./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91 --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 4eb5ae4a2b95fd78cf87e688565203c0839d6de752e442a1cce7638954224909 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:57:35,349 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:57:35,445 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:57:35,452 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:57:35,452 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:57:35,482 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:57:35,482 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:57:35,483 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:57:35,484 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:57:35,485 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:57:35,485 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:57:35,486 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:57:35,487 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:57:35,487 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:57:35,488 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:57:35,488 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:57:35,489 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:57:35,489 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:57:35,490 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:57:35,490 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:57:35,491 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:57:35,492 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:57:35,492 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:57:35,493 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:57:35,493 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:57:35,494 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:57:35,494 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:57:35,495 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:57:35,495 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:57:35,495 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:57:35,496 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:57:35,496 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:57:35,497 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:57:35,497 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:57:35,498 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:57:35,498 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:57:35,498 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:57:35,499 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:57:35,499 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:57:35,500 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:57:35,510 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:57:35,511 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:57:35,511 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:57:35,511 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:57:35,512 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:57:35,512 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:57:35,512 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:57:35,513 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_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4eb5ae4a2b95fd78cf87e688565203c0839d6de752e442a1cce7638954224909 [2023-11-24 23:57:35,838 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:57:35,877 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:57:35,880 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:57:35,883 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:57:35,883 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:57:35,885 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c [2023-11-24 23:57:39,110 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:57:39,533 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:57:39,535 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c [2023-11-24 23:57:39,567 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/data/d6775ded7/2dc90b50e54342e7beada87366b1c4ba/FLAG0f2e19129 [2023-11-24 23:57:39,589 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/data/d6775ded7/2dc90b50e54342e7beada87366b1c4ba [2023-11-24 23:57:39,596 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:57:39,599 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:57:39,603 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:57:39,603 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:57:39,609 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:57:39,612 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:57:39" (1/1) ... [2023-11-24 23:57:39,614 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c1a11ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:39, skipping insertion in model container [2023-11-24 23:57:39,614 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:57:39" (1/1) ... [2023-11-24 23:57:39,711 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:57:40,236 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c[55726,55739] [2023-11-24 23:57:40,271 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:57:40,285 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:57:40,296 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [48] [2023-11-24 23:57:40,298 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [408] [2023-11-24 23:57:40,299 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [423] [2023-11-24 23:57:40,299 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [789] [2023-11-24 23:57:40,299 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [2329] [2023-11-24 23:57:40,300 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2447] [2023-11-24 23:57:40,300 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [2482] [2023-11-24 23:57:40,300 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [2669] [2023-11-24 23:57:40,301 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [2678] [2023-11-24 23:57:40,301 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2769] [2023-11-24 23:57:40,402 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/sv-benchmarks/c/product-lines/elevator_spec3_product19.cil.c[55726,55739] [2023-11-24 23:57:40,421 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:57:40,454 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:57:40,455 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40 WrapperNode [2023-11-24 23:57:40,455 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:57:40,456 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:57:40,457 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:57:40,457 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:57:40,464 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,508 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,635 INFO L138 Inliner]: procedures = 92, calls = 346, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1090 [2023-11-24 23:57:40,636 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:57:40,636 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:57:40,637 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:57:40,637 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:57:40,647 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,647 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,653 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,654 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,680 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,696 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,702 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,708 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,718 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:57:40,719 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:57:40,719 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:57:40,720 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:57:40,721 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (1/1) ... [2023-11-24 23:57:40,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:57:40,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:40,776 