,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:39,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:13:39,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:13:39,061 INFO L87 Difference]: Start difference. First operand has 366 states, 242 states have (on average 1.56198347107438) internal successors, (378), 260 states have internal predecessors, (378), 97 states have call successors, (97), 25 states have call predecessors, (97), 25 states have return successors, (97), 94 states have call predecessors, (97), 97 states have call successors, (97) Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-11-19 05:13:39,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:39,543 INFO L93 Difference]: Finished difference Result 1074 states and 1705 transitions. [2023-11-19 05:13:39,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:13:39,549 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 43 [2023-11-19 05:13:39,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:39,585 INFO L225 Difference]: With dead ends: 1074 [2023-11-19 05:13:39,585 INFO L226 Difference]: Without dead ends: 709 [2023-11-19 05:13:39,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:13:39,605 INFO L413 NwaCegarLoop]: 602 mSDtfsCounter, 546 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 1111 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:39,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 1111 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:13:39,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2023-11-19 05:13:39,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 673. [2023-11-19 05:13:39,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 459 states have (on average 1.5642701525054465) internal successors, (718), 485 states have internal predecessors, (718), 170 states have call successors, (170), 45 states have call predecessors, (170), 43 states have return successors, (175), 157 states have call predecessors, (175), 168 states have call successors, (175) [2023-11-19 05:13:39,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 1063 transitions. [2023-11-19 05:13:39,854 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 1063 transitions. Word has length 43 [2023-11-19 05:13:39,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:39,855 INFO L495 AbstractCegarLoop]: Abstraction has 673 states and 1063 transitions. [2023-11-19 05:13:39,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2023-11-19 05:13:39,856 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 1063 transitions. [2023-11-19 05:13:39,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-19 05:13:39,877 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:39,877 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2023-11-19 05:13:39,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:13:39,878 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:39,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:39,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1418877088, now seen corresponding path program 1 times [2023-11-19 05:13:39,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:39,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681648611] [2023-11-19 05:13:39,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:39,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:39,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:40,661 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-19 05:13:40,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:40,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681648611] [2023-11-19 05:13:40,663 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681648611] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:40,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713195771] [2023-11-19 05:13:40,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:40,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:40,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:40,674 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:40,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:13:41,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:41,136 INFO L262 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:13:41,148 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:41,315 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 05:13:41,315 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:13:41,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713195771] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:41,321 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:13:41,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 11 [2023-11-19 05:13:41,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367234832] [2023-11-19 05:13:41,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:41,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:13:41,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:41,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:13:41,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:13:41,331 INFO L87 Difference]: Start difference. First operand 673 states and 1063 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2023-11-19 05:13:42,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:42,144 INFO L93 Difference]: Finished difference Result 1576 states and 2466 transitions. [2023-11-19 05:13:42,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:13:42,146 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 86 [2023-11-19 05:13:42,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:42,166 INFO L225 Difference]: With dead ends: 1576 [2023-11-19 05:13:42,166 INFO L226 Difference]: Without dead ends: 914 [2023-11-19 05:13:42,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:13:42,174 INFO L413 NwaCegarLoop]: 603 mSDtfsCounter, 375 mSDsluCounter, 1695 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 2298 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:42,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [380 Valid, 2298 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:13:42,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 914 states. [2023-11-19 05:13:42,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 914 to 900. [2023-11-19 05:13:42,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 900 states, 599 states have (on average 1.4974958263772955) internal successors, (897), 626 states have internal predecessors, (897), 231 states have call successors, (231), 69 states have call predecessors, (231), 69 states have return successors, (261), 218 states have call predecessors, (261), 227 states have call successors, (261) [2023-11-19 05:13:42,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1389 transitions. [2023-11-19 05:13:42,351 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1389 transitions. Word has length 86 [2023-11-19 05:13:42,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:42,351 INFO L495 AbstractCegarLoop]: Abstraction has 900 states and 1389 transitions. [2023-11-19 05:13:42,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 4 states have internal predecessors, (43), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2023-11-19 05:13:42,352 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1389 transitions. [2023-11-19 05:13:42,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-19 05:13:42,356 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:42,356 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2023-11-19 05:13:42,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:42,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:42,579 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:42,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:42,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1828741631, now seen corresponding path program 1 times [2023-11-19 05:13:42,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:42,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291301687] [2023-11-19 05:13:42,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:42,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:42,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:43,058 