./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a 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_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4f7f32f81229c7756ac3848f16abf37868e5b5283c2f5648c26317015a8240dd --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 12:37:03,586 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 12:37:03,702 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 12:37:03,710 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 12:37:03,710 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 12:37:03,741 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 12:37:03,742 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 12:37:03,742 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 12:37:03,743 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 12:37:03,744 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 12:37:03,746 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 12:37:03,746 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 12:37:03,747 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 12:37:03,747 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 12:37:03,747 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 12:37:03,748 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 12:37:03,748 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 12:37:03,748 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 12:37:03,749 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 12:37:03,750 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 12:37:03,750 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 12:37:03,755 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 12:37:03,756 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 12:37:03,756 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 12:37:03,756 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 12:37:03,756 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 12:37:03,757 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 12:37:03,757 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 12:37:03,757 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 12:37:03,757 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 12:37:03,758 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 12:37:03,758 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 12:37:03,758 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 12:37:03,758 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 12:37:03,759 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 12:37:03,761 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 12:37:03,761 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 12:37:03,761 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 12:37:03,762 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:37:03,763 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 12:37:03,763 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 12:37:03,763 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 12:37:03,764 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 12:37:03,764 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 12:37:03,765 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 12:37:03,765 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 12:37:03,765 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 12:37:03,766 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_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4f7f32f81229c7756ac3848f16abf37868e5b5283c2f5648c26317015a8240dd [2024-11-02 12:37:04,052 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 12:37:04,083 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 12:37:04,086 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 12:37:04,089 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 12:37:04,090 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 12:37:04,091 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c Unable to find full path for "g++" [2024-11-02 12:37:06,211 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 12:37:06,576 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 12:37:06,577 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c [2024-11-02 12:37:06,600 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/data/e32305621/b2c2b00797484deb91aeb42cfbf31a6c/FLAG2dbfdf83f [2024-11-02 12:37:06,617 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/data/e32305621/b2c2b00797484deb91aeb42cfbf31a6c [2024-11-02 12:37:06,620 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 12:37:06,622 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 12:37:06,623 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 12:37:06,623 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 12:37:06,629 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 12:37:06,630 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:37:06" (1/1) ... [2024-11-02 12:37:06,631 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b3ff764 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:06, skipping insertion in model container [2024-11-02 12:37:06,631 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:37:06" (1/1) ... [2024-11-02 12:37:06,716 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 12:37:07,435 WARN L251 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_3613c204-1186-40a3-92bf-39cb4e1a96a3/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c[73003,73016] [2024-11-02 12:37:07,442 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:37:07,459 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 12:37:07,470 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [48] [2024-11-02 12:37:07,472 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [1613] [2024-11-02 12:37:07,472 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [1707] [2024-11-02 12:37:07,473 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [1825] [2024-11-02 12:37:07,474 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [2012] [2024-11-02 12:37:07,474 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [2030] [2024-11-02 12:37:07,474 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2381] [2024-11-02 12:37:07,475 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [3042] [2024-11-02 12:37:07,475 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [3077] [2024-11-02 12:37:07,475 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [3443] [2024-11-02 12:37:07,691 WARN L251 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_3613c204-1186-40a3-92bf-39cb4e1a96a3/sv-benchmarks/c/product-lines/elevator_spec3_product27.cil.c[73003,73016] [2024-11-02 12:37:07,692 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:37:07,723 INFO L204 MainTranslator]: Completed translation [2024-11-02 12:37:07,723 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07 WrapperNode [2024-11-02 12:37:07,724 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 12:37:07,725 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 12:37:07,725 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 12:37:07,725 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 12:37:07,733 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,760 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,822 INFO L138 Inliner]: procedures = 93, calls = 348, calls flagged for inlining = 25, calls inlined = 