./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh --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 27587b975a36272f97d565edc796c457ff04a64b538fe9933b800d0dda8dcceb --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 08:26:17,512 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 08:26:17,593 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 08:26:17,599 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 08:26:17,599 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 08:26:17,623 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 08:26:17,623 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 08:26:17,624 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 08:26:17,625 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 08:26:17,625 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 08:26:17,626 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 08:26:17,626 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 08:26:17,627 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 08:26:17,627 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 08:26:17,628 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 08:26:17,628 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 08:26:17,629 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 08:26:17,629 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 08:26:17,630 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 08:26:17,630 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 08:26:17,631 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 08:26:17,633 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 08:26:17,634 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 08:26:17,634 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 08:26:17,635 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 08:26:17,635 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 08:26:17,635 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 08:26:17,636 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 08:26:17,636 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 08:26:17,636 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 08:26:17,637 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 08:26:17,637 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 08:26:17,637 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 08:26:17,638 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 08:26:17,638 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 08:26:17,638 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 08:26:17,638 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 08:26:17,639 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:26:17,639 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 08:26:17,639 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 08:26:17,639 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 08:26:17,640 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 08:26:17,641 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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 27587b975a36272f97d565edc796c457ff04a64b538fe9933b800d0dda8dcceb [2023-12-02 08:26:17,871 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 08:26:17,893 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 08:26:17,896 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 08:26:17,897 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 08:26:17,898 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 08:26:17,899 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c [2023-12-02 08:26:20,629 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 08:26:21,157 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 08:26:21,158 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c [2023-12-02 08:26:21,201 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/data/8ee3baa80/1735028e255d4eab9773ef6454dbc04c/FLAG1961f5603 [2023-12-02 08:26:21,216 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/data/8ee3baa80/1735028e255d4eab9773ef6454dbc04c [2023-12-02 08:26:21,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 08:26:21,220 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 08:26:21,221 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 08:26:21,221 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 08:26:21,226 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 08:26:21,227 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:26:21" (1/1) ... [2023-12-02 08:26:21,228 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ba8a835 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:21, skipping insertion in model container [2023-12-02 08:26:21,229 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 08:26:21" (1/1) ... [2023-12-02 08:26:21,465 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 08:26:23,261 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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[380323,380336] [2023-12-02 08:26:23,299 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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[383339,383352] [2023-12-02 08:26:23,486 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:26:23,498 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 08:26:24,503 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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[380323,380336] [2023-12-02 08:26:24,509 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_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[383339,383352] [2023-12-02 08:26:24,523 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 08:26:24,602 INFO L206 MainTranslator]: Completed translation [2023-12-02 08:26:24,602 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24 WrapperNode [2023-12-02 08:26:24,603 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 08:26:24,604 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 08:26:24,604 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 08:26:24,604 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 08:26:24,611 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:24,708 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,010 INFO L138 Inliner]: procedures = 54, calls = 57, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 12814 [2023-12-02 08:26:25,011 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 08:26:25,012 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 08:26:25,012 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 08:26:25,012 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 08:26:25,021 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,021 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,075 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,076 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,290 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,337 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,389 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,408 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,452 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 08:26:25,453 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 08:26:25,454 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 08:26:25,454 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 08:26:25,455 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (1/1) ... [2023-12-02 08:26:25,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 08:26:25,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:25,483 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 08:26:25,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 08:26:25,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 08:26:25,519 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 08:26:25,519 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 08:26:25,519 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 08:26:25,519 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 08:26:25,519 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 08:26:25,520 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 08:26:25,520 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 08:26:25,520 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 08:26:25,520 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 08:26:25,520 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 08:26:25,521 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 08:26:25,521 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 08:26:25,521 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 08:26:25,521 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 08:26:25,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 08:26:25,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 08:26:25,522 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 08:26:25,671 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 08:26:25,674 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 08:26:33,184 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 08:26:35,066 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 08:26:35,066 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 08:26:35,069 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:26:35 BoogieIcfgContainer [2023-12-02 08:26:35,069 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 08:26:35,072 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 08:26:35,072 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 08:26:35,076 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 08:26:35,076 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 08:26:21" (1/3) ... [2023-12-02 08:26:35,077 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6276b0f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:26:35, skipping insertion in model container [2023-12-02 08:26:35,077 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 08:26:24" (2/3) ... [2023-12-02 08:26:35,077 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6276b0f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 08:26:35, skipping insertion in model container [2023-12-02 08:26:35,078 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 08:26:35" (3/3) ... [2023-12-02 08:26:35,079 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.05.cil-2.c [2023-12-02 08:26:35,100 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 08:26:35,101 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 08:26:35,184 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 08:26:35,189 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;@60c1cb46, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 08:26:35,189 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 08:26:35,201 INFO L276 IsEmpty]: Start isEmpty. Operand has 1766 states, 1735 states have (on average 1.9671469740634007) internal successors, (3413), 1740 states have internal predecessors, (3413), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2023-12-02 