./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/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 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:52:07,156 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:52:07,223 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:52:07,229 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:52:07,230 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:52:07,256 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:52:07,257 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:52:07,258 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:52:07,259 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:52:07,260 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:52:07,260 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:52:07,261 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:52:07,262 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:52:07,262 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:52:07,263 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:52:07,264 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:52:07,265 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:52:07,265 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:52:07,266 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:52:07,267 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:52:07,267 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:52:07,268 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:52:07,269 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:52:07,270 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:52:07,270 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:52:07,271 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:52:07,272 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:52:07,272 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:52:07,273 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:52:07,273 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:52:07,274 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:52:07,274 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:52:07,274 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:52:07,275 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:52:07,275 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:52:07,276 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:52:07,276 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:52:07,277 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:52:07,277 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:52:07,278 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:52:07,278 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:52:07,278 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:52:07,279 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:52:07,279 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:52:07,279 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:52:07,280 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:52:07,280 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:52:07,280 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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 [2023-11-24 23:52:07,636 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:52:07,660 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:52:07,663 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:52:07,664 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:52:07,665 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:52:07,666 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2023-11-24 23:52:10,813 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:52:11,247 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:52:11,248 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2023-11-24 23:52:11,282 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/data/bb1f6ac49/b97973ab898447f78e23f9b43e5f918b/FLAG43a9a4cb1 [2023-11-24 23:52:11,304 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/data/bb1f6ac49/b97973ab898447f78e23f9b43e5f918b [2023-11-24 23:52:11,306 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:52:11,308 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:52:11,310 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:52:11,310 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:52:11,324 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:52:11,328 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:52:11" (1/1) ... [2023-11-24 23:52:11,329 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@581e87d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:11, skipping insertion in model container [2023-11-24 23:52:11,329 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:52:11" (1/1) ... [2023-11-24 23:52:11,411 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:52:11,959 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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2023-11-24 23:52:12,156 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:52:12,174 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:52:12,187 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [48] [2023-11-24 23:52:12,189 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [408] [2023-11-24 23:52:12,189 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [528] [2023-11-24 23:52:12,190 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [620] [2023-11-24 23:52:12,190 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [1287] [2023-11-24 23:52:12,190 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [1477] [2023-11-24 23:52:12,191 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [1843] [2023-11-24 23:52:12,192 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [1878] [2023-11-24 23:52:12,192 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [1893] [2023-11-24 23:52:12,192 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [1902] [2023-11-24 23:52:12,292 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_bcd6898a-fb69-4ee6-9c82-b534a5326a49/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2023-11-24 23:52:12,336 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:52:12,367 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:52:12,367 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12 WrapperNode [2023-11-24 23:52:12,368 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:52:12,369 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:52:12,369 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:52:12,369 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:52:12,375 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,405 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,476 INFO L138 Inliner]: procedures = 86, calls = 334, calls flagged for inlining = 21, calls inlined = 18, statements flattened = 749 [2023-11-24 23:52:12,481 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:52:12,481 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:52:12,482 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:52:12,482 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:52:12,496 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,496 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,509 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,509 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,553 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,585 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,595 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,601 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,626 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:52:12,636 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:52:12,636 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:52:12,637 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:52:12,638 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (1/1) ... [2023-11-24 23:52:12,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:52:12,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:12,693 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:52:12,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:52:12,760 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:52:12,760 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-24 23:52:12,761 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-24 23:52:12,761 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-24 23:52:12,761 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-24 23:52:12,762 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-24 23:52:12,763 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-24 23:52:12,763 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-24 23:52:12,763 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-24 23:52:12,764 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-24 23:52:12,764 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-24 23:52:12,764 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-24 23:52:12,765 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-24 23:52:12,766 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-24 23:52:12,767 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-24 23:52:12,767 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-24 23:52:12,769 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-24 23:52:12,770 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-24 23:52:12,770 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-24 23:52:12,770 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-24 23:52:12,770 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-24 23:52:12,771 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-24 23:52:12,772 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-24 23:52:12,772 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-24 23:52:12,772 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-24 23:52:12,772 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-24 23:52:12,773 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-24 23:52:12,773 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-24 23:52:12,773 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-24 23:52:12,773 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-24 23:52:12,773 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-24 23:52:12,774 