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:57:40,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:57:40,841 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:57:40,842 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-24 23:57:40,842 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-24 23:57:40,842 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-24 23:57:40,843 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-24 23:57:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__weight [2023-11-24 23:57:40,844 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__weight [2023-11-24 23:57:40,844 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-24 23:57:40,844 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-24 23:57:40,845 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-24 23:57:40,845 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-24 23:57:40,846 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-24 23:57:40,848 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-24 23:57:40,848 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-24 23:57:40,848 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-24 23:57:40,849 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-24 23:57:40,851 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-24 23:57:40,852 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-24 23:57:40,852 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-24 23:57:40,853 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-24 23:57:40,853 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-24 23:57:40,854 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-24 23:57:40,855 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-24 23:57:40,855 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-24 23:57:40,855 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-24 23:57:40,856 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-24 23:57:40,856 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-24 23:57:40,857 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-24 23:57:40,857 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-24 23:57:40,861 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-24 23:57:40,862 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-24 23:57:40,862 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-24 23:57:40,862 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-24 23:57:40,862 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-24 23:57:40,862 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-24 23:57:40,863 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-24 23:57:40,863 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-24 23:57:40,863 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-24 23:57:40,863 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-24 23:57:40,863 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-24 23:57:40,864 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-24 23:57:40,864 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-24 23:57:40,864 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-24 23:57:40,864 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-24 23:57:40,864 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-24 23:57:40,865 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:57:40,865 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-24 23:57:40,865 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-24 23:57:40,866 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-24 23:57:40,867 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-24 23:57:40,867 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-24 23:57:40,868 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-24 23:57:40,868 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-24 23:57:40,868 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-24 23:57:40,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:57:40,869 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:57:40,869 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-24 23:57:40,869 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-24 23:57:41,100 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:57:41,105 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:57:42,447 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:57:43,317 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:57:43,318 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-24 23:57:43,320 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:57:43 BoogieIcfgContainer [2023-11-24 23:57:43,320 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:57:43,326 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:57:43,326 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:57:43,330 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:57:43,330 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:57:39" (1/3) ... [2023-11-24 23:57:43,331 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a5eed8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:57:43, skipping insertion in model container [2023-11-24 23:57:43,331 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:57:40" (2/3) ... [2023-11-24 23:57:43,333 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a5eed8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:57:43, skipping insertion in model container [2023-11-24 23:57:43,333 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:57:43" (3/3) ... [2023-11-24 23:57:43,335 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product19.cil.c [2023-11-24 23:57:43,366 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:57:43,366 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:57:43,452 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:57:43,460 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1ee5aa69, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:57:43,461 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:57:43,471 INFO L276 IsEmpty]: Start isEmpty. Operand has 410 states, 273 states have (on average 1.5677655677655677) internal successors, (428), 291 states have internal predecessors, (428), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-24 23:57:43,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-24 23:57:43,509 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:43,510 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:43,511 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:43,519 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:43,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1886615087, now seen corresponding path program 1 times [2023-11-24 23:57:43,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:43,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604299304] [2023-11-24 23:57:43,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:43,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:43,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:44,760 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:57:44,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:44,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604299304] [2023-11-24 23:57:44,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604299304] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:44,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557659733] [2023-11-24 23:57:44,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:44,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:44,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:44,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:44,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:57:45,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:45,225 INFO L262 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:57:45,240 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:45,389 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:57:45,391 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:45,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557659733] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:45,392 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:45,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-24 