22, statements flattened = 1134 [2024-11-02 12:37:07,823 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 12:37:07,823 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 12:37:07,824 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 12:37:07,824 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 12:37:07,834 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,835 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,847 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,848 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,874 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,899 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,911 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,923 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,937 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 12:37:07,943 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 12:37:07,943 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 12:37:07,943 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 12:37:07,944 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (1/1) ... [2024-11-02 12:37:07,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:37:07,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:07,986 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 12:37:07,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 12:37:08,024 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 12:37:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2024-11-02 12:37:08,025 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2024-11-02 12:37:08,025 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2024-11-02 12:37:08,026 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2024-11-02 12:37:08,026 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2024-11-02 12:37:08,026 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2024-11-02 12:37:08,027 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2024-11-02 12:37:08,027 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2024-11-02 12:37:08,027 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2024-11-02 12:37:08,028 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2024-11-02 12:37:08,028 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2024-11-02 12:37:08,029 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2024-11-02 12:37:08,029 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2024-11-02 12:37:08,029 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2024-11-02 12:37:08,029 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2024-11-02 12:37:08,030 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2024-11-02 12:37:08,030 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2024-11-02 12:37:08,030 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2024-11-02 12:37:08,032 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2024-11-02 12:37:08,032 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2024-11-02 12:37:08,033 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2024-11-02 12:37:08,033 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2024-11-02 12:37:08,033 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2024-11-02 12:37:08,033 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2024-11-02 12:37:08,033 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2024-11-02 12:37:08,033 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2024-11-02 12:37:08,033 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2024-11-02 12:37:08,033 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2024-11-02 12:37:08,033 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2024-11-02 12:37:08,034 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2024-11-02 12:37:08,034 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2024-11-02 12:37:08,034 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2024-11-02 12:37:08,034 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2024-11-02 12:37:08,034 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2024-11-02 12:37:08,034 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2024-11-02 12:37:08,034 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2024-11-02 12:37:08,034 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2024-11-02 12:37:08,034 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2024-11-02 12:37:08,035 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2024-11-02 12:37:08,035 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2024-11-02 12:37:08,035 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2024-11-02 12:37:08,035 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2024-11-02 12:37:08,035 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2024-11-02 12:37:08,035 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2024-11-02 12:37:08,035 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 12:37:08,035 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2024-11-02 12:37:08,035 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2024-11-02 12:37:08,036 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2024-11-02 12:37:08,036 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2024-11-02 12:37:08,037 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2024-11-02 12:37:08,038 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2024-11-02 12:37:08,038 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2024-11-02 12:37:08,038 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2024-11-02 12:37:08,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 12:37:08,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 12:37:08,038 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2024-11-02 12:37:08,039 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2024-11-02 12:37:08,216 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 12:37:08,218 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 12:37:09,874 INFO L? ?]: Removed 469 outVars from TransFormulas that were not future-live. [2024-11-02 12:37:09,874 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 12:37:10,904 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 12:37:10,905 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-02 12:37:10,905 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:37:10 BoogieIcfgContainer [2024-11-02 12:37:10,905 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 12:37:10,908 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 12:37:10,908 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 12:37:10,911 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 12:37:10,912 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:37:06" (1/3) ... [2024-11-02 12:37:10,912 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bdf689f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:37:10, skipping insertion in model container [2024-11-02 12:37:10,913 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:37:07" (2/3) ... [2024-11-02 12:37:10,913 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bdf689f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:37:10, skipping insertion in model container [2024-11-02 12:37:10,913 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:37:10" (3/3) ... [2024-11-02 12:37:10,915 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product27.cil.c [2024-11-02 12:37:10,935 