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-24 23:52:12,774 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-24 23:52:12,774 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-24 23:52:12,774 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-24 23:52:12,775 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-24 23:52:12,775 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-24 23:52:12,775 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:52:12,775 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-24 23:52:12,775 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-24 23:52:12,776 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-24 23:52:12,776 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-24 23:52:12,776 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-24 23:52:12,776 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-24 23:52:12,776 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-24 23:52:12,776 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-24 23:52:12,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:52:12,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:52:12,777 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-24 23:52:12,778 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-24 23:52:12,994 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:52:12,998 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:52:14,188 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:52:14,979 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:52:14,979 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-24 23:52:14,981 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:52:14 BoogieIcfgContainer [2023-11-24 23:52:14,981 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:52:14,983 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:52:14,984 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:52:14,987 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:52:14,987 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:52:11" (1/3) ... [2023-11-24 23:52:14,988 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54bd0e75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:52:14, skipping insertion in model container [2023-11-24 23:52:14,988 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:52:12" (2/3) ... [2023-11-24 23:52:14,989 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54bd0e75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:52:14, skipping insertion in model container [2023-11-24 23:52:14,989 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:52:14" (3/3) ... [2023-11-24 23:52:14,990 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product01.cil.c [2023-11-24 23:52:15,009 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:52:15,009 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:52:15,073 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:52:15,080 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;@7d4de915, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:52:15,080 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:52:15,087 INFO L276 IsEmpty]: Start isEmpty. Operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2023-11-24 23:52:15,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-24 23:52:15,106 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:15,107 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:15,107 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:15,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:15,113 INFO L85 PathProgramCache]: Analyzing trace with hash -987056832, now seen corresponding path program 1 times [2023-11-24 23:52:15,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:15,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150547435] [2023-11-24 23:52:15,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:15,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:15,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:16,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-24 23:52:16,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:16,348 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150547435] [2023-11-24 23:52:16,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150547435] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:16,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715017514] [2023-11-24 23:52:16,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:16,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:16,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:16,362 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:16,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:52:16,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:16,809 INFO L262 TraceCheckSpWp]: Trace formula consists of 1492 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:52:16,820 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:16,925 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:52:16,925 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:16,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715017514] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:16,926 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:16,926 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-11-24 23:52:16,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387429483] [2023-11-24 23:52:16,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:16,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:52:16,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:16,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:52:16,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:16,985 INFO L87 Difference]: Start difference. First operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-24 23:52:17,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:17,346 INFO L93 Difference]: Finished difference Result 1056 states and 1713 transitions. [2023-11-24 23:52:17,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:52:17,349 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 63 [2023-11-24 23:52:17,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:17,369 INFO L225 Difference]: With dead ends: 1056 [2023-11-24 23:52:17,369 INFO L226 Difference]: Without dead ends: 681 [2023-11-24 23:52:17,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:17,382 INFO L413 NwaCegarLoop]: 569 mSDtfsCounter, 549 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 549 SdHoareTripleChecker+Valid, 1045 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:17,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [549 Valid, 1045 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:52:17,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2023-11-24 23:52:17,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 669. [2023-11-24 23:52:17,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 669 states, 456 states have (on average 1.5921052631578947) internal successors, (726), 487 states have internal predecessors, (726), 172 states have call successors, (172), 41 states have call predecessors, (172), 40 states have return successors, (174), 166 states have call predecessors, (174), 169 states have call successors, (174) [2023-11-24 23:52:17,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 669 states to 669 states and 1072 transitions. [2023-11-24 23:52:17,522 INFO L78 Accepts]: Start accepts. Automaton has 669 states and 1072 transitions. Word has length 63 [2023-11-24 23:52:17,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:17,524 INFO L495 AbstractCegarLoop]: Abstraction has 669 states and 1072 transitions. [2023-11-24 23:52:17,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-24 23:52:17,524 INFO L276 IsEmpty]: Start isEmpty. Operand 669 states and 1072 transitions. [2023-11-24 23:52:17,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-11-24 23:52:17,533 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:17,534 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:17,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:17,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-24 23:52:17,743 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:17,744 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:17,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1469299784, now seen corresponding path program 1 times [2023-11-24 23:52:17,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:17,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973917002] [2023-11-24 23:52:17,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:17,746 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:17,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:18,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:52:18,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:18,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973917002] [2023-11-24 23:52:18,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973917002] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:18,207 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:52:18,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 23:52:18,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702898948] [2023-11-24 23:52:18,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:18,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:52:18,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:18,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:52:18,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 23:52:18,211 INFO L87 Difference]: Start difference. First operand 669 states and 1072 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-24 23:52:18,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:18,615 INFO L93 Difference]: Finished difference Result 1528 states and 2495 transitions. [2023-11-24 23:52:18,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:52:18,616 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 64 [2023-11-24 23:52:18,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:18,630 INFO L225 Difference]: With dead ends: 1528 [2023-11-24 23:52:18,630 INFO L226 Difference]: Without dead ends: 871 [2023-11-24 23:52:18,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 23:52:18,637 INFO L413 NwaCegarLoop]: 577 mSDtfsCounter, 210 mSDsluCounter, 1608 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 