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:13:43,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:43,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291301687] [2023-11-19 05:13:43,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291301687] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:43,064 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:13:43,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 05:13:43,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348834506] [2023-11-19 05:13:43,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:43,066 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:13:43,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:43,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:13:43,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:13:43,069 INFO L87 Difference]: Start difference. First operand 900 states and 1389 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 5 states have call predecessors, (15), 4 states have call successors, (15) [2023-11-19 05:13:45,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:45,963 INFO L93 Difference]: Finished difference Result 2731 states and 4271 transitions. [2023-11-19 05:13:45,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:13:45,964 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 5 states have call predecessors, (15), 4 states have call successors, (15) Word has length 87 [2023-11-19 05:13:45,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:45,985 INFO L225 Difference]: With dead ends: 2731 [2023-11-19 05:13:45,985 INFO L226 Difference]: Without dead ends: 1844 [2023-11-19 05:13:45,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:13:46,000 INFO L413 NwaCegarLoop]: 306 mSDtfsCounter, 1092 mSDsluCounter, 921 mSDsCounter, 0 mSdLazyCounter, 2327 mSolverCounterSat, 441 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1183 SdHoareTripleChecker+Valid, 1227 SdHoareTripleChecker+Invalid, 2768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 441 IncrementalHoareTripleChecker+Valid, 2327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:46,003 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1183 Valid, 1227 Invalid, 2768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [441 Valid, 2327 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-11-19 05:13:46,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1844 states. [2023-11-19 05:13:46,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1844 to 1600. [2023-11-19 05:13:46,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 1079 states have (on average 1.5199258572752548) internal successors, (1640), 1129 states have internal predecessors, (1640), 397 states have call successors, (397), 121 states have call predecessors, (397), 123 states have return successors, (455), 376 states have call predecessors, (455), 391 states have call successors, (455) [2023-11-19 05:13:46,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 2492 transitions. [2023-11-19 05:13:46,192 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 2492 transitions. Word has length 87 [2023-11-19 05:13:46,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:46,193 INFO L495 AbstractCegarLoop]: Abstraction has 1600 states and 2492 transitions. [2023-11-19 05:13:46,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 7 states have internal predecessors, (43), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 5 states have call predecessors, (15), 4 states have call successors, (15) [2023-11-19 05:13:46,193 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 2492 transitions. [2023-11-19 05:13:46,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-11-19 05:13:46,199 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:46,199 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2023-11-19 05:13:46,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:13:46,200 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:46,200 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:46,200 INFO L85 PathProgramCache]: Analyzing trace with hash -1003174560, now seen corresponding path program 1 times [2023-11-19 05:13:46,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:46,201 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574323599] [2023-11-19 05:13:46,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:46,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:46,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:46,734 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-19 05:13:46,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:46,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574323599] [2023-11-19 05:13:46,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574323599] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:46,736 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:13:46,736 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-19 05:13:46,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477754847] [2023-11-19 05:13:46,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:46,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:13:46,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:46,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:13:46,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:13:46,739 INFO L87 Difference]: Start difference. First operand 1600 states and 2492 transitions. Second operand has 9 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 6 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-19 05:13:49,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:49,831 INFO L93 Difference]: Finished difference Result 1966 states and 3083 transitions. [2023-11-19 05:13:49,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-19 05:13:49,832 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 6 states have call predecessors, (16), 5 states have call successors, (16) Word has length 91 [2023-11-19 05:13:49,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:49,861 INFO L225 Difference]: With dead ends: 1966 [2023-11-19 05:13:49,861 INFO L226 Difference]: Without dead ends: 1964 [2023-11-19 05:13:49,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:13:49,870 INFO L413 NwaCegarLoop]: 441 mSDtfsCounter, 1377 mSDsluCounter, 1548 mSDsCounter, 0 mSdLazyCounter, 2968 mSolverCounterSat, 795 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1399 SdHoareTripleChecker+Valid, 1989 SdHoareTripleChecker+Invalid, 3763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 795 IncrementalHoareTripleChecker+Valid, 2968 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:49,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1399 Valid, 1989 Invalid, 3763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [795 Valid, 2968 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-11-19 05:13:49,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1964 states. [2023-11-19 05:13:50,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1964 to 1780. [2023-11-19 05:13:50,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1780 states, 1173 states have (on average 1.5089514066496164) internal successors, (1770), 1245 states have internal predecessors, (1770), 479 states have call successors, (479), 121 states have call predecessors, (479), 127 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:50,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1780 states to 1780 states and 2788 transitions. [2023-11-19 05:13:50,077 INFO L78 Accepts]: Start accepts. Automaton has 1780 states and 2788 transitions. Word has length 91 [2023-11-19 05:13:50,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:50,078 INFO L495 AbstractCegarLoop]: Abstraction has 1780 states and 2788 transitions. [2023-11-19 05:13:50,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 6 states have call predecessors, (16), 5 states have call successors, (16) [2023-11-19 05:13:50,079 INFO L276 IsEmpty]: Start isEmpty. Operand 1780 states and 2788 transitions. [2023-11-19 05:13:50,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2023-11-19 05:13:50,094 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:50,095 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:50,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:13:50,095 