08:26:35,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 08:26:35,209 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:35,210 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:26:35,210 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:35,214 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:35,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1724318920, now seen corresponding path program 1 times [2023-12-02 08:26:35,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:35,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863026425] [2023-12-02 08:26:35,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:35,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:35,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:35,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:26:35,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:35,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863026425] [2023-12-02 08:26:35,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863026425] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:35,587 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:26:35,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:26:35,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895837462] [2023-12-02 08:26:35,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:35,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:26:35,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:35,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:26:35,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:26:35,626 INFO L87 Difference]: Start difference. First operand has 1766 states, 1735 states have (on average 1.9671469740634007) internal successors, (3413), 1740 states have internal predecessors, (3413), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 08:26:36,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:36,452 INFO L93 Difference]: Finished difference Result 3631 states and 7073 transitions. [2023-12-02 08:26:36,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:26:36,454 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 47 [2023-12-02 08:26:36,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:36,480 INFO L225 Difference]: With dead ends: 3631 [2023-12-02 08:26:36,480 INFO L226 Difference]: Without dead ends: 1864 [2023-12-02 08:26:36,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:26:36,492 INFO L413 NwaCegarLoop]: 3320 mSDtfsCounter, 3568 mSDsluCounter, 3248 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3568 SdHoareTripleChecker+Valid, 6568 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:36,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3568 Valid, 6568 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:26:36,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1864 states. [2023-12-02 08:26:36,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1864 to 1863. [2023-12-02 08:26:36,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1813 states have (on average 1.9382239382239381) internal successors, (3514), 1817 states have internal predecessors, (3514), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2023-12-02 08:26:36,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3584 transitions. [2023-12-02 08:26:36,625 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3584 transitions. Word has length 47 [2023-12-02 08:26:36,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:36,626 INFO L495 AbstractCegarLoop]: Abstraction has 1863 states and 3584 transitions. [2023-12-02 08:26:36,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 08:26:36,626 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3584 transitions. [2023-12-02 08:26:36,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 08:26:36,633 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:36,633 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 08:26:36,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 08:26:36,634 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:36,634 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:36,634 INFO L85 PathProgramCache]: Analyzing trace with hash 457707900, now seen corresponding path program 1 times [2023-12-02 08:26:36,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:36,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272624340] [2023-12-02 08:26:36,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:36,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:36,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:36,855 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 08:26:36,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:36,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272624340] [2023-12-02 08:26:36,856 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272624340] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:36,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147533275] [2023-12-02 08:26:36,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:36,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:36,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:36,858 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:36,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 08:26:37,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:37,030 INFO L262 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:37,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:37,095 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 08:26:37,095 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:37,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147533275] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:37,096 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:37,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 08:26:37,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030362494] [2023-12-02 08:26:37,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:37,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:37,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:37,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:37,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:37,099 INFO L87 Difference]: Start difference. First operand 1863 states and 3584 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:37,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:37,555 INFO L93 Difference]: Finished difference Result 2290 states and 4205 transitions. [2023-12-02 08:26:37,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:37,556 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-12-02 08:26:37,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:37,572 INFO L225 Difference]: With dead ends: 2290 [2023-12-02 08:26:37,573 INFO L226 Difference]: Without dead ends: 2073 [2023-12-02 08:26:37,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:37,576 INFO L413 NwaCegarLoop]: 3243 mSDtfsCounter, 3413 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3413 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:37,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3413 Valid, 3376 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:37,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2073 states. [2023-12-02 08:26:37,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2073 to 2067. [2023-12-02 08:26:37,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2067 states, 1977 states have (on average 1.8942842690945878) internal successors, (3745), 1982 states have internal predecessors, (3745), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2023-12-02 08:26:37,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2067 states to 2067 states and 3871 transitions. [2023-12-02 08:26:37,656 INFO L78 Accepts]: Start accepts. Automaton has 2067 states and 3871 transitions. Word has length 89 [2023-12-02 08:26:37,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:37,657 INFO L495 AbstractCegarLoop]: Abstraction has 2067 states and 3871 transitions. [2023-12-02 08:26:37,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:37,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2067 states and 3871 transitions. [2023-12-02 08:26:37,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 08:26:37,661 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:37,661 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 08:26:37,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 08:26:37,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 08:26:37,865 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:37,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:37,865 INFO L85 PathProgramCache]: Analyzing trace with hash 18779006, now seen corresponding path program 1 times [2023-12-02 08:26:37,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:37,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92252446] [2023-12-02 08:26:37,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:37,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:37,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:38,026 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 08:26:38,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:38,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92252446] [2023-12-02 08:26:38,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92252446] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:38,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957472244] [2023-12-02 08:26:38,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:38,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:38,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:38,029 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:38,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 08:26:38,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:38,187 INFO L262 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:38,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:38,244 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 08:26:38,245 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:38,245 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957472244] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:38,245 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:38,245 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 08:26:38,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450529461] [2023-12-02 08:26:38,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:38,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:38,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:38,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:38,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:38,248 INFO L87 Difference]: Start difference. First operand 2067 states and 3871 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:38,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:38,709 INFO L93 Difference]: Finished difference Result 2896 states and 5070 transitions. [2023-12-02 