2185 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:18,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 2185 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:52:18,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2023-11-24 23:52:18,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 673. [2023-11-24 23:52:18,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 460 states have (on average 1.5869565217391304) internal successors, (730), 491 states have internal predecessors, (730), 172 states have call successors, (172), 41 states have call predecessors, (172), 40 states have return successors, (174), 166 states have call predecessors, (174), 169 states have call successors, (174) [2023-11-24 23:52:18,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 1076 transitions. [2023-11-24 23:52:18,768 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 1076 transitions. Word has length 64 [2023-11-24 23:52:18,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:18,769 INFO L495 AbstractCegarLoop]: Abstraction has 673 states and 1076 transitions. [2023-11-24 23:52:18,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 2 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-24 23:52:18,770 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 1076 transitions. [2023-11-24 23:52:18,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-24 23:52:18,776 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:18,776 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 23:52:18,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 23:52:18,776 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:18,778 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:18,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1769310191, now seen corresponding path program 1 times [2023-11-24 23:52:18,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:18,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599780796] [2023-11-24 23:52:18,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:18,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:18,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:19,253 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:52:19,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:19,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599780796] [2023-11-24 23:52:19,255 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599780796] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:19,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76035072] [2023-11-24 23:52:19,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:19,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:19,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:19,261 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:19,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:52:19,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:19,624 INFO L262 TraceCheckSpWp]: Trace formula consists of 1514 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-24 23:52:19,632 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:19,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:52:19,805 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:19,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76035072] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:19,805 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:19,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-24 23:52:19,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363269500] [2023-11-24 23:52:19,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:19,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:52:19,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:19,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:52:19,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-24 23:52:19,808 INFO L87 Difference]: Start difference. First operand 673 states and 1076 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2023-11-24 23:52:20,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:20,220 INFO L93 Difference]: Finished difference Result 1917 states and 3100 transitions. [2023-11-24 23:52:20,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:52:20,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) Word has length 68 [2023-11-24 23:52:20,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:20,236 INFO L225 Difference]: With dead ends: 1917 [2023-11-24 23:52:20,236 INFO L226 Difference]: Without dead ends: 1256 [2023-11-24 23:52:20,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 69 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 23:52:20,246 INFO L413 NwaCegarLoop]: 594 mSDtfsCounter, 471 mSDsluCounter, 480 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 1074 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:20,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 1074 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:52:20,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1256 states. [2023-11-24 23:52:20,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1256 to 1236. [2023-11-24 23:52:20,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1236 states, 841 states have (on average 1.5422116527942924) internal successors, (1297), 901 states have internal predecessors, (1297), 321 states have call successors, (321), 76 states have call predecessors, (321), 73 states have return successors, (340), 308 states have call predecessors, (340), 317 states have call successors, (340) [2023-11-24 23:52:20,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1236 states to 1236 states and 1958 transitions. [2023-11-24 23:52:20,361 INFO L78 Accepts]: Start accepts. Automaton has 1236 states and 1958 transitions. Word has length 68 [2023-11-24 23:52:20,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:20,363 INFO L495 AbstractCegarLoop]: Abstraction has 1236 states and 1958 transitions. [2023-11-24 23:52:20,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 3 states have call successors, (12) [2023-11-24 23:52:20,363 INFO L276 IsEmpty]: Start isEmpty. Operand 1236 states and 1958 transitions. [2023-11-24 23:52:20,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-11-24 23:52:20,369 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:20,369 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:20,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:20,577 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:20,578 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:20,578 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:20,578 INFO L85 PathProgramCache]: Analyzing trace with hash 476548221, now seen corresponding path program 1 times [2023-11-24 23:52:20,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:20,579 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452854577] [2023-11-24 23:52:20,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:20,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:20,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:21,040 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:52:21,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:21,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452854577] [2023-11-24 23:52:21,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452854577] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:21,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059533647] [2023-11-24 23:52:21,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:21,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:21,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:21,043 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:21,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:52:21,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:21,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 1530 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-24 23:52:21,425 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:21,564 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:52:21,564 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:21,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059533647] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:21,565 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:21,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-11-24 23:52:21,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634145845] [2023-11-24 23:52:21,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:21,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:52:21,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:21,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:52:21,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:21,568 INFO L87 Difference]: Start difference. First operand 1236 states and 1958 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-24 23:52:22,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:22,374 INFO L93 Difference]: Finished difference Result 2177 states and 3426 transitions. [2023-11-24 23:52:22,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:22,376 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 72 [2023-11-24 23:52:22,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:22,389 INFO L225 Difference]: With dead ends: 2177 [2023-11-24 23:52:22,395 INFO L226 Difference]: Without dead ends: 1394 [2023-11-24 23:52:22,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:52:22,407 INFO L413 NwaCegarLoop]: 629 mSDtfsCounter, 461 mSDsluCounter, 1467 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 2096 SdHoareTripleChecker+Invalid, 536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:22,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [469 Valid, 2096 Invalid, 536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-24 23:52:22,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1394 states. [2023-11-24 23:52:22,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1394 to 1380. [2023-11-24 23:52:22,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1380 states, 957 states have (on average 1.5245559038662486) internal successors, (1459), 1019 states have internal predecessors, (1459), 339 states have call successors, (339), 84 states have call predecessors, (339), 83 states have return successors, (360), 326 states have call predecessors, (360), 335 states have call successors, (360) [2023-11-24 