23:57:45,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695643913] [2023-11-24 23:57:45,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:45,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:45,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:45,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:45,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:45,449 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 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-24 23:57:45,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:45,848 INFO L93 Difference]: Finished difference Result 1153 states and 1836 transitions. [2023-11-24 23:57:45,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:45,855 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, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2023-11-24 23:57:45,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:45,893 INFO L225 Difference]: With dead ends: 1153 [2023-11-24 23:57:45,893 INFO L226 Difference]: Without dead ends: 745 [2023-11-24 23:57:45,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:45,917 INFO L413 NwaCegarLoop]: 627 mSDtfsCounter, 513 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 513 SdHoareTripleChecker+Valid, 1209 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:45,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [513 Valid, 1209 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:57:45,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2023-11-24 23:57:46,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 733. [2023-11-24 23:57:46,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 733 states, 493 states have (on average 1.5598377281947262) internal successors, (769), 524 states have internal predecessors, (769), 191 states have call successors, (191), 49 states have call predecessors, (191), 48 states have return successors, (193), 185 states have call predecessors, (193), 188 states have call successors, (193) [2023-11-24 23:57:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 1153 transitions. [2023-11-24 23:57:46,059 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 1153 transitions. Word has length 88 [2023-11-24 23:57:46,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:46,060 INFO L495 AbstractCegarLoop]: Abstraction has 733 states and 1153 transitions. [2023-11-24 23:57:46,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-24 23:57:46,060 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 1153 transitions. [2023-11-24 23:57:46,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-24 23:57:46,068 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:46,068 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:46,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:46,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-24 23:57:46,277 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:46,277 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:46,278 INFO L85 PathProgramCache]: Analyzing trace with hash -2040479862, now seen corresponding path program 1 times [2023-11-24 23:57:46,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:46,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055704240] [2023-11-24 23:57:46,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:46,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:46,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:46,694 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:57:46,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:46,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055704240] [2023-11-24 23:57:46,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055704240] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:46,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91060089] [2023-11-24 23:57:46,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:46,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:46,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:46,699 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:46,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:57:47,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:47,155 INFO L262 TraceCheckSpWp]: Trace formula consists of 1575 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:57:47,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:47,278 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:57:47,278 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:47,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91060089] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:47,278 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:47,279 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-24 23:57:47,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646891499] [2023-11-24 23:57:47,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:47,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:47,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:47,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:47,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:47,282 INFO L87 Difference]: Start difference. First operand 733 states and 1153 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-24 23:57:47,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:47,542 INFO L93 Difference]: Finished difference Result 1795 states and 2854 transitions. [2023-11-24 23:57:47,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:47,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2023-11-24 23:57:47,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:47,561 INFO L225 Difference]: With dead ends: 1795 [2023-11-24 23:57:47,561 INFO L226 Difference]: Without dead ends: 1074 [2023-11-24 23:57:47,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:47,569 INFO L413 NwaCegarLoop]: 594 mSDtfsCounter, 566 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 1098 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:47,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [566 Valid, 1098 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:57:47,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1074 states. [2023-11-24 23:57:47,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1074 to 1050. [2023-11-24 23:57:47,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1050 states, 710 states have (on average 1.5676056338028168) internal successors, (1113), 756 states have internal predecessors, (1113), 271 states have call successors, (271), 68 states have call predecessors, (271), 68 states have return successors, (278), 264 states have call predecessors, (278), 268 states have call successors, (278) [2023-11-24 23:57:47,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1050 states to 1050 states and 1662 transitions. [2023-11-24 23:57:47,695 INFO L78 Accepts]: Start accepts. Automaton has 1050 states and 1662 transitions. Word has length 87 [2023-11-24 23:57:47,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:47,696 INFO L495 AbstractCegarLoop]: Abstraction has 1050 states and 1662 transitions. [2023-11-24 23:57:47,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-24 23:57:47,696 INFO L276 IsEmpty]: Start isEmpty. Operand 1050 states and 1662 transitions. [2023-11-24 23:57:47,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-24 23:57:47,702 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:47,702 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:47,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:47,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:47,910 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:47,911 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:47,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1593792963, now seen corresponding path program 1 times [2023-11-24 23:57:47,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:47,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123665454] [2023-11-24 23:57:47,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:47,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:47,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:48,430 