08:26:38,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:38,712 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-12-02 08:26:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:38,729 INFO L225 Difference]: With dead ends: 2896 [2023-12-02 08:26:38,729 INFO L226 Difference]: Without dead ends: 2475 [2023-12-02 08:26:38,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:38,733 INFO L413 NwaCegarLoop]: 3197 mSDtfsCounter, 3407 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3407 SdHoareTripleChecker+Valid, 3330 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:38,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3407 Valid, 3330 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:38,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2023-12-02 08:26:38,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2467. [2023-12-02 08:26:38,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2467 states, 2299 states have (on average 1.8247063940843846) internal successors, (4195), 2306 states have internal predecessors, (4195), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2023-12-02 08:26:38,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2467 states to 2467 states and 4429 transitions. [2023-12-02 08:26:38,833 INFO L78 Accepts]: Start accepts. Automaton has 2467 states and 4429 transitions. Word has length 89 [2023-12-02 08:26:38,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:38,833 INFO L495 AbstractCegarLoop]: Abstraction has 2467 states and 4429 transitions. [2023-12-02 08:26:38,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:38,834 INFO L276 IsEmpty]: Start isEmpty. Operand 2467 states and 4429 transitions. [2023-12-02 08:26:38,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 08:26:38,837 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:38,837 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 08:26:38,843 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 08:26:39,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:39,043 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:39,043 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:39,044 INFO L85 PathProgramCache]: Analyzing trace with hash -1076809984, now seen corresponding path program 1 times [2023-12-02 08:26:39,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:39,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923757460] [2023-12-02 08:26:39,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:39,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:39,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:39,133 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 08:26:39,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:39,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923757460] [2023-12-02 08:26:39,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923757460] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:39,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310232997] [2023-12-02 08:26:39,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:39,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:39,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:39,135 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:39,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 08:26:39,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:39,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:39,293 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:39,395 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 08:26:39,396 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:39,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310232997] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:39,396 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:39,396 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 08:26:39,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581134126] [2023-12-02 08:26:39,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:39,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:39,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:39,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:39,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:39,398 INFO L87 Difference]: Start difference. First operand 2467 states and 4429 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:39,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:39,873 INFO L93 Difference]: Finished difference Result 4084 states and 6750 transitions. [2023-12-02 08:26:39,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:39,873 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-12-02 08:26:39,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:39,894 INFO L225 Difference]: With dead ends: 4084 [2023-12-02 08:26:39,895 INFO L226 Difference]: Without dead ends: 3263 [2023-12-02 08:26:39,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:39,900 INFO L413 NwaCegarLoop]: 3197 mSDtfsCounter, 3416 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3416 SdHoareTripleChecker+Valid, 3330 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:39,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3416 Valid, 3330 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:39,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3263 states. [2023-12-02 08:26:40,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3263 to 3251. [2023-12-02 08:26:40,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3251 states, 2931 states have (on average 1.7301262367792563) internal successors, (5071), 2942 states have internal predecessors, (5071), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2023-12-02 08:26:40,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3251 states to 3251 states and 5513 transitions. [2023-12-02 08:26:40,033 INFO L78 Accepts]: Start accepts. Automaton has 3251 states and 5513 transitions. Word has length 89 [2023-12-02 08:26:40,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:40,033 INFO L495 AbstractCegarLoop]: Abstraction has 3251 states and 5513 transitions. [2023-12-02 08:26:40,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 08:26:40,033 INFO L276 IsEmpty]: Start isEmpty. Operand 3251 states and 5513 transitions. [2023-12-02 08:26:40,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 08:26:40,038 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:40,038 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-12-02 08:26:40,043 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 08:26:40,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:40,238 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:40,239 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:40,239 INFO L85 PathProgramCache]: Analyzing trace with hash 967925182, now seen corresponding path program 1 times [2023-12-02 08:26:40,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:40,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711102884] [2023-12-02 08:26:40,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:40,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:40,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:40,308 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 08:26:40,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:40,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711102884] [2023-12-02 08:26:40,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711102884] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:40,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:26:40,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:26:40,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528151672] [2023-12-02 08:26:40,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:40,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:40,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:40,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:40,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:40,311 INFO L87 Difference]: Start difference. First operand 3251 states and 5513 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 08:26:40,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:40,820 INFO L93 Difference]: Finished difference Result 4527 states and 7340 transitions. [2023-12-02 08:26:40,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:40,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-12-02 08:26:40,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:40,840 INFO L225 Difference]: With dead ends: 4527 [2023-12-02 08:26:40,840 INFO L226 Difference]: Without dead ends: 3691 [2023-12-02 08:26:40,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:40,845 INFO L413 NwaCegarLoop]: 3271 mSDtfsCounter, 69 mSDsluCounter, 3203 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 6474 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:40,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 6474 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:40,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3691 states. [2023-12-02 08:26:40,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3691 to 3543. [2023-12-02 08:26:40,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3543 states, 3207 states have (on average 1.7159338946055505) internal successors, (5503), 3218 states have internal predecessors, (5503), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2023-12-02 08:26:40,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3543 states to 3543 states and 5961 transitions. [2023-12-02 08:26:40,944 INFO L78 Accepts]: Start accepts. Automaton has 3543 states and 5961 transitions. Word has length 89 [2023-12-02 08:26:40,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:40,945 INFO L495 AbstractCegarLoop]: Abstraction has 3543 states and 5961 transitions. [2023-12-02 08:26:40,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 08:26:40,945 INFO L276 IsEmpty]: Start isEmpty. Operand 3543 states and 5961 transitions. [2023-12-02 08:26:40,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 08:26:40,950 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:40,950 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:40,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 08:26:40,951 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:40,951 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:40,951 INFO L85 PathProgramCache]: Analyzing trace with hash -676709825, now seen corresponding path program 1 times [2023-12-02 08:26:40,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:40,951 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216959119] [2023-12-02 08:26:40,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:40,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:41,015 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 08:26:41,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:41,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216959119] [2023-12-02 08:26:41,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216959119] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:41,016 