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 12:37:10,936 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 12:37:11,047 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 12:37:11,056 INFO L333 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, 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;@61e098ec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 12:37:11,057 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 12:37:11,065 INFO L276 IsEmpty]: Start isEmpty. Operand has 410 states, 273 states have (on average 1.5677655677655677) internal successors, (428), 291 states have internal predecessors, (428), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2024-11-02 12:37:11,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-02 12:37:11,095 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:11,096 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:11,096 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:11,104 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:11,105 INFO L85 PathProgramCache]: Analyzing trace with hash 1614978727, now seen corresponding path program 1 times [2024-11-02 12:37:11,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:11,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516250008] [2024-11-02 12:37:11,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:11,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:11,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:12,445 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2024-11-02 12:37:12,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:12,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516250008] [2024-11-02 12:37:12,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516250008] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:12,447 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:37:12,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-02 12:37:12,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232918696] [2024-11-02 12:37:12,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:12,455 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-02 12:37:12,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:12,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-02 12:37:12,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2024-11-02 12:37:12,479 INFO L87 Difference]: Start difference. First operand has 410 states, 273 states have (on average 1.5677655677655677) internal successors, (428), 291 states have internal predecessors, (428), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2024-11-02 12:37:13,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:13,668 INFO L93 Difference]: Finished difference Result 1181 states and 1890 transitions. [2024-11-02 12:37:13,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:37:13,672 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2024-11-02 12:37:13,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:13,699 INFO L225 Difference]: With dead ends: 1181 [2024-11-02 12:37:13,699 INFO L226 Difference]: Without dead ends: 773 [2024-11-02 12:37:13,711 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2024-11-02 12:37:13,717 INFO L432 NwaCegarLoop]: 648 mSDtfsCounter, 590 mSDsluCounter, 2310 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 601 SdHoareTripleChecker+Valid, 2958 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:13,719 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [601 Valid, 2958 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-02 12:37:13,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2024-11-02 12:37:13,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 754. [2024-11-02 12:37:13,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 514 states have (on average 1.5603112840466926) internal successors, (802), 544 states have internal predecessors, (802), 193 states have call successors, (193), 49 states have call predecessors, (193), 46 states have return successors, (200), 180 states have call predecessors, (200), 189 states have call successors, (200) [2024-11-02 12:37:13,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1195 transitions. [2024-11-02 12:37:13,897 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1195 transitions. Word has length 88 [2024-11-02 12:37:13,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:13,898 INFO L471 AbstractCegarLoop]: Abstraction has 754 states and 1195 transitions. [2024-11-02 12:37:13,898 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2024-11-02 12:37:13,899 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1195 transitions. [2024-11-02 12:37:13,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2024-11-02 12:37:13,909 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:13,909 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:13,910 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 12:37:13,912 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:13,913 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:13,913 INFO L85 PathProgramCache]: Analyzing trace with hash 738329922, now seen corresponding path program 1 times [2024-11-02 12:37:13,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:13,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029970220] [2024-11-02 12:37:13,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:13,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:13,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:14,342 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:37:14,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:14,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029970220] [2024-11-02 12:37:14,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029970220] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:14,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293717506] [2024-11-02 12:37:14,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:14,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:14,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:14,346 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:14,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 12:37:14,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:14,803 INFO L255 TraceCheckSpWp]: Trace formula consists of 1548 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:37:14,815 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:15,026 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:37:15,030 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:15,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293717506] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:15,030 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:15,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2024-11-02 12:37:15,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388084042] [2024-11-02 12:37:15,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:15,035 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:37:15,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:15,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:37:15,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:15,036 INFO L87 Difference]: Start difference. First operand 754 states and 1195 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2024-11-02 12:37:15,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:15,421 