23:52:22,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1380 states to 1380 states and 2158 transitions. [2023-11-24 23:52:22,565 INFO L78 Accepts]: Start accepts. Automaton has 1380 states and 2158 transitions. Word has length 72 [2023-11-24 23:52:22,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:22,565 INFO L495 AbstractCegarLoop]: Abstraction has 1380 states and 2158 transitions. [2023-11-24 23:52:22,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-24 23:52:22,566 INFO L276 IsEmpty]: Start isEmpty. Operand 1380 states and 2158 transitions. [2023-11-24 23:52:22,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-24 23:52:22,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:22,570 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 23:52:22,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:22,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:22,779 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:22,779 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:22,779 INFO L85 PathProgramCache]: Analyzing trace with hash -891555137, now seen corresponding path program 1 times [2023-11-24 23:52:22,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:22,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976914954] [2023-11-24 23:52:22,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:22,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:22,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:23,152 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:52:23,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:23,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976914954] [2023-11-24 23:52:23,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976914954] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:23,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111265763] [2023-11-24 23:52:23,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:23,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:23,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:23,155 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:23,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:52:23,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:23,565 INFO L262 TraceCheckSpWp]: Trace formula consists of 1519 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-24 23:52:23,570 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:23,612 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:52:23,613 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:23,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111265763] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:23,613 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:23,613 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-11-24 23:52:23,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082634333] [2023-11-24 23:52:23,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:23,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:52:23,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:23,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:52:23,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-24 23:52:23,616 INFO L87 Difference]: Start difference. First operand 1380 states and 2158 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-11-24 23:52:23,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:23,929 INFO L93 Difference]: Finished difference Result 2565 states and 4059 transitions. [2023-11-24 23:52:23,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 23:52:23,930 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 73 [2023-11-24 23:52:23,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:23,944 INFO L225 Difference]: With dead ends: 2565 [2023-11-24 23:52:23,944 INFO L226 Difference]: Without dead ends: 1380 [2023-11-24 23:52:23,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:23,954 INFO L413 NwaCegarLoop]: 591 mSDtfsCounter, 273 mSDsluCounter, 944 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 1535 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:23,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 1535 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:52:23,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1380 states. [2023-11-24 23:52:24,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1380 to 1380. [2023-11-24 23:52:24,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1380 states, 957 states have (on average 1.4869383490073145) internal successors, (1423), 1019 states have internal predecessors, (1423), 339 states have call successors, (339), 84 states have call predecessors, (339), 83 states have return successors, (360), 326 states have call predecessors, (360), 335 states have call successors, (360) [2023-11-24 23:52:24,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1380 states to 1380 states and 2122 transitions. [2023-11-24 23:52:24,071 INFO L78 Accepts]: Start accepts. Automaton has 1380 states and 2122 transitions. Word has length 73 [2023-11-24 23:52:24,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:24,073 INFO L495 AbstractCegarLoop]: Abstraction has 1380 states and 2122 transitions. [2023-11-24 23:52:24,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-11-24 23:52:24,073 INFO L276 IsEmpty]: Start isEmpty. Operand 1380 states and 2122 transitions. [2023-11-24 23:52:24,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-24 23:52:24,076 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:24,076 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 23:52:24,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:24,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:24,285 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:24,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:24,286 INFO L85 PathProgramCache]: Analyzing trace with hash 1251081371, now seen corresponding path program 1 times [2023-11-24 23:52:24,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:24,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979111043] [2023-11-24 23:52:24,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:24,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:24,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:24,796 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:52:24,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:24,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979111043] [2023-11-24 23:52:24,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979111043] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:24,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272001351] [2023-11-24 23:52:24,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:24,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:24,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:24,799 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:24,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 23:52:25,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:25,189 INFO L262 TraceCheckSpWp]: Trace formula consists of 1529 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-24 23:52:25,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:52:25,469 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:52:25,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:52:25,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272001351] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:25,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-24 23:52:25,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 16 [2023-11-24 23:52:25,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350044311] [2023-11-24 23:52:25,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:25,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-24 23:52:25,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:25,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-24 23:52:25,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:52:25,731 INFO L87 Difference]: Start difference. First operand 1380 states and 2122 transitions. Second operand has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2023-11-24 23:52:29,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:29,216 INFO L93 Difference]: Finished difference Result 3283 states and 5183 transitions. [2023-11-24 23:52:29,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-24 23:52:29,217 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 75 [2023-11-24 23:52:29,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:29,235 INFO L225 Difference]: With dead ends: 3283 [2023-11-24 23:52:29,236 INFO L226 Difference]: Without dead ends: 2501 [2023-11-24 23:52:29,242 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2023-11-24 23:52:29,243 INFO L413 NwaCegarLoop]: 603 mSDtfsCounter, 1792 mSDsluCounter, 2364 mSDsCounter, 0 mSdLazyCounter, 2077 mSolverCounterSat, 795 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1870 SdHoareTripleChecker+Valid, 2967 SdHoareTripleChecker+Invalid, 2872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 795 IncrementalHoareTripleChecker+Valid, 2077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:29,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1870 Valid, 2967 Invalid, 2872 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [795 Valid, 2077 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-11-24 23:52:29,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2501 states. [2023-11-24 23:52:29,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2501 to 2419. [2023-11-24 23:52:29,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2419 states, 1720 states have (on average 1.4924418604651162) internal successors, (2567), 1815 states have internal predecessors, (2567), 548 states have call successors, (548), 145 states have call predecessors, (548), 150 states have return successors, (656), 530 states have call predecessors, (656), 543 states have call successors, (656) [2023-11-24 23:52:29,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2419 states to 2419 states and 3771 transitions. [2023-11-24 23:52:29,462 INFO L78 Accepts]: Start accepts. Automaton has 2419 states and 3771 transitions. Word has length 75 [2023-11-24 23:52:29,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:29,463 INFO L495 AbstractCegarLoop]: Abstraction has 2419 states and 3771 transitions. [2023-11-24 