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:26:41,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:26:41,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656220361] [2023-12-02 08:26:41,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:41,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:41,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:41,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:41,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:41,018 INFO L87 Difference]: Start difference. First operand 3543 states and 5961 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:26:41,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:41,481 INFO L93 Difference]: Finished difference Result 7264 states and 11306 transitions. [2023-12-02 08:26:41,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:41,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-12-02 08:26:41,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:41,507 INFO L225 Difference]: With dead ends: 7264 [2023-12-02 08:26:41,507 INFO L226 Difference]: Without dead ends: 5367 [2023-12-02 08:26:41,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:41,514 INFO L413 NwaCegarLoop]: 3199 mSDtfsCounter, 3406 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3406 SdHoareTripleChecker+Valid, 3332 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:41,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3406 Valid, 3332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:26:41,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5367 states. [2023-12-02 08:26:41,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5367 to 5339. [2023-12-02 08:26:41,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5339 states, 4691 states have (on average 1.6147942869324239) internal successors, (7575), 4710 states have internal predecessors, (7575), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2023-12-02 08:26:41,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5339 states to 5339 states and 8449 transitions. [2023-12-02 08:26:41,666 INFO L78 Accepts]: Start accepts. Automaton has 5339 states and 8449 transitions. Word has length 119 [2023-12-02 08:26:41,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:41,667 INFO L495 AbstractCegarLoop]: Abstraction has 5339 states and 8449 transitions. [2023-12-02 08:26:41,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:26:41,667 INFO L276 IsEmpty]: Start isEmpty. Operand 5339 states and 8449 transitions. [2023-12-02 08:26:41,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 08:26:41,675 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:41,675 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:41,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 08:26:41,676 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:41,676 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:41,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1406948987, now seen corresponding path program 1 times [2023-12-02 08:26:41,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:41,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138538986] [2023-12-02 08:26:41,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:41,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:41,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:41,731 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 08:26:41,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:41,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138538986] [2023-12-02 08:26:41,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138538986] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:41,731 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:26:41,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 08:26:41,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378941938] [2023-12-02 08:26:41,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:41,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:41,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:41,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:41,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:41,733 INFO L87 Difference]: Start difference. First operand 5339 states and 8449 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:26:42,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:42,331 INFO L93 Difference]: Finished difference Result 12580 states and 18730 transitions. [2023-12-02 08:26:42,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:42,331 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-12-02 08:26:42,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:42,386 INFO L225 Difference]: With dead ends: 12580 [2023-12-02 08:26:42,386 INFO L226 Difference]: Without dead ends: 8887 [2023-12-02 08:26:42,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 08:26:42,402 INFO L413 NwaCegarLoop]: 3224 mSDtfsCounter, 3409 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 3357 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:42,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3409 Valid, 3357 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:42,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8887 states. [2023-12-02 08:26:42,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8887 to 8835. [2023-12-02 08:26:42,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8835 states, 7579 states have (on average 1.5251352421163742) internal successors, (11559), 7614 states have internal predecessors, (11559), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2023-12-02 08:26:42,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8835 states to 8835 states and 13233 transitions. [2023-12-02 08:26:42,768 INFO L78 Accepts]: Start accepts. Automaton has 8835 states and 13233 transitions. Word has length 119 [2023-12-02 08:26:42,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:42,768 INFO L495 AbstractCegarLoop]: Abstraction has 8835 states and 13233 transitions. [2023-12-02 08:26:42,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:26:42,770 INFO L276 IsEmpty]: Start isEmpty. Operand 8835 states and 13233 transitions. [2023-12-02 08:26:42,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 08:26:42,796 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:42,796 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:42,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 08:26:42,797 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:42,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:42,797 INFO L85 PathProgramCache]: Analyzing trace with hash -103866291, now seen corresponding path program 1 times [2023-12-02 08:26:42,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:42,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002996316] [2023-12-02 08:26:42,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:42,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:42,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:42,943 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 1 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 08:26:42,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:42,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002996316] [2023-12-02 08:26:42,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002996316] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:42,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878074344] [2023-12-02 08:26:42,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:42,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:42,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:42,946 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:42,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 08:26:43,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:43,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:43,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 08:26:43,149 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:43,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878074344] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:43,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:43,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 08:26:43,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517189393] [2023-12-02 08:26:43,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:43,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:43,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:43,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:43,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:43,152 INFO L87 Difference]: Start difference. First operand 8835 states and 13233 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:43,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:43,880 INFO L93 Difference]: Finished difference Result 14891 states and 21879 transitions. [2023-12-02 08:26:43,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:43,881 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 08:26:43,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:43,913 INFO L225 Difference]: With dead ends: 14891 [2023-12-02 08:26:43,913 INFO L226 Difference]: Without dead ends: 11199 [2023-12-02 08:26:43,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:43,925 INFO L413 NwaCegarLoop]: 3267 mSDtfsCounter, 84 mSDsluCounter, 3202 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 6469 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:43,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 6469 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:43,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11199 states. [2023-12-02 08:26:44,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11199 to 10363. [2023-12-02 08:26:44,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10363 states, 9011 states have (on average 1.526023748751526) internal successors, (13751), 9046 states have internal predecessors, (13751), 886 states have call successors, (886), 465 states have call predecessors, (886), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2023-12-02 08:26:44,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10363 states to 10363 states and 15521 transitions. [2023-12-02 08:26:44,326 INFO L78 Accepts]: Start accepts. Automaton has 10363 states and 15521 transitions. Word has length 135 [2023-12-02 08:26:44,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:44,326 INFO L495 AbstractCegarLoop]: Abstraction has 10363 states and 15521 transitions. [2023-12-02 08:26:44,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:44,327 INFO L276 IsEmpty]: Start isEmpty. Operand 10363 states and 15521 transitions. [2023-12-02 08:26:44,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 08:26:44,352 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:44,353 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:44,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 