INFO L93 Difference]: Finished difference Result 2138 states and 3454 transitions. [2024-11-02 12:37:15,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:37:15,422 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2024-11-02 12:37:15,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:15,435 INFO L225 Difference]: With dead ends: 2138 [2024-11-02 12:37:15,435 INFO L226 Difference]: Without dead ends: 1396 [2024-11-02 12:37:15,443 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:15,444 INFO L432 NwaCegarLoop]: 1022 mSDtfsCounter, 565 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 1526 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:15,445 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [565 Valid, 1526 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:37:15,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1396 states. [2024-11-02 12:37:15,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1396 to 1363. [2024-11-02 12:37:15,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1363 states, 936 states have (on average 1.5694444444444444) internal successors, (1469), 995 states have internal predecessors, (1469), 339 states have call successors, (339), 88 states have call predecessors, (339), 87 states have return successors, (366), 319 states have call predecessors, (366), 335 states have call successors, (366) [2024-11-02 12:37:15,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1363 states to 1363 states and 2174 transitions. [2024-11-02 12:37:15,589 INFO L78 Accepts]: Start accepts. Automaton has 1363 states and 2174 transitions. Word has length 87 [2024-11-02 12:37:15,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:15,591 INFO L471 AbstractCegarLoop]: Abstraction has 1363 states and 2174 transitions. [2024-11-02 12:37:15,591 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2024-11-02 12:37:15,592 INFO L276 IsEmpty]: Start isEmpty. Operand 1363 states and 2174 transitions. [2024-11-02 12:37:15,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2024-11-02 12:37:15,601 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:15,601 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:15,635 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 12:37:15,802 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:15,803 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:15,803 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:15,803 INFO L85 PathProgramCache]: Analyzing trace with hash -1912986910, now seen corresponding path program 1 times [2024-11-02 12:37:15,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:15,804 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156429189] [2024-11-02 12:37:15,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:15,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:15,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:16,301 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:37:16,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:16,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156429189] [2024-11-02 12:37:16,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156429189] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:16,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397984302] [2024-11-02 12:37:16,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:16,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:16,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:16,308 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:16,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 12:37:16,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:16,806 INFO L255 TraceCheckSpWp]: Trace formula consists of 1559 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:37:16,819 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-11-02 12:37:16,848 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:16,848 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397984302] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:16,849 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:16,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2024-11-02 12:37:16,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509632684] [2024-11-02 12:37:16,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:16,850 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:37:16,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:16,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:37:16,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:16,851 INFO L87 Difference]: Start difference. First operand 1363 states and 2174 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2024-11-02 12:37:17,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:17,121 INFO L93 Difference]: Finished difference Result 2744 states and 4421 transitions. [2024-11-02 12:37:17,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:37:17,122 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 89 [2024-11-02 12:37:17,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:17,132 INFO L225 Difference]: With dead ends: 2744 [2024-11-02 12:37:17,132 INFO L226 Difference]: Without dead ends: 1393 [2024-11-02 12:37:17,144 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:17,145 INFO L432 NwaCegarLoop]: 602 mSDtfsCounter, 17 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 1168 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:17,145 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 1168 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:37:17,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1393 states. [2024-11-02 12:37:17,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1393 to 1391. [2024-11-02 12:37:17,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1391 states, 960 states have (on average 1.559375) internal successors, (1497), 1019 states have internal predecessors, (1497), 343 states have call successors, (343), 88 states have call predecessors, (343), 87 states have return successors, (370), 323 states have call predecessors, (370), 339 states have call successors, (370) [2024-11-02 12:37:17,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1391 states to 1391 states and 2210 transitions. [2024-11-02 12:37:17,265 INFO L78 Accepts]: Start accepts. Automaton has 1391 states and 2210 transitions. Word has length 89 [2024-11-02 12:37:17,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:17,266 INFO L471 AbstractCegarLoop]: Abstraction has 1391 states and 2210 transitions. [2024-11-02 12:37:17,266 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2024-11-02 12:37:17,267 INFO L276 IsEmpty]: Start isEmpty. Operand 1391 states and 2210 transitions. [2024-11-02 12:37:17,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-02 12:37:17,270 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:17,270 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:17,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-02 12:37:17,474 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:17,475 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:17,476 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:17,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1638922587, now seen corresponding path program 1 times [2024-11-02 12:37:17,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:17,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162141712] [2024-11-02 