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:57:48,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:48,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123665454] [2023-11-24 23:57:48,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123665454] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:48,431 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:57:48,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-24 23:57:48,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575251964] [2023-11-24 23:57:48,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:48,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:57:48,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:48,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:57:48,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:57:48,434 INFO L87 Difference]: Start difference. First operand 1050 states and 1662 transitions. Second operand has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-24 23:57:49,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:49,333 INFO L93 Difference]: Finished difference Result 3089 states and 4960 transitions. [2023-11-24 23:57:49,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:57:49,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2023-11-24 23:57:49,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:49,350 INFO L225 Difference]: With dead ends: 3089 [2023-11-24 23:57:49,350 INFO L226 Difference]: Without dead ends: 2051 [2023-11-24 23:57:49,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:57:49,360 INFO L413 NwaCegarLoop]: 656 mSDtfsCounter, 627 mSDsluCounter, 2330 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 642 SdHoareTripleChecker+Valid, 2986 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:49,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [642 Valid, 2986 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:57:49,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2051 states. [2023-11-24 23:57:49,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2051 to 1960. [2023-11-24 23:57:49,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1960 states, 1352 states have (on average 1.5754437869822486) internal successors, (2130), 1440 states have internal predecessors, (2130), 482 states have call successors, (482), 124 states have call predecessors, (482), 125 states have return successors, (529), 455 states have call predecessors, (529), 478 states have call successors, (529) [2023-11-24 23:57:49,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1960 states to 1960 states and 3141 transitions. [2023-11-24 23:57:49,515 INFO L78 Accepts]: Start accepts. Automaton has 1960 states and 3141 transitions. Word has length 88 [2023-11-24 23:57:49,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:49,516 INFO L495 AbstractCegarLoop]: Abstraction has 1960 states and 3141 transitions. [2023-11-24 23:57:49,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2023-11-24 23:57:49,516 INFO L276 IsEmpty]: Start isEmpty. Operand 1960 states and 3141 transitions. [2023-11-24 23:57:49,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-24 23:57:49,521 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:49,521 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:49,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 23:57:49,522 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:49,522 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:49,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1418943002, now seen corresponding path program 1 times [2023-11-24 23:57:49,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:49,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629649462] [2023-11-24 23:57:49,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:49,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:49,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:49,871 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:57:49,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:49,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629649462] [2023-11-24 23:57:49,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629649462] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:49,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732121917] [2023-11-24 23:57:49,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:49,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:49,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:49,880 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:49,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:57:50,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:50,283 INFO L262 TraceCheckSpWp]: Trace formula consists of 1588 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-24 23:57:50,289 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:50,418 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-24 23:57:50,418 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:50,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732121917] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:50,419 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:50,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-11-24 23:57:50,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437503775] [2023-11-24 23:57:50,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:50,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:57:50,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:50,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:57:50,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:57:50,422 INFO L87 Difference]: Start difference. First operand 1960 states and 3141 transitions. Second operand has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-24 23:57:51,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:51,515 INFO L93 Difference]: Finished difference Result 5289 states and 8589 transitions. [2023-11-24 23:57:51,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 23:57:51,516 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 89 [2023-11-24 23:57:51,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:51,544 INFO L225 Difference]: With dead ends: 5289 [2023-11-24 23:57:51,545 INFO L226 Difference]: Without dead ends: 3341 [2023-11-24 23:57:51,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-24 23:57:51,570 INFO L413 NwaCegarLoop]: 613 mSDtfsCounter, 525 mSDsluCounter, 1979 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 530 SdHoareTripleChecker+Valid, 2592 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:51,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [530 Valid, 2592 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-24 23:57:51,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3341 states. [2023-11-24 23:57:51,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3341 to 3307. [2023-11-24 23:57:51,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3307 states, 2276 states have (on average 1.5118629173989455) internal successors, (3441), 2424 states have internal predecessors, (3441), 809 states have call successors, (809), 224 states have call predecessors, (809), 221 states have return successors, (939), 754 states have call predecessors, (939), 803 states have call successors, (939) [2023-11-24 23:57:51,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3307 states to 3307 states and 5189 transitions. [2023-11-24 23:57:51,801 INFO L78 Accepts]: Start accepts. Automaton has 3307 states and 5189 transitions. Word has length 89 [2023-11-24 23:57:51,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:51,802 INFO L495 AbstractCegarLoop]: Abstraction has 3307 states and 5189 transitions. [2023-11-24 23:57:51,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.8) internal successors, (49), 5 states have internal predecessors, (49), 4 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2023-11-24 23:57:51,802 INFO L276 IsEmpty]: Start isEmpty. Operand 3307 states and 5189 transitions. [2023-11-24 23:57:51,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-24 23:57:51,805 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:51,805 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:51,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:52,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:52,015 