23:52:29,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2023-11-24 23:52:29,464 INFO L276 IsEmpty]: Start isEmpty. Operand 2419 states and 3771 transitions. [2023-11-24 23:52:29,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-24 23:52:29,467 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:29,468 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 23:52:29,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:29,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:29,676 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:29,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:29,677 INFO L85 PathProgramCache]: Analyzing trace with hash -345102957, now seen corresponding path program 1 times [2023-11-24 23:52:29,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:29,677 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982199780] [2023-11-24 23:52:29,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:29,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:29,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:30,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-24 23:52:30,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:30,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982199780] [2023-11-24 23:52:30,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [982199780] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:30,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012725416] [2023-11-24 23:52:30,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:30,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:30,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:30,099 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:30,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 23:52:30,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:30,502 INFO L262 TraceCheckSpWp]: Trace formula consists of 1519 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-24 23:52:30,506 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:30,585 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 23:52:30,585 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:30,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012725416] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:30,585 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:30,585 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-11-24 23:52:30,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933503898] [2023-11-24 23:52:30,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:30,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:52:30,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:30,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:52:30,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:30,588 INFO L87 Difference]: Start difference. First operand 2419 states and 3771 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, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-11-24 23:52:30,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:30,983 INFO L93 Difference]: Finished difference Result 5980 states and 9479 transitions. [2023-11-24 23:52:30,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:52:30,984 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, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 75 [2023-11-24 23:52:30,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:31,022 INFO L225 Difference]: With dead ends: 5980 [2023-11-24 23:52:31,022 INFO L226 Difference]: Without dead ends: 3573 [2023-11-24 23:52:31,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:31,045 INFO L413 NwaCegarLoop]: 657 mSDtfsCounter, 521 mSDsluCounter, 459 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 1116 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 23:52:31,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [521 Valid, 1116 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:31,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3573 states. [2023-11-24 23:52:31,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3573 to 3505. [2023-11-24 23:52:31,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3505 states, 2502 states have (on average 1.4900079936051158) internal successors, (3728), 2645 states have internal predecessors, (3728), 784 states have call successors, (784), 207 states have call predecessors, (784), 218 states have return successors, (955), 760 states have call predecessors, (955), 779 states have call successors, (955) [2023-11-24 23:52:31,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3505 states to 3505 states and 5467 transitions. [2023-11-24 23:52:31,470 INFO L78 Accepts]: Start accepts. Automaton has 3505 states and 5467 transitions. Word has length 75 [2023-11-24 23:52:31,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:31,470 INFO L495 AbstractCegarLoop]: Abstraction has 3505 states and 5467 transitions. [2023-11-24 23:52:31,471 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, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-11-24 23:52:31,471 INFO L276 IsEmpty]: Start isEmpty. Operand 3505 states and 5467 transitions. [2023-11-24 23:52:31,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-11-24 23:52:31,477 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:31,477 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 23:52:31,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:31,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:31,691 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:31,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:31,692 INFO L85 PathProgramCache]: Analyzing trace with hash 603597063, now seen corresponding path program 1 times [2023-11-24 23:52:31,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:31,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567825712] [2023-11-24 23:52:31,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:31,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:31,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:32,007 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:52:32,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:32,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567825712] [2023-11-24 23:52:32,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567825712] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:32,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904509020] [2023-11-24 23:52:32,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:32,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:32,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:32,012 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:32,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 23:52:32,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:32,379 INFO L262 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-24 23:52:32,384 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:32,440 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:52:32,440 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:32,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904509020] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:32,441 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:32,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2023-11-24 23:52:32,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405528138] [2023-11-24 23:52:32,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:32,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:52:32,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:32,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:52:32,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:52:32,443 INFO L87 Difference]: Start difference. First operand 3505 states and 5467 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-24 23:52:33,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:33,070 INFO L93 Difference]: Finished difference Result 6744 states and 10550 transitions. [2023-11-24 23:52:33,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:33,071 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 76 [2023-11-24 23:52:33,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:33,099 INFO L225 Difference]: With dead ends: 6744 [2023-11-24 23:52:33,100 INFO L226 Difference]: Without dead ends: 3251 [2023-11-24 23:52:33,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:52:33,126 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 464 mSDsluCounter, 1048 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 466 SdHoareTripleChecker+Valid, 1645 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:33,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [466 Valid, 1645 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-24 23:52:33,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3251 states. [2023-11-24 23:52:33,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3251 to 3236. [2023-11-24 23:52:33,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3236 states, 2317 states have (on average 1.487699611566681) internal successors, (3447), 2446 states have internal predecessors, (3447), 716 states have call successors, (716), 193 states have call predecessors, (716), 202 states have return successors, (871), 692 states have call predecessors, (871), 711 states have call successors, (871) [2023-11-24 23:52:33,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3236 states to 3236 states and 5034 transitions. [2023-11-24 23:52:33,404 INFO L78 Accepts]: Start accepts. Automaton has 3236 states and 5034 transitions. Word has length 76 [2023-11-24 23:52:33,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:33,405 INFO L495 AbstractCegarLoop]: Abstraction has 3236 states and 5034 transitions. [2023-11-24 23:52:33,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-11-24 23:52:33,406 INFO L276 IsEmpty]: Start isEmpty. Operand 3236 states and 5034 transitions. [2023-11-24 23:52:33,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-11-24 23:52:33,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:33,409 INFO L195 NwaCegarLoop]: trace histogram [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 23:52:33,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:33,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:33,622 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:33,622 