12:37:17,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:17,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:17,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:17,863 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:37:17,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:17,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162141712] [2024-11-02 12:37:17,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162141712] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:17,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078877951] [2024-11-02 12:37:17,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:17,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:17,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:17,869 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:17,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 12:37:18,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:18,315 INFO L255 TraceCheckSpWp]: Trace formula consists of 1549 conjuncts, 2 conjuncts are in the unsatisfiable core [2024-11-02 12:37:18,320 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:18,429 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-02 12:37:18,429 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:18,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078877951] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:18,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:18,430 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2024-11-02 12:37:18,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379846356] [2024-11-02 12:37:18,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:18,431 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:37:18,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:18,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:37:18,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:18,432 INFO L87 Difference]: Start difference. First operand 1391 states and 2210 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2024-11-02 12:37:18,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:18,745 INFO L93 Difference]: Finished difference Result 3412 states and 5496 transitions. [2024-11-02 12:37:18,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:37:18,746 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 88 [2024-11-02 12:37:18,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:18,763 INFO L225 Difference]: With dead ends: 3412 [2024-11-02 12:37:18,763 INFO L226 Difference]: Without dead ends: 2033 [2024-11-02 12:37:18,773 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 12:37:18,774 INFO L432 NwaCegarLoop]: 1067 mSDtfsCounter, 564 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1572 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:18,775 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1572 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:37:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2033 states. [2024-11-02 12:37:18,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2033 to 1988. [2024-11-02 12:37:18,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1988 states, 1376 states have (on average 1.565406976744186) internal successors, (2154), 1464 states have internal predecessors, (2154), 486 states have call successors, (486), 124 states have call predecessors, (486), 125 states have return successors, (533), 459 states have call predecessors, (533), 482 states have call successors, (533) [2024-11-02 12:37:18,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1988 states to 1988 states and 3173 transitions. [2024-11-02 12:37:18,955 INFO L78 Accepts]: Start accepts. Automaton has 1988 states and 3173 transitions. Word has length 88 [2024-11-02 12:37:18,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:18,956 INFO L471 AbstractCegarLoop]: Abstraction has 1988 states and 3173 transitions. [2024-11-02 12:37:18,956 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2024-11-02 12:37:18,957 INFO L276 IsEmpty]: Start isEmpty. Operand 1988 states and 3173 transitions. [2024-11-02 12:37:18,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2024-11-02 12:37:18,962 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:18,962 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:18,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-02 12:37:19,162 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:19,163 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:19,164 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:19,164 INFO L85 PathProgramCache]: Analyzing trace with hash -762184278, now seen corresponding path program 1 times [2024-11-02 12:37:19,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:19,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430444581] [2024-11-02 12:37:19,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:19,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:19,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:19,532 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-11-02 12:37:19,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:19,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430444581] [2024-11-02 12:37:19,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430444581] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:19,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734504802] [2024-11-02 12:37:19,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:19,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:19,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:19,537 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:19,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 12:37:19,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:19,994 INFO L255 TraceCheckSpWp]: Trace formula consists of 1560 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-02 12:37:19,999 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:20,133 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-11-02 12:37:20,134 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:20,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734504802] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:20,134 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:20,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2024-11-02 12:37:20,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458124778] [2024-11-02 12:37:20,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:20,136 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-02 12:37:20,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:20,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-02 12:37:20,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2024-11-02 12:37:20,138 INFO L87 Difference]: Start difference. First operand 1988 states and 3173 transitions. Second operand has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-02 12:37:21,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:21,488 INFO L93 Difference]: Finished difference Result 5291 states and 8553 transitions. [2024-11-02 12:37:21,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:37:21,489 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 89 [2024-11-02 12:37:21,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:21,518 INFO L225 