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:52,016 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:52,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1395165163, now seen corresponding path program 1 times [2023-11-24 23:57:52,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:52,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203680950] [2023-11-24 23:57:52,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:52,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:52,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:57:52,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:52,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203680950] [2023-11-24 23:57:52,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203680950] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:52,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856506236] [2023-11-24 23:57:52,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:52,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:52,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:52,395 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:52,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:57:52,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:52,787 INFO L262 TraceCheckSpWp]: Trace formula consists of 1576 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:57:52,793 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:52,893 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-24 23:57:52,893 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:52,893 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856506236] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:52,893 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:52,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-24 23:57:52,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376997463] [2023-11-24 23:57:52,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:52,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:57:52,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:52,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:57:52,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:52,896 INFO L87 Difference]: Start difference. First operand 3307 states and 5189 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-24 23:57:53,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:53,287 INFO L93 Difference]: Finished difference Result 7343 states and 11583 transitions. [2023-11-24 23:57:53,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:57:53,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 88 [2023-11-24 23:57:53,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:53,327 INFO L225 Difference]: With dead ends: 7343 [2023-11-24 23:57:53,328 INFO L226 Difference]: Without dead ends: 4048 [2023-11-24 23:57:53,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:57:53,354 INFO L413 NwaCegarLoop]: 716 mSDtfsCounter, 563 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 563 SdHoareTripleChecker+Valid, 1219 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:53,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [563 Valid, 1219 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:57:53,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4048 states. [2023-11-24 23:57:53,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4048 to 3254. [2023-11-24 23:57:53,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3254 states, 2239 states have (on average 1.511835640911121) internal successors, (3385), 2388 states have internal predecessors, (3385), 799 states have call successors, (799), 220 states have call predecessors, (799), 215 states have return successors, (902), 741 states have call predecessors, (902), 793 states have call successors, (902) [2023-11-24 23:57:53,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3254 states to 3254 states and 5086 transitions. [2023-11-24 23:57:53,669 INFO L78 Accepts]: Start accepts. Automaton has 3254 states and 5086 transitions. Word has length 88 [2023-11-24 23:57:53,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:53,670 INFO L495 AbstractCegarLoop]: Abstraction has 3254 states and 5086 transitions. [2023-11-24 23:57:53,670 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-24 23:57:53,670 INFO L276 IsEmpty]: Start isEmpty. Operand 3254 states and 5086 transitions. [2023-11-24 23:57:53,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-11-24 23:57:53,674 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:53,674 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:53,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:53,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:53,892 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:53,892 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:53,892 INFO L85 PathProgramCache]: Analyzing trace with hash -468507611, now seen corresponding path program 1 times [2023-11-24 23:57:53,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:53,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772541003] [2023-11-24 23:57:53,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:53,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:53,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:54,612 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:57:54,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:54,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772541003] [2023-11-24 23:57:54,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772541003] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:54,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623213784] [2023-11-24 23:57:54,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:54,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:54,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:54,615 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:54,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:57:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:55,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 1602 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-24 23:57:55,020 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:55,344 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:57:55,344 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:55,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623213784] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:55,345 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:55,345 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 15 [2023-11-24 23:57:55,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336563100] [2023-11-24 23:57:55,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:55,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:57:55,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:55,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:57:55,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:57:55,348 INFO L87 Difference]: Start difference. First operand 3254 states and 5086 transitions. Second operand has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-24 23:57:56,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:56,966 INFO L93 Difference]: Finished difference Result 6857 states and 10707 transitions. [2023-11-24 23:57:56,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:57:56,970 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 94 [2023-11-24 23:57:56,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:57,001 INFO L225 Difference]: With dead ends: 6857 [2023-11-24 23:57:57,002 INFO L226 Difference]: Without dead ends: 3615 [2023-11-24 23:57:57,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2023-11-24 23:57:57,028 INFO L413 NwaCegarLoop]: 612 mSDtfsCounter, 1333 mSDsluCounter, 1339 mSDsCounter, 0 mSdLazyCounter, 1296 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1336 SdHoareTripleChecker+Valid, 1951 SdHoareTripleChecker+Invalid, 1434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 1296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:57,029 