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:33,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1614842970, now seen corresponding path program 1 times [2023-11-24 23:52:33,623 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:33,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504406969] [2023-11-24 23:52:33,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:33,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:33,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:34,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-24 23:52:34,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:34,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504406969] [2023-11-24 23:52:34,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504406969] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:34,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684941260] [2023-11-24 23:52:34,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:34,022 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:34,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:34,023 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:34,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 23:52:34,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:34,467 INFO L262 TraceCheckSpWp]: Trace formula consists of 1546 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-24 23:52:34,471 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:34,606 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 23:52:34,607 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:34,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684941260] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:34,607 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:34,607 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-11-24 23:52:34,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506811991] [2023-11-24 23:52:34,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:34,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:52:34,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:34,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:52:34,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:34,609 INFO L87 Difference]: Start difference. First operand 3236 states and 5034 transitions. Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2023-11-24 23:52:35,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:35,466 INFO L93 Difference]: Finished difference Result 5912 states and 9220 transitions. [2023-11-24 23:52:35,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:52:35,467 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) Word has length 79 [2023-11-24 23:52:35,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:35,498 INFO L225 Difference]: With dead ends: 5912 [2023-11-24 23:52:35,499 INFO L226 Difference]: Without dead ends: 3257 [2023-11-24 23:52:35,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:52:35,515 INFO L413 NwaCegarLoop]: 663 mSDtfsCounter, 407 mSDsluCounter, 1686 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 2349 SdHoareTripleChecker+Invalid, 368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:35,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [407 Valid, 2349 Invalid, 368 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:52:35,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3257 states. [2023-11-24 23:52:35,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3257 to 3240. [2023-11-24 23:52:35,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3240 states, 2317 states have (on average 1.487699611566681) internal successors, (3447), 2450 states have internal predecessors, (3447), 720 states have call successors, (720), 193 states have call predecessors, (720), 202 states have return successors, (875), 692 states have call predecessors, (875), 715 states have call successors, (875) [2023-11-24 23:52:35,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3240 states to 3240 states and 5042 transitions. [2023-11-24 23:52:35,827 INFO L78 Accepts]: Start accepts. Automaton has 3240 states and 5042 transitions. Word has length 79 [2023-11-24 23:52:35,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:35,827 INFO L495 AbstractCegarLoop]: Abstraction has 3240 states and 5042 transitions. [2023-11-24 23:52:35,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2023-11-24 23:52:35,829 INFO L276 IsEmpty]: Start isEmpty. Operand 3240 states and 5042 transitions. [2023-11-24 23:52:35,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-24 23:52:35,834 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:35,834 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:52:35,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:36,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:36,043 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:36,044 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:36,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1754005972, now seen corresponding path program 1 times [2023-11-24 23:52:36,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:36,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682210581] [2023-11-24 23:52:36,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:36,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:36,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:36,492 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 23:52:36,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:36,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682210581] [2023-11-24 23:52:36,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682210581] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:36,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950972861] [2023-11-24 23:52:36,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:36,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:36,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:36,496 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:36,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-24 23:52:36,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:36,885 INFO L262 TraceCheckSpWp]: Trace formula consists of 1618 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-24 23:52:36,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:36,930 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 23:52:36,930 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:36,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950972861] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:36,931 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:36,931 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-11-24 23:52:36,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523155701] [2023-11-24 23:52:36,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:36,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 23:52:36,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:36,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 23:52:36,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:36,934 INFO L87 Difference]: Start difference. First operand 3240 states and 5042 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2023-11-24 23:52:37,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:37,375 INFO L93 Difference]: Finished difference Result 6173 states and 9739 transitions. [2023-11-24 23:52:37,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:37,375 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) Word has length 99 [2023-11-24 23:52:37,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:37,407 INFO L225 Difference]: With dead ends: 6173 [2023-11-24 23:52:37,407 INFO L226 Difference]: Without dead ends: 3375 [2023-11-24 23:52:37,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:37,428 INFO L413 NwaCegarLoop]: 558 mSDtfsCounter, 13 mSDsluCounter, 1646 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2204 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:37,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 2204 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:52:37,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3375 states. [2023-11-24 23:52:37,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3375 to 3321. [2023-11-24 23:52:37,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3321 states, 2369 states have (on average 1.477838750527649) internal successors, (3501), 2517 states have internal predecessors, (3501), 727 states have call successors, (727), 193 states have call predecessors, (727), 224 states have return successors, (974), 706 states have call predecessors, (974), 722 states have call successors, (974) [2023-11-24 23:52:37,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3321 states to 3321 states and 5202 transitions. [2023-11-24 23:52:37,773 INFO L78 Accepts]: Start accepts. Automaton has 3321 states and 5202 transitions. Word has length 99 [2023-11-24 23:52:37,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:37,774 INFO L495 AbstractCegarLoop]: Abstraction has 3321 states and 5202 transitions. [2023-11-24 23:52:37,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2023-11-24 23:52:37,774 INFO L276 IsEmpty]: Start isEmpty. Operand 3321 states and 5202 transitions. [2023-11-24 23:52:37,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-24 23:52:37,782 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:37,783 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:52:37,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-24 23:52:37,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-24 23:52:37,991 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:37,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:37,991 INFO L85 PathProgramCache]: Analyzing trace with hash -1548783417, now seen corresponding path program 1 times [2023-11-24 23:52:37,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:37,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987983051] [2023-11-24 23:52:37,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:37,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:38,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:38,387 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-24 23:52:38,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:38,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987983051] [2023-11-24 