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:50,095 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:50,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1133102059, now seen corresponding path program 1 times [2023-11-19 05:13:50,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:50,096 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480018828] [2023-11-19 05:13:50,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:50,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:50,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:50,397 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2023-11-19 05:13:50,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:50,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480018828] [2023-11-19 05:13:50,398 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480018828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:50,398 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:13:50,398 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:13:50,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141955816] [2023-11-19 05:13:50,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:50,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:13:50,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:50,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:13:50,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:13:50,400 INFO L87 Difference]: Start difference. First operand 1780 states and 2788 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 1 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2023-11-19 05:13:50,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:50,745 INFO L93 Difference]: Finished difference Result 3646 states and 5774 transitions. [2023-11-19 05:13:50,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:13:50,746 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 1 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) Word has length 122 [2023-11-19 05:13:50,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:50,769 INFO L225 Difference]: With dead ends: 3646 [2023-11-19 05:13:50,769 INFO L226 Difference]: Without dead ends: 1878 [2023-11-19 05:13:50,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:13:50,788 INFO L413 NwaCegarLoop]: 528 mSDtfsCounter, 30 mSDsluCounter, 1035 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1563 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:50,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 1563 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:13:50,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1878 states. [2023-11-19 05:13:50,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1878 to 1792. [2023-11-19 05:13:50,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1792 states, 1185 states have (on average 1.5037974683544304) internal successors, (1782), 1257 states have internal predecessors, (1782), 479 states have call successors, (479), 121 states have call predecessors, (479), 127 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:50,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1792 states to 1792 states and 2800 transitions. [2023-11-19 05:13:50,982 INFO L78 Accepts]: Start accepts. Automaton has 1792 states and 2800 transitions. Word has length 122 [2023-11-19 05:13:50,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:50,982 INFO L495 AbstractCegarLoop]: Abstraction has 1792 states and 2800 transitions. [2023-11-19 05:13:50,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 1 states have call predecessors, (19), 2 states have return successors, (18), 2 states have call predecessors, (18), 2 states have call successors, (18) [2023-11-19 05:13:50,983 INFO L276 IsEmpty]: Start isEmpty. Operand 1792 states and 2800 transitions. [2023-11-19 05:13:50,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-11-19 05:13:50,988 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:50,989 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:50,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:13:50,989 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:50,990 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:50,990 INFO L85 PathProgramCache]: Analyzing trace with hash -2019268835, now seen corresponding path program 1 times [2023-11-19 05:13:50,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:50,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394365242] [2023-11-19 05:13:50,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:50,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:51,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:51,405 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-11-19 05:13:51,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:51,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394365242] [2023-11-19 05:13:51,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394365242] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:51,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931706498] [2023-11-19 05:13:51,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:51,407 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:51,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:51,409 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:51,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:13:51,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:51,826 INFO L262 TraceCheckSpWp]: Trace formula consists of 1498 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:13:51,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:51,879 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-11-19 05:13:51,882 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:13:51,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931706498] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:51,882 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:13:51,883 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2023-11-19 05:13:51,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028440682] [2023-11-19 05:13:51,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:51,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:13:51,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:51,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:13:51,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:13:51,886 INFO L87 Difference]: Start difference. First operand 1792 states and 2800 transitions. Second operand has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:52,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:52,317 INFO L93 Difference]: Finished difference Result 3728 states and 5948 transitions. [2023-11-19 05:13:52,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:13:52,318 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 125 [2023-11-19 05:13:52,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:52,336 INFO L225 Difference]: With dead ends: 3728 [2023-11-19 05:13:52,336 INFO L226 Difference]: Without dead ends: 1948 [2023-11-19 05:13:52,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:13:52,351 INFO L413 NwaCegarLoop]: 461 mSDtfsCounter, 213 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:52,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 1359 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:13:52,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1948 states. [2023-11-19 05:13:52,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1948 to 1948. [2023-11-19 05:13:52,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1948 states, 1337 states have (on average 1.5512341062079282) internal successors, (2074), 1409 states have internal predecessors, (2074), 479 states have call successors, (479), 125 states have call predecessors, (479), 131 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:52,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1948 states to 1948 states and 3092 transitions. [2023-11-19 05:13:52,545 INFO L78 Accepts]: Start accepts. Automaton has 1948 states and 3092 transitions. Word has length 125 [2023-11-19 05:13:52,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:52,546 INFO L495 AbstractCegarLoop]: Abstraction has 1948 