08:26:44,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 08:26:44,554 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:44,554 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:44,554 INFO L85 PathProgramCache]: Analyzing trace with hash 570010696, now seen corresponding path program 1 times [2023-12-02 08:26:44,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:44,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449015058] [2023-12-02 08:26:44,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:44,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:44,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:44,723 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 08:26:44,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:44,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449015058] [2023-12-02 08:26:44,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449015058] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:44,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083323209] [2023-12-02 08:26:44,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:44,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:44,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:44,725 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:44,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 08:26:44,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:44,898 INFO L262 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:44,902 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:44,929 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 08:26:44,930 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:44,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083323209] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:44,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:44,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 08:26:44,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773991864] [2023-12-02 08:26:44,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:44,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:44,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:44,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:44,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:44,932 INFO L87 Difference]: Start difference. First operand 10363 states and 15521 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:45,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:45,700 INFO L93 Difference]: Finished difference Result 18051 states and 26527 transitions. [2023-12-02 08:26:45,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:45,701 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 08:26:45,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:45,734 INFO L225 Difference]: With dead ends: 18051 [2023-12-02 08:26:45,735 INFO L226 Difference]: Without dead ends: 13607 [2023-12-02 08:26:45,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:45,746 INFO L413 NwaCegarLoop]: 3296 mSDtfsCounter, 96 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 6500 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:45,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 6500 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:45,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13607 states. [2023-12-02 08:26:46,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13607 to 12547. [2023-12-02 08:26:46,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12547 states, 11051 states have (on average 1.5223056736946883) internal successors, (16823), 11086 states have internal predecessors, (16823), 958 states have call successors, (958), 537 states have call predecessors, (958), 536 states have return successors, (956), 924 states have call predecessors, (956), 956 states have call successors, (956) [2023-12-02 08:26:46,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12547 states to 12547 states and 18737 transitions. [2023-12-02 08:26:46,120 INFO L78 Accepts]: Start accepts. Automaton has 12547 states and 18737 transitions. Word has length 135 [2023-12-02 08:26:46,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:46,120 INFO L495 AbstractCegarLoop]: Abstraction has 12547 states and 18737 transitions. [2023-12-02 08:26:46,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:46,120 INFO L276 IsEmpty]: Start isEmpty. Operand 12547 states and 18737 transitions. [2023-12-02 08:26:46,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 08:26:46,143 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:46,143 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:46,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 08:26:46,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 08:26:46,344 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:46,344 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:46,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1871584949, now seen corresponding path program 1 times [2023-12-02 08:26:46,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:46,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789729828] [2023-12-02 08:26:46,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:46,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:46,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:46,440 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-12-02 08:26:46,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:46,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789729828] [2023-12-02 08:26:46,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789729828] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:46,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22001096] [2023-12-02 08:26:46,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:46,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:46,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:46,442 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:46,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 08:26:46,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:46,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:26:46,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:46,633 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 08:26:46,633 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:26:46,633 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22001096] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:26:46,633 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:26:46,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 08:26:46,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144741321] [2023-12-02 08:26:46,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:26:46,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:26:46,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:26:46,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:26:46,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:46,635 INFO L87 Difference]: Start difference. First operand 12547 states and 18737 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:47,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:26:47,350 INFO L93 Difference]: Finished difference Result 22531 states and 33139 transitions. [2023-12-02 08:26:47,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:26:47,350 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-12-02 08:26:47,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:26:47,388 INFO L225 Difference]: With dead ends: 22531 [2023-12-02 08:26:47,388 INFO L226 Difference]: Without dead ends: 16923 [2023-12-02 08:26:47,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:26:47,401 INFO L413 NwaCegarLoop]: 3301 mSDtfsCounter, 102 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 6505 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:26:47,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 6505 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:26:47,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16923 states. [2023-12-02 08:26:47,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16923 to 15751. [2023-12-02 08:26:47,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15751 states, 14039 states have (on average 1.5162760880404587) internal successors, (21287), 14074 states have internal predecessors, (21287), 1066 states have call successors, (1066), 645 states have call predecessors, (1066), 644 states have return successors, (1064), 1032 states have call predecessors, (1064), 1064 states have call successors, (1064) [2023-12-02 08:26:47,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15751 states to 15751 states and 23417 transitions. [2023-12-02 08:26:47,943 INFO L78 Accepts]: Start accepts. Automaton has 15751 states and 23417 transitions. Word has length 135 [2023-12-02 08:26:47,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:26:47,943 INFO L495 AbstractCegarLoop]: Abstraction has 15751 states and 23417 transitions. [2023-12-02 08:26:47,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:26:47,943 INFO L276 IsEmpty]: Start isEmpty. Operand 15751 states and 23417 transitions. [2023-12-02 08:26:47,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 08:26:47,981 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:26:47,981 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:26:47,987 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 08:26:48,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 08:26:48,182 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:26:48,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:26:48,182 INFO L85 PathProgramCache]: Analyzing trace with hash -797953878, now seen corresponding path program 1 times [2023-12-02 08:26:48,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:26:48,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709647993] [2023-12-02 08:26:48,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:48,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:26:48,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:48,555 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 08:26:48,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:26:48,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709647993] [2023-12-02 08:26:48,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709647993] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:26:48,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229420328] [2023-12-02 08:26:48,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:26:48,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:26:48,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:26:48,557 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:26:48,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 08:26:48,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:26:48,748 INFO L262 TraceCheckSpWp]: Trace formula consists of 815 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 08:26:48,752 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:26:48,914 