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1336 Valid, 1951 Invalid, 1434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 1296 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-24 23:57:57,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3615 states. [2023-11-24 23:57:57,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3615 to 3594. [2023-11-24 23:57:57,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3594 states, 2495 states have (on average 1.492184368737475) internal successors, (3723), 2652 states have internal predecessors, (3723), 859 states have call successors, (859), 248 states have call predecessors, (859), 239 states have return successors, (964), 789 states have call predecessors, (964), 853 states have call successors, (964) [2023-11-24 23:57:57,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3594 states to 3594 states and 5546 transitions. [2023-11-24 23:57:57,413 INFO L78 Accepts]: Start accepts. Automaton has 3594 states and 5546 transitions. Word has length 94 [2023-11-24 23:57:57,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:57,413 INFO L495 AbstractCegarLoop]: Abstraction has 3594 states and 5546 transitions. [2023-11-24 23:57:57,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 5 states have internal predecessors, (55), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2023-11-24 23:57:57,414 INFO L276 IsEmpty]: Start isEmpty. Operand 3594 states and 5546 transitions. [2023-11-24 23:57:57,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-24 23:57:57,418 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:57,418 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:57,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:57:57,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:57,626 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:57:57,627 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:57:57,627 INFO L85 PathProgramCache]: Analyzing trace with hash -438204171, now seen corresponding path program 1 times [2023-11-24 23:57:57,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:57:57,627 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90885455] [2023-11-24 23:57:57,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:57,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:57:57,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:58,362 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-24 23:57:58,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:57:58,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90885455] [2023-11-24 23:57:58,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90885455] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:57:58,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117735042] [2023-11-24 23:57:58,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:57:58,363 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:57:58,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:57:58,364 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:57:58,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:57:58,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:57:58,762 INFO L262 TraceCheckSpWp]: Trace formula consists of 1616 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-24 23:57:58,767 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:57:58,828 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:57:58,828 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:57:58,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117735042] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:57:58,829 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:57:58,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2023-11-24 23:57:58,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564652198] [2023-11-24 23:57:58,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:57:58,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 23:57:58,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:57:58,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 23:57:58,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2023-11-24 23:57:58,831 INFO L87 Difference]: Start difference. First operand 3594 states and 5546 transitions. Second operand has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-24 23:57:59,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:57:59,492 INFO L93 Difference]: Finished difference Result 7187 states and 11308 transitions. [2023-11-24 23:57:59,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:57:59,493 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 99 [2023-11-24 23:57:59,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:57:59,546 INFO L225 Difference]: With dead ends: 7187 [2023-11-24 23:57:59,546 INFO L226 Difference]: Without dead ends: 4434 [2023-11-24 23:57:59,559 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:57:59,560 INFO L413 NwaCegarLoop]: 614 mSDtfsCounter, 139 mSDsluCounter, 2425 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 3039 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:57:59,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 3039 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:57:59,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4434 states. [2023-11-24 23:57:59,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4434 to 4017. [2023-11-24 23:57:59,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4017 states, 2733 states have (on average 1.4844493230881814) internal successors, (4057), 2949 states have internal predecessors, (4057), 1029 states have call successors, (1029), 248 states have call predecessors, (1029), 254 states have return successors, (1180), 957 states have call predecessors, (1180), 1023 states have call successors, (1180) [2023-11-24 23:57:59,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4017 states to 4017 states and 6266 transitions. [2023-11-24 23:57:59,919 INFO L78 Accepts]: Start accepts. Automaton has 4017 states and 6266 transitions. Word has length 99 [2023-11-24 23:57:59,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:57:59,920 INFO L495 AbstractCegarLoop]: Abstraction has 4017 states and 6266 transitions. [2023-11-24 23:57:59,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.5) internal successors, (57), 5 states have internal predecessors, (57), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-24 23:57:59,921 INFO L276 IsEmpty]: Start isEmpty. Operand 4017 states and 6266 transitions. [2023-11-24 23:57:59,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-24 23:57:59,926 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:57:59,926 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:57:59,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:58:00,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-24 23:58:00,134 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:58:00,134 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:58:00,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1939897930, now seen corresponding path program 1 times [2023-11-24 23:58:00,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:58:00,135 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252947177] [2023-11-24 23:58:00,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:00,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:58:00,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:00,842 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-24 23:58:00,842 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:58:00,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252947177] [2023-11-24 23:58:00,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252947177] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:58:00,843 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410599283] [2023-11-24 23:58:00,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:00,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:58:00,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:58:00,845 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:58:00,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:58:01,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:01,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 