states and 3092 transitions. [2023-11-19 05:13:52,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:52,547 INFO L276 IsEmpty]: Start isEmpty. Operand 1948 states and 3092 transitions. [2023-11-19 05:13:52,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-11-19 05:13:52,552 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:52,553 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 3, 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 05:13:52,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:52,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:52,784 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:52,784 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:52,784 INFO L85 PathProgramCache]: Analyzing trace with hash 361457891, now seen corresponding path program 1 times [2023-11-19 05:13:52,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:52,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789381349] [2023-11-19 05:13:52,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:52,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:52,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:52,996 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-11-19 05:13:52,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:52,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789381349] [2023-11-19 05:13:52,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789381349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:52,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239461568] [2023-11-19 05:13:52,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:52,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:52,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:52,998 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:53,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:13:53,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:53,335 INFO L262 TraceCheckSpWp]: Trace formula consists of 1503 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:13:53,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:53,372 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-19 05:13:53,373 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:13:53,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239461568] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:53,373 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:13:53,373 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-19 05:13:53,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626362123] [2023-11-19 05:13:53,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:53,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:13:53,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:53,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:13:53,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:13:53,377 INFO L87 Difference]: Start difference. First operand 1948 states and 3092 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:53,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:53,846 INFO L93 Difference]: Finished difference Result 4040 states and 6526 transitions. [2023-11-19 05:13:53,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:13:53,847 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 130 [2023-11-19 05:13:53,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:53,868 INFO L225 Difference]: With dead ends: 4040 [2023-11-19 05:13:53,868 INFO L226 Difference]: Without dead ends: 2104 [2023-11-19 05:13:53,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:13:53,884 INFO L413 NwaCegarLoop]: 461 mSDtfsCounter, 211 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:53,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [211 Valid, 1359 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:13:53,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2104 states. [2023-11-19 05:13:54,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2104 to 2104. [2023-11-19 05:13:54,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2104 states, 1489 states have (on average 1.5889858965748824) internal successors, (2366), 1561 states have internal predecessors, (2366), 479 states have call successors, (479), 129 states have call predecessors, (479), 135 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:54,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2104 states to 2104 states and 3384 transitions. [2023-11-19 05:13:54,105 INFO L78 Accepts]: Start accepts. Automaton has 2104 states and 3384 transitions. Word has length 130 [2023-11-19 05:13:54,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:54,106 INFO L495 AbstractCegarLoop]: Abstraction has 2104 states and 3384 transitions. [2023-11-19 05:13:54,106 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:54,106 INFO L276 IsEmpty]: Start isEmpty. Operand 2104 states and 3384 transitions. [2023-11-19 05:13:54,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-11-19 05:13:54,124 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:54,124 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 3, 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 05:13:54,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:54,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:54,347 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:54,347 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:54,347 INFO L85 PathProgramCache]: Analyzing trace with hash 829377555, now seen corresponding path program 1 times [2023-11-19 05:13:54,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:54,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961774655] [2023-11-19 05:13:54,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:54,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:54,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:54,583 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-11-19 05:13:54,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:54,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961774655] [2023-11-19 05:13:54,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961774655] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:54,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040739068] [2023-11-19 05:13:54,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:54,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:54,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:54,586 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:54,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:13:54,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:54,930 INFO L262 TraceCheckSpWp]: Trace formula consists of 1507 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:13:54,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:54,978 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-19 05:13:54,978 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:13:54,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040739068] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:54,979 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:13:54,979 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-19 05:13:54,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497654845] [2023-11-19 05:13:54,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:54,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:13:54,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:54,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:13:54,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:13:54,982 INFO L87 Difference]: Start difference. First operand 2104 states and 3384 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:55,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:55,434 INFO L93 Difference]: Finished difference Result 4352 states and 7104 transitions. [2023-11-19 05:13:55,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:13:55,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 134 [2023-11-19 05:13:55,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:55,483 INFO L225 Difference]: With dead ends: 4352 [2023-11-19 05:13:55,484 INFO L226 Difference]: Without dead ends: 2260 [2023-11-19 05:13:55,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:13:55,497 INFO