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 64 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 08:26:48,915 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:26:49,264 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 38 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 08:26:49,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229420328] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:26:49,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1120283335] [2023-12-02 08:26:49,287 INFO L159 IcfgInterpreter]: Started Sifa with 75 locations of interest [2023-12-02 08:26:49,287 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:26:49,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:26:49,296 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:26:49,296 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:27:31,600 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 08:27:31,602 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 169 for LOIs [2023-12-02 08:27:31,745 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 181 for LOIs [2023-12-02 08:27:31,944 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 144 for LOIs [2023-12-02 08:27:32,047 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 147 for LOIs [2023-12-02 08:27:32,159 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 34 for LOIs [2023-12-02 08:27:32,227 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 16 for LOIs [2023-12-02 08:27:32,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:27:40,956 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191035#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 08:27:40,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:27:40,956 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:27:40,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 9 [2023-12-02 08:27:40,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528921769] [2023-12-02 08:27:40,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:27:40,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 08:27:40,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:27:40,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 08:27:40,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=4060, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 08:27:40,959 INFO L87 Difference]: Start difference. First operand 15751 states and 23417 transitions. Second operand has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 08:27:42,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:27:42,275 INFO L93 Difference]: Finished difference Result 35467 states and 51535 transitions. [2023-12-02 08:27:42,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 08:27:42,276 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) Word has length 139 [2023-12-02 08:27:42,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:27:42,332 INFO L225 Difference]: With dead ends: 35467 [2023-12-02 08:27:42,332 INFO L226 Difference]: Without dead ends: 21363 [2023-12-02 08:27:42,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 358 SyntacticMatches, 9 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2244 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=423, Invalid=4833, Unknown=0, NotChecked=0, Total=5256 [2023-12-02 08:27:42,367 INFO L413 NwaCegarLoop]: 3216 mSDtfsCounter, 7065 mSDsluCounter, 6484 mSDsCounter, 0 mSdLazyCounter, 888 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7087 SdHoareTripleChecker+Valid, 9700 SdHoareTripleChecker+Invalid, 1009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:27:42,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7087 Valid, 9700 Invalid, 1009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 888 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 08:27:42,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21363 states. [2023-12-02 08:27:42,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21363 to 20751. [2023-12-02 08:27:42,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20751 states, 18311 states have (on average 1.4871388782698924) internal successors, (27231), 18362 states have internal predecessors, (27231), 1526 states have call successors, (1526), 913 states have call predecessors, (1526), 912 states have return successors, (1524), 1476 states have call predecessors, (1524), 1524 states have call successors, (1524) [2023-12-02 08:27:42,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20751 states to 20751 states and 30281 transitions. [2023-12-02 08:27:42,982 INFO L78 Accepts]: Start accepts. Automaton has 20751 states and 30281 transitions. Word has length 139 [2023-12-02 08:27:42,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:27:42,982 INFO L495 AbstractCegarLoop]: Abstraction has 20751 states and 30281 transitions. [2023-12-02 08:27:42,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 16.0) internal successors, (144), 9 states have internal predecessors, (144), 5 states have call successors, (29), 6 states have call predecessors, (29), 7 states have return successors, (30), 6 states have call predecessors, (30), 5 states have call successors, (30) [2023-12-02 08:27:42,982 INFO L276 IsEmpty]: Start isEmpty. Operand 20751 states and 30281 transitions. [2023-12-02 08:27:43,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 08:27:43,007 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:27:43,008 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:27:43,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 08:27:43,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 08:27:43,208 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:27:43,209 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:27:43,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1979321037, now seen corresponding path program 2 times [2023-12-02 08:27:43,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:27:43,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481986497] [2023-12-02 08:27:43,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:43,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:27:43,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:43,480 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:27:43,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:27:43,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481986497] [2023-12-02 08:27:43,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481986497] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:27:43,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786470965] [2023-12-02 08:27:43,480 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:27:43,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:43,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:27:43,481 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:27:43,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 08:27:43,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 08:27:43,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:27:43,630 INFO L262 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:27:43,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:27:43,651 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 08:27:43,651 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:27:43,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786470965] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:27:43,652 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:27:43,652 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 08:27:43,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634240063] [2023-12-02 08:27:43,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:27:43,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:27:43,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:27:43,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:27:43,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:43,654 INFO L87 Difference]: Start difference. First operand 20751 states and 30281 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:44,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:27:44,579 INFO L93 Difference]: Finished difference Result 34599 states and 50427 transitions. [2023-12-02 08:27:44,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:27:44,580 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2023-12-02 08:27:44,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:27:44,616 INFO L225 Difference]: With dead ends: 34599 [2023-12-02 08:27:44,616 INFO L226 Difference]: Without dead ends: 20787 [2023-12-02 08:27:44,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:44,637 INFO L413 NwaCegarLoop]: 3277 mSDtfsCounter, 152 mSDsluCounter, 3190 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 6467 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:27:44,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 6467 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:27:44,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20787 states. [2023-12-02 08:27:45,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20787 to 20599. [2023-12-02 08:27:45,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20599 states, 18159 states have (on average 1.4757971253923674) internal successors, (26799), 18210 states have internal predecessors, (26799), 1526 states have call successors, (1526), 913 states have call predecessors, (1526), 912 states have return successors, (1524), 1476 states have call predecessors, (1524), 1524 states have call successors, (1524) [2023-12-02 08:27:45,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20599 states to 20599 states and 29849 transitions. [2023-12-02 08:27:45,501 INFO L78 Accepts]: Start accepts. Automaton has 20599 states and 29849 transitions. Word has length 135 [2023-12-02 08:27:45,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:27:45,501 INFO L495 AbstractCegarLoop]: Abstraction has 20599 states and 29849 transitions. [2023-12-02 08:27:45,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:45,501 INFO L276 IsEmpty]: Start isEmpty. Operand 20599 states and 29849 transitions. [2023-12-02 08:27:45,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 08:27:45,522 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:27:45,522 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:27:45,527 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 08:27:45,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 08:27:45,723 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:27:45,723 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:27:45,724 INFO L85 PathProgramCache]: Analyzing trace with hash 318371501, now seen corresponding path program 1 times [2023-12-02 08:27:45,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:27:45,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774871373] [2023-12-02 08:27:45,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:45,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:27:45,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:45,981 