Difference]: With dead ends: 5291 [2024-11-02 12:37:21,518 INFO L226 Difference]: Without dead ends: 3315 [2024-11-02 12:37:21,542 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2024-11-02 12:37:21,543 INFO L432 NwaCegarLoop]: 608 mSDtfsCounter, 513 mSDsluCounter, 2124 mSDsCounter, 0 mSdLazyCounter, 690 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 2732 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:21,543 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [517 Valid, 2732 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 690 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-02 12:37:21,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3315 states. [2024-11-02 12:37:21,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3315 to 3282. [2024-11-02 12:37:21,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3282 states, 2263 states have (on average 1.5081749889527176) internal successors, (3413), 2412 states have internal predecessors, (3413), 803 states have call successors, (803), 220 states have call predecessors, (803), 215 states have return successors, (906), 745 states have call predecessors, (906), 797 states have call successors, (906) [2024-11-02 12:37:21,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3282 states to 3282 states and 5122 transitions. [2024-11-02 12:37:21,820 INFO L78 Accepts]: Start accepts. Automaton has 3282 states and 5122 transitions. Word has length 89 [2024-11-02 12:37:21,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:21,821 INFO L471 AbstractCegarLoop]: Abstraction has 3282 states and 5122 transitions. [2024-11-02 12:37:21,821 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2024-11-02 12:37:21,821 INFO L276 IsEmpty]: Start isEmpty. Operand 3282 states and 5122 transitions. [2024-11-02 12:37:21,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2024-11-02 12:37:21,825 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:21,825 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:21,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-02 12:37:22,025 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:22,026 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:22,026 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:22,027 INFO L85 PathProgramCache]: Analyzing trace with hash 415126757, now seen corresponding path program 1 times [2024-11-02 12:37:22,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:22,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974957933] [2024-11-02 12:37:22,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:22,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:22,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2024-11-02 12:37:22,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:22,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974957933] [2024-11-02 12:37:22,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974957933] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:22,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476805325] [2024-11-02 12:37:22,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:22,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:22,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:22,831 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:22,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 12:37:23,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:23,271 INFO L255 TraceCheckSpWp]: Trace formula consists of 1572 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-02 12:37:23,276 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:23,606 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:37:23,606 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:23,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476805325] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:23,606 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:23,606 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 15 [2024-11-02 12:37:23,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402263350] [2024-11-02 12:37:23,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:23,607 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-02 12:37:23,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:23,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-02 12:37:23,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2024-11-02 12:37:23,609 INFO L87 Difference]: Start difference. First operand 3282 states and 5122 transitions. Second operand has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2024-11-02 12:37:25,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:25,760 INFO L93 Difference]: Finished difference Result 6903 states and 10769 transitions. [2024-11-02 12:37:25,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 12:37:25,763 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 94 [2024-11-02 12:37:25,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:25,796 INFO L225 Difference]: With dead ends: 6903 [2024-11-02 12:37:25,796 INFO L226 Difference]: Without dead ends: 3633 [2024-11-02 12:37:25,823 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2024-11-02 12:37:25,824 INFO L432 NwaCegarLoop]: 612 mSDtfsCounter, 1078 mSDsluCounter, 1338 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1080 SdHoareTripleChecker+Valid, 1950 SdHoareTripleChecker+Invalid, 1296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:25,825 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1080 Valid, 1950 Invalid, 1296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2024-11-02 12:37:25,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3633 states. [2024-11-02 12:37:26,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3633 to 3622. [2024-11-02 12:37:26,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3622 states, 2519 states have (on average 1.4890829694323144) internal successors, (3751), 2676 states have internal predecessors, (3751), 863 states have call successors, (863), 248 states have call predecessors, (863), 239 states have return successors, (968), 793 states have call predecessors, (968), 857 states have call successors, (968) [2024-11-02 12:37:26,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3622 states to 3622 states and 5582 transitions. [2024-11-02 12:37:26,137 INFO L78 Accepts]: Start accepts. Automaton has 3622 states and 5582 transitions. Word has length 94 [2024-11-02 12:37:26,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:26,138 INFO L471 AbstractCegarLoop]: Abstraction has 3622 states and 5582 transitions. [2024-11-02 12:37:26,138 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2024-11-02 12:37:26,139 INFO L276 IsEmpty]: Start isEmpty. Operand 3622 states and 5582 transitions. [2024-11-02 12:37:26,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2024-11-02 12:37:26,141 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:26,142 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:26,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-02 12:37:26,346 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:26,347 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:26,347 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:26,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1872637808, now seen corresponding path program 1 times [2024-11-02 