23:52:38,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987983051] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:38,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616128980] [2023-11-24 23:52:38,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:38,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:38,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:38,389 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:38,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-24 23:52:38,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:38,839 INFO L262 TraceCheckSpWp]: Trace formula consists of 1849 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 23:52:38,845 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:38,984 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:52:38,984 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:38,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616128980] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:38,985 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:38,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 16 [2023-11-24 23:52:38,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283449419] [2023-11-24 23:52:38,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:38,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-24 23:52:38,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:38,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-24 23:52:38,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:52:38,987 INFO L87 Difference]: Start difference. First operand 3321 states and 5202 transitions. Second operand has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2023-11-24 23:52:42,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:42,483 INFO L93 Difference]: Finished difference Result 7429 states and 11843 transitions. [2023-11-24 23:52:42,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-24 23:52:42,484 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) Word has length 117 [2023-11-24 23:52:42,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:42,533 INFO L225 Difference]: With dead ends: 7429 [2023-11-24 23:52:42,534 INFO L226 Difference]: Without dead ends: 4004 [2023-11-24 23:52:42,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=592, Unknown=0, NotChecked=0, Total=702 [2023-11-24 23:52:42,549 INFO L413 NwaCegarLoop]: 393 mSDtfsCounter, 1324 mSDsluCounter, 1271 mSDsCounter, 0 mSdLazyCounter, 3105 mSolverCounterSat, 713 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1405 SdHoareTripleChecker+Valid, 1664 SdHoareTripleChecker+Invalid, 3818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 713 IncrementalHoareTripleChecker+Valid, 3105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:42,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1405 Valid, 1664 Invalid, 3818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [713 Valid, 3105 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-11-24 23:52:42,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4004 states. [2023-11-24 23:52:42,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4004 to 3402. [2023-11-24 23:52:42,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3402 states, 2417 states have (on average 1.4745552337608605) internal successors, (3564), 2570 states have internal predecessors, (3564), 759 states have call successors, (759), 193 states have call predecessors, (759), 225 states have return successors, (1058), 734 states have call predecessors, (1058), 754 states have call successors, (1058) [2023-11-24 23:52:42,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3402 states to 3402 states and 5381 transitions. [2023-11-24 23:52:42,893 INFO L78 Accepts]: Start accepts. Automaton has 3402 states and 5381 transitions. Word has length 117 [2023-11-24 23:52:42,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:42,894 INFO L495 AbstractCegarLoop]: Abstraction has 3402 states and 5381 transitions. [2023-11-24 23:52:42,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2023-11-24 23:52:42,894 INFO L276 IsEmpty]: Start isEmpty. Operand 3402 states and 5381 transitions. [2023-11-24 23:52:42,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-11-24 23:52:42,903 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:42,903 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:52:42,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:43,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-24 23:52:43,112 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:43,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:43,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1179640271, now seen corresponding path program 1 times [2023-11-24 23:52:43,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:43,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505006488] [2023-11-24 23:52:43,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:43,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:43,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:43,501 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-24 23:52:43,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:43,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505006488] [2023-11-24 23:52:43,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505006488] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:43,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670295577] [2023-11-24 23:52:43,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:43,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:43,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:43,503 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:43,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-24 23:52:43,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:43,916 INFO L262 TraceCheckSpWp]: Trace formula consists of 1860 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-24 23:52:43,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-24 23:52:43,995 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:43,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670295577] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:43,996 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:43,996 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-11-24 23:52:43,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922039281] [2023-11-24 23:52:43,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:43,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:52:43,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:43,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:52:43,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:43,998 INFO L87 Difference]: Start difference. First operand 3402 states and 5381 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2023-11-24 23:52:44,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:44,621 INFO L93 Difference]: Finished difference Result 7972 states and 12833 transitions. [2023-11-24 23:52:44,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:52:44,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 118 [2023-11-24 23:52:44,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:44,661 INFO L225 Difference]: With dead ends: 7972 [2023-11-24 23:52:44,661 INFO L226 Difference]: Without dead ends: 4582 [2023-11-24 23:52:44,678 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-24 23:52:44,678 INFO L413 NwaCegarLoop]: 724 mSDtfsCounter, 456 mSDsluCounter, 532 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 1256 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:44,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [456 Valid, 1256 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 23:52:44,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4582 states. [2023-11-24 23:52:45,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4582 to 4514. [2023-11-24 23:52:45,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4514 states, 3215 states have (on average 1.4762052877138414) internal successors, (4746), 3424 states have internal predecessors, (4746), 1000 states have call successors, (1000), 252 states have call predecessors, (1000), 298 states have return successors, (1397), 969 states have call predecessors, (1397), 995 states have call successors, (1397) [2023-11-24 23:52:45,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4514 states to 4514 states and 7143 transitions. [2023-11-24 23:52:45,053 INFO L78 Accepts]: Start accepts. Automaton has 4514 states and 7143 transitions. Word has length 118 [2023-11-24 23:52:45,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:45,054 INFO L495 AbstractCegarLoop]: Abstraction has 4514 states and 7143 transitions. [2023-11-24 23:52:45,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2023-11-24 23:52:45,054 INFO L276 IsEmpty]: Start isEmpty. Operand 4514 states and 7143 transitions. [2023-11-24 23:52:45,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-24 23:52:45,064 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:45,065 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-11-24 23:52:45,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:45,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-24 23:52:45,274 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:45,275 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:45,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1795050091, now seen corresponding path program 1 times [2023-11-24 23:52:45,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:45,276 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740396199] [2023-11-24 23:52:45,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:45,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:45,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:45,719 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-24 23:52:45,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:45,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740396199] [2023-11-24 23:52:45,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740396199] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:45,720 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858854607] [2023-11-24 23:52:45,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:45,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:45,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:45,724 