1627 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-24 23:58:01,240 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:58:01,529 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:58:01,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:58:01,818 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-24 23:58:01,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410599283] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:58:01,819 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:58:01,819 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2023-11-24 23:58:01,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047502537] [2023-11-24 23:58:01,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:58:01,820 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-24 23:58:01,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:58:01,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-24 23:58:01,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2023-11-24 23:58:01,821 INFO L87 Difference]: Start difference. First operand 4017 states and 6266 transitions. Second operand has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-24 23:58:06,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:58:06,082 INFO L93 Difference]: Finished difference Result 10709 states and 17219 transitions. [2023-11-24 23:58:06,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:58:06,083 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) Word has length 103 [2023-11-24 23:58:06,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:58:06,157 INFO L225 Difference]: With dead ends: 10709 [2023-11-24 23:58:06,157 INFO L226 Difference]: Without dead ends: 7899 [2023-11-24 23:58:06,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 201 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2023-11-24 23:58:06,174 INFO L413 NwaCegarLoop]: 636 mSDtfsCounter, 3065 mSDsluCounter, 2019 mSDsCounter, 0 mSdLazyCounter, 1894 mSolverCounterSat, 1400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3152 SdHoareTripleChecker+Valid, 2655 SdHoareTripleChecker+Invalid, 3294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1400 IncrementalHoareTripleChecker+Valid, 1894 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:58:06,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3152 Valid, 2655 Invalid, 3294 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1400 Valid, 1894 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2023-11-24 23:58:06,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7899 states. [2023-11-24 23:58:06,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7899 to 7008. [2023-11-24 23:58:06,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7008 states, 4974 states have (on average 1.4931644551668677) internal successors, (7427), 5232 states have internal predecessors, (7427), 1519 states have call successors, (1519), 484 states have call predecessors, (1519), 514 states have return successors, (2012), 1435 states have call predecessors, (2012), 1511 states have call successors, (2012) [2023-11-24 23:58:06,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7008 states to 7008 states and 10958 transitions. [2023-11-24 23:58:06,775 INFO L78 Accepts]: Start accepts. Automaton has 7008 states and 10958 transitions. Word has length 103 [2023-11-24 23:58:06,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:58:06,776 INFO L495 AbstractCegarLoop]: Abstraction has 7008 states and 10958 transitions. [2023-11-24 23:58:06,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 4 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (19), 4 states have call predecessors, (19), 3 states have call successors, (19) [2023-11-24 23:58:06,776 INFO L276 IsEmpty]: Start isEmpty. Operand 7008 states and 10958 transitions. [2023-11-24 23:58:06,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2023-11-24 23:58:06,780 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:58:06,780 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:58:06,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:58:06,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-24 23:58:06,992 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:58:06,992 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:58:06,992 INFO L85 PathProgramCache]: Analyzing trace with hash 915246445, now seen corresponding path program 1 times [2023-11-24 23:58:06,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:58:06,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88289024] [2023-11-24 23:58:06,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:06,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:58:07,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:07,655 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-24 23:58:07,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:58:07,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88289024] [2023-11-24 23:58:07,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88289024] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:58:07,656 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200685528] [2023-11-24 23:58:07,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:07,656 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:58:07,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:58:07,658 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:58:07,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:58:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:08,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-24 23:58:08,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:58:08,207 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-24 23:58:08,207 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:58:08,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200685528] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:58:08,208 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:58:08,208 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-11-24 23:58:08,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929249969] [2023-11-24 23:58:08,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:58:08,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:58:08,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:58:08,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:58:08,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2023-11-24 23:58:08,210 INFO L87 Difference]: Start difference. First operand 7008 states and 10958 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-24 23:58:09,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:58:09,283 INFO L93 Difference]: Finished difference Result 12823 states and 20078 transitions. [2023-11-24 23:58:09,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:58:09,284 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) Word has length 107 [2023-11-24 23:58:09,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:58:09,331 INFO L225 Difference]: With dead ends: 12823 [2023-11-24 23:58:09,332 INFO L226 Difference]: Without dead ends: 7030 [2023-11-24 23:58:09,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:58:09,357 INFO L413 NwaCegarLoop]: 653 mSDtfsCounter, 424 mSDsluCounter, 1699 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 2352 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:58:09,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [424 Valid, 2352 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:58:09,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7030 states. [2023-11-24 23:58:09,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7030 to 7008. [2023-11-24 23:58:09,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7008 states, 4974 states have (on average 1.4931644551668677) internal successors, (7427), 5232 states have internal predecessors, (7427), 1519 states have call successors, (1519), 484 states have call predecessors, (1519), 514 states have return successors, (2004), 1435 states have call predecessors, (2004), 1511 states have call successors, (2004) [2023-11-24 23:58:10,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7008 states