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:27:45,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:27:45,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774871373] [2023-12-02 08:27:45,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774871373] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:27:45,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875849138] [2023-12-02 08:27:45,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:45,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:45,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:27:45,983 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:27:45,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 08:27:46,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:46,142 INFO L262 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:27:46,145 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:27:46,163 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 08:27:46,163 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:27:46,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875849138] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:27:46,163 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:27:46,163 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 08:27:46,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155831074] [2023-12-02 08:27:46,163 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:27:46,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:27:46,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:27:46,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:27:46,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:46,165 INFO L87 Difference]: Start difference. First operand 20599 states and 29849 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:47,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:27:47,045 INFO L93 Difference]: Finished difference Result 35623 states and 50782 transitions. [2023-12-02 08:27:47,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:27:47,046 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2023-12-02 08:27:47,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:27:47,099 INFO L225 Difference]: With dead ends: 35623 [2023-12-02 08:27:47,099 INFO L226 Difference]: Without dead ends: 23099 [2023-12-02 08:27:47,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:47,124 INFO L413 NwaCegarLoop]: 3216 mSDtfsCounter, 3418 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3418 SdHoareTripleChecker+Valid, 3250 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:27:47,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3418 Valid, 3250 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:27:47,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23099 states. [2023-12-02 08:27:47,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23099 to 23099. [2023-12-02 08:27:47,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23099 states, 20379 states have (on average 1.4451641395554247) internal successors, (29451), 20430 states have internal predecessors, (29451), 1618 states have call successors, (1618), 1101 states have call predecessors, (1618), 1100 states have return successors, (1616), 1568 states have call predecessors, (1616), 1616 states have call successors, (1616) [2023-12-02 08:27:47,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23099 states to 23099 states and 32685 transitions. [2023-12-02 08:27:47,843 INFO L78 Accepts]: Start accepts. Automaton has 23099 states and 32685 transitions. Word has length 135 [2023-12-02 08:27:47,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:27:47,844 INFO L495 AbstractCegarLoop]: Abstraction has 23099 states and 32685 transitions. [2023-12-02 08:27:47,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:47,844 INFO L276 IsEmpty]: Start isEmpty. Operand 23099 states and 32685 transitions. [2023-12-02 08:27:47,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 08:27:47,865 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:27:47,866 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:27:47,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 08:27:48,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:48,066 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:27:48,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:27:48,067 INFO L85 PathProgramCache]: Analyzing trace with hash 644936598, now seen corresponding path program 1 times [2023-12-02 08:27:48,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:27:48,067 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112376120] [2023-12-02 08:27:48,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:48,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:27:48,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:48,288 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 10 proven. 38 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:27:48,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:27:48,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112376120] [2023-12-02 08:27:48,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112376120] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:27:48,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437854405] [2023-12-02 08:27:48,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:48,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:48,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:27:48,290 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:27:48,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 08:27:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:48,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:27:48,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:27:48,476 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 08:27:48,476 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:27:48,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437854405] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:27:48,477 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:27:48,477 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 08:27:48,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589044923] [2023-12-02 08:27:48,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:27:48,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:27:48,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:27:48,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:27:48,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:48,478 INFO L87 Difference]: Start difference. First operand 23099 states and 32685 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:49,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:27:49,750 INFO L93 Difference]: Finished difference Result 54603 states and 76660 transitions. [2023-12-02 08:27:49,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:27:49,750 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 136 [2023-12-02 08:27:49,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:27:49,813 INFO L225 Difference]: With dead ends: 54603 [2023-12-02 08:27:49,813 INFO L226 Difference]: Without dead ends: 33151 [2023-12-02 08:27:49,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:27:49,846 INFO L413 NwaCegarLoop]: 3213 mSDtfsCounter, 80 mSDsluCounter, 3181 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 6394 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:27:49,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 6394 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:27:49,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33151 states. [2023-12-02 08:27:50,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33151 to 27295. [2023-12-02 08:27:50,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27295 states, 24283 states have (on average 1.4511798377465717) internal successors, (35239), 24335 states have internal predecessors, (35239), 1764 states have call successors, (1764), 1247 states have call predecessors, (1764), 1246 states have return successors, (1762), 1713 states have call predecessors, (1762), 1762 states have call successors, (1762) [2023-12-02 08:27:50,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27295 states to 27295 states and 38765 transitions. [2023-12-02 08:27:50,832 INFO L78 Accepts]: Start accepts. Automaton has 27295 states and 38765 transitions. Word has length 136 [2023-12-02 08:27:50,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:27:50,832 INFO L495 AbstractCegarLoop]: Abstraction has 27295 states and 38765 transitions. [2023-12-02 08:27:50,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:27:50,832 INFO L276 IsEmpty]: Start isEmpty. Operand 27295 states and 38765 transitions. [2023-12-02 08:27:50,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 08:27:50,860 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:27:50,860 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:27:50,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 08:27:51,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:51,061 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:27:51,061 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:27:51,061 INFO L85 PathProgramCache]: Analyzing trace with hash 270528751, now seen corresponding path program 1 times [2023-12-02 08:27:51,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:27:51,061 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686944381] [2023-12-02 08:27:51,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:51,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:27:51,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-12-02 08:27:51,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:27:51,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686944381] [2023-12-02 08:27:51,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686944381] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:27:51,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488446325] [2023-12-02 08:27:51,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:27:51,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:27:51,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:27:51,356 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:27:51,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 08:27:51,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:27:51,543 INFO L262 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 08:27:51,548 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:27:51,654 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:27:51,654 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:27:53,243 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 08:27:53,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488446325] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:27:53,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74477838] [2023-12-02 08:27:53,247 