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:45,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-24 23:52:46,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:46,155 INFO L262 TraceCheckSpWp]: Trace formula consists of 1875 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-24 23:52:46,161 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:46,234 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:52:46,234 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:46,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858854607] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:46,235 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:46,235 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2023-11-24 23:52:46,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740286273] [2023-11-24 23:52:46,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:46,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:52:46,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:46,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:52:46,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:52:46,238 INFO L87 Difference]: Start difference. First operand 4514 states and 7143 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-11-24 23:52:47,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:47,475 INFO L93 Difference]: Finished difference Result 9052 states and 14658 transitions. [2023-11-24 23:52:47,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:47,476 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 123 [2023-11-24 23:52:47,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:47,508 INFO L225 Difference]: With dead ends: 9052 [2023-11-24 23:52:47,509 INFO L226 Difference]: Without dead ends: 5383 [2023-11-24 23:52:47,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:52:47,527 INFO L413 NwaCegarLoop]: 578 mSDtfsCounter, 568 mSDsluCounter, 727 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 573 SdHoareTripleChecker+Valid, 1305 SdHoareTripleChecker+Invalid, 554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:47,527 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [573 Valid, 1305 Invalid, 554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-24 23:52:47,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5383 states. [2023-11-24 23:52:47,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5383 to 5268. [2023-11-24 23:52:47,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5268 states, 3651 states have (on average 1.4708299096138044) internal successors, (5370), 3906 states have internal predecessors, (5370), 1255 states have call successors, (1255), 324 states have call predecessors, (1255), 361 states have return successors, (1705), 1217 states have call predecessors, (1705), 1248 states have call successors, (1705) [2023-11-24 23:52:47,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 8330 transitions. [2023-11-24 23:52:47,970 INFO L78 Accepts]: Start accepts. Automaton has 5268 states and 8330 transitions. Word has length 123 [2023-11-24 23:52:47,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:47,970 INFO L495 AbstractCegarLoop]: Abstraction has 5268 states and 8330 transitions. [2023-11-24 23:52:47,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-11-24 23:52:47,971 INFO L276 IsEmpty]: Start isEmpty. Operand 5268 states and 8330 transitions. [2023-11-24 23:52:47,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-11-24 23:52:47,983 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:47,983 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:52:48,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-11-24 23:52:48,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-24 23:52:48,192 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:48,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:48,192 INFO L85 PathProgramCache]: Analyzing trace with hash 641753077, now seen corresponding path program 1 times [2023-11-24 23:52:48,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:48,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989155869] [2023-11-24 23:52:48,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:48,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:48,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:48,635 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-24 23:52:48,635 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:48,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989155869] [2023-11-24 23:52:48,636 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989155869] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:48,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094816270] [2023-11-24 23:52:48,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:48,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:48,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:48,638 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:48,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-24 23:52:49,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:49,066 INFO L262 TraceCheckSpWp]: Trace formula consists of 1877 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-24 23:52:49,072 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:52:49,133 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-24 23:52:49,133 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:52:49,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094816270] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:52:49,134 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:52:49,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2023-11-24 23:52:49,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805391911] [2023-11-24 23:52:49,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:52:49,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 23:52:49,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:52:49,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 23:52:49,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:52:49,136 INFO L87 Difference]: Start difference. First operand 5268 states and 8330 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-11-24 23:52:50,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:52:50,617 INFO L93 Difference]: Finished difference Result 12628 states and 20403 transitions. [2023-11-24 23:52:50,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 23:52:50,618 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 124 [2023-11-24 23:52:50,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:52:50,675 INFO L225 Difference]: With dead ends: 12628 [2023-11-24 23:52:50,675 INFO L226 Difference]: Without dead ends: 8183 [2023-11-24 23:52:50,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-11-24 23:52:50,711 INFO L413 NwaCegarLoop]: 894 mSDtfsCounter, 520 mSDsluCounter, 1067 mSDsCounter, 0 mSdLazyCounter, 584 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 1961 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:52:50,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [529 Valid, 1961 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 584 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-24 23:52:50,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8183 states. [2023-11-24 23:52:51,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8183 to 8167. [2023-11-24 23:52:51,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8167 states, 5550 states have (on average 1.4742342342342343) internal successors, (8182), 5976 states have internal predecessors, (8182), 2059 states have call successors, (2059), 518 states have call predecessors, (2059), 557 states have return successors, (2683), 1996 states have call predecessors, (2683), 2048 states have call successors, (2683) [2023-11-24 23:52:51,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8167 states to 8167 states and 12924 transitions. [2023-11-24 23:52:51,536 INFO L78 Accepts]: Start accepts. Automaton has 8167 states and 12924 transitions. Word has length 124 [2023-11-24 23:52:51,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:52:51,539 INFO L495 AbstractCegarLoop]: Abstraction has 8167 states and 12924 transitions. [2023-11-24 23:52:51,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-11-24 23:52:51,539 INFO L276 IsEmpty]: Start isEmpty. Operand 8167 states and 12924 transitions. [2023-11-24 23:52:51,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-11-24 23:52:51,560 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:52:51,561 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:52:51,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-24 23:52:51,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:51,775 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:52:51,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:52:51,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1627873713, now seen corresponding path program 1 times [2023-11-24 23:52:51,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:52:51,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495319570] [2023-11-24 23:52:51,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:51,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:52:51,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:52,171 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-24 23:52:52,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:52:52,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495319570] [2023-11-24 23:52:52,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495319570] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:52:52,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478725606] [2023-11-24 23:52:52,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:52:52,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:52:52,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:52:52,173 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:52:52,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcd6898a-fb69-4ee6-9c82-b534a5326a49/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-24 23:52:52,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:52:52,607 INFO L262 TraceCheckSpWp]: Trace formula consists of 1878 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-24 23:52:52,616 INFO L285 TraceCheckSpWp]: Computing forward predicates...