12:37:26,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:26,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652614062] [2024-11-02 12:37:26,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:26,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:26,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:27,068 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2024-11-02 12:37:27,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:27,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652614062] [2024-11-02 12:37:27,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652614062] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:27,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523310228] [2024-11-02 12:37:27,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:27,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:27,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:27,070 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:27,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 12:37:27,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:27,506 INFO L255 TraceCheckSpWp]: Trace formula consists of 1586 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 12:37:27,511 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:27,584 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-02 12:37:27,584 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 12:37:27,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523310228] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:37:27,584 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 12:37:27,585 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2024-11-02 12:37:27,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454030246] [2024-11-02 12:37:27,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:27,586 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-02 12:37:27,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:27,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-02 12:37:27,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2024-11-02 12:37:27,588 INFO L87 Difference]: Start difference. First operand 3622 states and 5582 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2024-11-02 12:37:28,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:37:28,028 INFO L93 Difference]: Finished difference Result 6453 states and 9971 transitions. [2024-11-02 12:37:28,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-02 12:37:28,028 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 99 [2024-11-02 12:37:28,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:37:28,060 INFO L225 Difference]: With dead ends: 6453 [2024-11-02 12:37:28,061 INFO L226 Difference]: Without dead ends: 3672 [2024-11-02 12:37:28,080 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2024-11-02 12:37:28,082 INFO L432 NwaCegarLoop]: 592 mSDtfsCounter, 0 mSDsluCounter, 2362 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 2954 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 12:37:28,083 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 2954 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 12:37:28,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3672 states. [2024-11-02 12:37:28,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3672 to 3672. [2024-11-02 12:37:28,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3672 states, 2559 states have (on average 1.4814380617428684) internal successors, (3791), 2716 states have internal predecessors, (3791), 863 states have call successors, (863), 248 states have call predecessors, (863), 249 states have return successors, (988), 803 states have call predecessors, (988), 857 states have call successors, (988) [2024-11-02 12:37:28,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3672 states to 3672 states and 5642 transitions. [2024-11-02 12:37:28,389 INFO L78 Accepts]: Start accepts. Automaton has 3672 states and 5642 transitions. Word has length 99 [2024-11-02 12:37:28,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:37:28,390 INFO L471 AbstractCegarLoop]: Abstraction has 3672 states and 5642 transitions. [2024-11-02 12:37:28,390 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2024-11-02 12:37:28,390 INFO L276 IsEmpty]: Start isEmpty. Operand 3672 states and 5642 transitions. [2024-11-02 12:37:28,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-11-02 12:37:28,393 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:37:28,393 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:37:28,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-02 12:37:28,597 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:28,598 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:37:28,598 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:37:28,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1939475410, now seen corresponding path program 1 times [2024-11-02 12:37:28,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:37:28,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614839063] [2024-11-02 12:37:28,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:28,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:37:28,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:29,496 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2024-11-02 12:37:29,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:37:29,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614839063] [2024-11-02 12:37:29,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614839063] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:29,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045211552] [2024-11-02 12:37:29,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:37:29,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:37:29,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:37:29,500 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:37:29,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3613c204-1186-40a3-92bf-39cb4e1a96a3/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 12:37:29,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:37:29,978 INFO L255 TraceCheckSpWp]: Trace formula consists of 1593 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-02 12:37:29,983 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:37:30,323 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-02 12:37:30,324 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:37:30,703 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-02 12:37:30,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045211552] provided 1 perfect and 1 imperfect interpolant sequences [2024-11-02 12:37:30,704 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2024-11-02 12:37:30,704 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2024-11-02 12:37:30,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596141942] [2024-11-02 12:37:30,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:37:30,705 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-11-02 12:37:30,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:37:30,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-11-02 12:37:30,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2024-11-02 12:37:30,707 INFO L87 Difference]: Start difference. First operand 3672 states and 5642 transitions. Second operand has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19)