to 7008 states and 10950 transitions. [2023-11-24 23:58:10,044 INFO L78 Accepts]: Start accepts. Automaton has 7008 states and 10950 transitions. Word has length 107 [2023-11-24 23:58:10,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:58:10,044 INFO L495 AbstractCegarLoop]: Abstraction has 7008 states and 10950 transitions. [2023-11-24 23:58:10,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 5 states have internal predecessors, (56), 4 states have call successors, (22), 3 states have call predecessors, (22), 4 states have return successors, (20), 3 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-24 23:58:10,045 INFO L276 IsEmpty]: Start isEmpty. Operand 7008 states and 10950 transitions. [2023-11-24 23:58:10,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2023-11-24 23:58:10,052 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:58:10,053 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:58:10,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-24 23:58:10,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:58:10,266 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:58:10,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:58:10,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1128794080, now seen corresponding path program 1 times [2023-11-24 23:58:10,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:58:10,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640304354] [2023-11-24 23:58:10,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:10,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:58:10,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:11,083 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-24 23:58:11,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:58:11,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640304354] [2023-11-24 23:58:11,084 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640304354] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:58:11,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752235399] [2023-11-24 23:58:11,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:11,084 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:58:11,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:58:11,085 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:58:11,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-24 23:58:11,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:11,470 INFO L262 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-24 23:58:11,476 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:58:11,919 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-24 23:58:11,920 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:58:11,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752235399] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:58:11,920 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:58:11,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2023-11-24 23:58:11,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772991106] [2023-11-24 23:58:11,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:58:11,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:58:11,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:58:11,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:58:11,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2023-11-24 23:58:11,924 INFO L87 Difference]: Start difference. First operand 7008 states and 10950 transitions. Second operand has 7 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-11-24 23:58:13,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:58:13,545 INFO L93 Difference]: Finished difference Result 14602 states and 22803 transitions. [2023-11-24 23:58:13,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 23:58:13,546 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 134 [2023-11-24 23:58:13,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:58:13,600 INFO L225 Difference]: With dead ends: 14602 [2023-11-24 23:58:13,601 INFO L226 Difference]: Without dead ends: 7606 [2023-11-24 23:58:13,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-24 23:58:13,635 INFO L413 NwaCegarLoop]: 671 mSDtfsCounter, 441 mSDsluCounter, 2399 mSDsCounter, 0 mSdLazyCounter, 1068 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 447 SdHoareTripleChecker+Valid, 3070 SdHoareTripleChecker+Invalid, 1086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1068 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:58:13,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [447 Valid, 3070 Invalid, 1086 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1068 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-24 23:58:13,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7606 states. [2023-11-24 23:58:14,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7606 to 7555. [2023-11-24 23:58:14,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7555 states, 5362 states have (on average 1.4886236478925774) internal successors, (7982), 5647 states have internal predecessors, (7982), 1642 states have call successors, (1642), 517 states have call predecessors, (1642), 550 states have return successors, (2138), 1546 states have call predecessors, (2138), 1634 states have call successors, (2138) [2023-11-24 23:58:14,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7555 states to 7555 states and 11762 transitions. [2023-11-24 23:58:14,334 INFO L78 Accepts]: Start accepts. Automaton has 7555 states and 11762 transitions. Word has length 134 [2023-11-24 23:58:14,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:58:14,334 INFO L495 AbstractCegarLoop]: Abstraction has 7555 states and 11762 transitions. [2023-11-24 23:58:14,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-11-24 23:58:14,335 INFO L276 IsEmpty]: Start isEmpty. Operand 7555 states and 11762 transitions. [2023-11-24 23:58:14,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-11-24 23:58:14,342 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:58:14,342 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:58:14,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-24 23:58:14,550 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3e7eb825-ce8d-47f7-8d0f-8c1bad10315f/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-24 23:58:14,550 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:58:14,551 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:58:14,551 INFO L85 PathProgramCache]: Analyzing trace with hash -521641864, now seen corresponding path program 1 times [2023-11-24 23:58:14,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:58:14,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412767849] [2023-11-24 23:58:14,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:58:14,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:58:14,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:58:15,496 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-24 23:58:15,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:58:15,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412767849] [2023-11-24 23:58:15,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412767849] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:58:15,497 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:58:15,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2023-11-24 23:58:15,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864617039] [2023-11-24 23:58:15,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:58:15,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-24 23:58:15,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:58:15,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-24 23:58:15,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2023-11-24 23:58:15,499 INFO L87 Difference]: Start difference. First operand 7555 states and 11762 transitions. Second operand has 14 states, 12 states have (on average 5.25) internal successors, (63), 11 states have internal predecessors, (63), 6 states have call successors, (26), 4 states have call predecessors, (26), 5 states have return successors, (24), 7 states have call predecessors, (24), 5 states have call successors, (24)