L413 NwaCegarLoop]: 461 mSDtfsCounter, 209 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:55,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 1359 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:13:55,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2260 states. [2023-11-19 05:13:55,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2260 to 2260. [2023-11-19 05:13:55,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2260 states, 1641 states have (on average 1.6197440585009142) internal successors, (2658), 1713 states have internal predecessors, (2658), 479 states have call successors, (479), 133 states have call predecessors, (479), 139 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:55,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2260 states to 2260 states and 3676 transitions. [2023-11-19 05:13:55,667 INFO L78 Accepts]: Start accepts. Automaton has 2260 states and 3676 transitions. Word has length 134 [2023-11-19 05:13:55,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:55,669 INFO L495 AbstractCegarLoop]: Abstraction has 2260 states and 3676 transitions. [2023-11-19 05:13:55,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:55,670 INFO L276 IsEmpty]: Start isEmpty. Operand 2260 states and 3676 transitions. [2023-11-19 05:13:55,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-11-19 05:13:55,677 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:55,678 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:55,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:55,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:55,895 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:55,895 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:55,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1827085443, now seen corresponding path program 1 times [2023-11-19 05:13:55,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:55,896 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794827079] [2023-11-19 05:13:55,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:55,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:55,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:56,097 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-11-19 05:13:56,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:56,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794827079] [2023-11-19 05:13:56,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794827079] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:56,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912978087] [2023-11-19 05:13:56,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:56,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:56,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:56,100 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:56,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:13:56,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:56,452 INFO L262 TraceCheckSpWp]: Trace formula consists of 1510 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:13:56,471 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:13:56,520 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-19 05:13:56,522 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:13:56,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912978087] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:13:56,522 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:13:56,523 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-19 05:13:56,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320371921] [2023-11-19 05:13:56,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:13:56,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:13:56,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:13:56,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:13:56,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:13:56,525 INFO L87 Difference]: Start difference. First operand 2260 states and 3676 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:57,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:13:57,042 INFO L93 Difference]: Finished difference Result 4664 states and 7682 transitions. [2023-11-19 05:13:57,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:13:57,043 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) Word has length 137 [2023-11-19 05:13:57,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:13:57,068 INFO L225 Difference]: With dead ends: 4664 [2023-11-19 05:13:57,069 INFO L226 Difference]: Without dead ends: 2416 [2023-11-19 05:13:57,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:13:57,086 INFO L413 NwaCegarLoop]: 461 mSDtfsCounter, 207 mSDsluCounter, 898 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:13:57,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 1359 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:13:57,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2416 states. [2023-11-19 05:13:57,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2416 to 2416. [2023-11-19 05:13:57,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2416 states, 1793 states have (on average 1.645287228109314) internal successors, (2950), 1865 states have internal predecessors, (2950), 479 states have call successors, (479), 137 states have call predecessors, (479), 143 states have return successors, (539), 452 states have call predecessors, (539), 473 states have call successors, (539) [2023-11-19 05:13:57,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2416 states to 2416 states and 3968 transitions. [2023-11-19 05:13:57,296 INFO L78 Accepts]: Start accepts. Automaton has 2416 states and 3968 transitions. Word has length 137 [2023-11-19 05:13:57,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:13:57,297 INFO L495 AbstractCegarLoop]: Abstraction has 2416 states and 3968 transitions. [2023-11-19 05:13:57,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 2 states have call predecessors, (20), 2 states have call successors, (20) [2023-11-19 05:13:57,297 INFO L276 IsEmpty]: Start isEmpty. Operand 2416 states and 3968 transitions. [2023-11-19 05:13:57,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-11-19 05:13:57,305 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:13:57,305 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:13:57,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:13:57,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:57,519 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:13:57,519 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:13:57,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1256007083, now seen corresponding path program 1 times [2023-11-19 05:13:57,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:13:57,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675660487] [2023-11-19 05:13:57,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:57,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:13:57,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:57,849 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-11-19 05:13:57,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:13:57,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675660487] [2023-11-19 05:13:57,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675660487] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:13:57,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261702200] [2023-11-19 05:13:57,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:13:57,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:13:57,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:13:57,852 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:13:57,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_64de062b-e287-4de1-ad6b-cca6fbcd93f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:13:58,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:13:58,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 1506 conjuncts, 58 conjunts are in the unsatisfiable core [2023-11-19 05:13:58,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:14:00,272 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-11-19 05:14:00,273 INFO L327 TraceCheckSpWp]: Computing backward predicates...