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2023-12-02 08:27:53,247 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:27:53,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:27:53,248 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:27:53,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:28:02,229 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 08:28:02,231 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 155 for LOIs [2023-12-02 08:28:02,323 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 08:28:02,439 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 08:28:02,440 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 08:28:02,453 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 08:28:02,529 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 08:28:02,640 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:28:13,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '491372#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 08:28:13,342 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:28:13,342 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:28:13,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 6] total 16 [2023-12-02 08:28:13,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217719981] [2023-12-02 08:28:13,342 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:28:13,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 08:28:13,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:13,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 08:28:13,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=5147, Unknown=0, NotChecked=0, Total=5550 [2023-12-02 08:28:13,346 INFO L87 Difference]: Start difference. First operand 27295 states and 38765 transitions. Second operand has 16 states, 14 states have (on average 12.142857142857142) internal successors, (170), 14 states have internal predecessors, (170), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 08:28:21,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:21,339 INFO L93 Difference]: Finished difference Result 88480 states and 126388 transitions. [2023-12-02 08:28:21,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2023-12-02 08:28:21,340 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 12.142857142857142) internal successors, (170), 14 states have internal predecessors, (170), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) Word has length 141 [2023-12-02 08:28:21,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:21,451 INFO L225 Difference]: With dead ends: 88480 [2023-12-02 08:28:21,451 INFO L226 Difference]: Without dead ends: 62832 [2023-12-02 08:28:21,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 416 SyntacticMatches, 4 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13801 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=2767, Invalid=33523, Unknown=0, NotChecked=0, Total=36290 [2023-12-02 08:28:21,491 INFO L413 NwaCegarLoop]: 3711 mSDtfsCounter, 11843 mSDsluCounter, 29238 mSDsCounter, 0 mSdLazyCounter, 4766 mSolverCounterSat, 435 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11849 SdHoareTripleChecker+Valid, 32949 SdHoareTripleChecker+Invalid, 5201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 435 IncrementalHoareTripleChecker+Valid, 4766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:21,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11849 Valid, 32949 Invalid, 5201 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [435 Valid, 4766 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2023-12-02 08:28:21,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62832 states. [2023-12-02 08:28:23,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62832 to 43529. [2023-12-02 08:28:23,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43529 states, 39284 states have (on average 1.4225893493534263) internal successors, (55885), 39356 states have internal predecessors, (55885), 2331 states have call successors, (2331), 1913 states have call predecessors, (2331), 1912 states have return successors, (2329), 2260 states have call predecessors, (2329), 2329 states have call successors, (2329) [2023-12-02 08:28:23,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43529 states to 43529 states and 60545 transitions. [2023-12-02 08:28:23,327 INFO L78 Accepts]: Start accepts. Automaton has 43529 states and 60545 transitions. Word has length 141 [2023-12-02 08:28:23,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:23,328 INFO L495 AbstractCegarLoop]: Abstraction has 43529 states and 60545 transitions. [2023-12-02 08:28:23,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 12.142857142857142) internal successors, (170), 14 states have internal predecessors, (170), 8 states have call successors, (34), 5 states have call predecessors, (34), 6 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2023-12-02 08:28:23,328 INFO L276 IsEmpty]: Start isEmpty. Operand 43529 states and 60545 transitions. [2023-12-02 08:28:23,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 08:28:23,365 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:23,365 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:23,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 08:28:23,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:23,566 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:23,566 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:23,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1041730948, now seen corresponding path program 1 times [2023-12-02 08:28:23,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:23,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085661027] [2023-12-02 08:28:23,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:23,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:23,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:23,753 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 15 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 08:28:23,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:23,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085661027] [2023-12-02 08:28:23,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085661027] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:23,753 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475672046] [2023-12-02 08:28:23,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:23,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:23,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:23,755 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:23,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 08:28:23,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:23,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 08:28:23,922 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:23,952 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 08:28:23,952 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:23,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475672046] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:23,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:23,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 08:28:23,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973720000] [2023-12-02 08:28:23,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:23,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:28:23,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:23,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:28:23,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-12-02 08:28:23,953 INFO L87 Difference]: Start difference. First operand 43529 states and 60545 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:28:25,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:25,711 INFO L93 Difference]: Finished difference Result 61522 states and 85196 transitions. [2023-12-02 08:28:25,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:28:25,711 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 142 [2023-12-02 08:28:25,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:25,780 INFO L225 Difference]: With dead ends: 61522 [2023-12-02 08:28:25,780 INFO L226 Difference]: Without dead ends: 44584 [2023-12-02 08:28:25,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:28:25,803 INFO L413 NwaCegarLoop]: 3256 mSDtfsCounter, 3376 mSDsluCounter, 3391 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3376 SdHoareTripleChecker+Valid, 6647 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:25,803 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3376 Valid, 6647 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:28:25,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44584 states. [2023-12-02 08:28:27,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44584 to 44401. [2023-12-02 08:28:27,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44401 states, 40060 states have (on average 1.4195956065901147) internal successors, (56869), 40180 states have internal predecessors, (56869), 2331 states have call successors, (2331), 1913 states have call predecessors, (2331), 2008 states have return successors, (2425), 2308 states have call predecessors, (2425), 2329 states have call successors, (2425) [2023-12-02 08:28:27,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44401 states to 44401 states and 61625 transitions. [2023-12-02 08:28:27,501 INFO L78 Accepts]: Start accepts. Automaton has 44401 states and 61625 transitions. Word has length 142 [2023-12-02 08:28:27,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:27,501 INFO L495 AbstractCegarLoop]: Abstraction has 44401 states and 61625 transitions. [2023-12-02 08:28:27,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:28:27,501 INFO L276 IsEmpty]: Start isEmpty. Operand 44401 states and 61625 transitions. [2023-12-02 08:28:27,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 08:28:27,537 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:27,537 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:27,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 08:28:27,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:27,738 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:27,738 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:27,738 INFO L85 PathProgramCache]: Analyzing trace with hash -29275577, now seen corresponding path program 1 times [2023-12-02 08:28:27,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:27,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587930667] [2023-12-02 08:28:27,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:27,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:27,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:27,870 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 08:28:27,870 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:27,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587930667] [2023-12-02 08:28:27,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587930667] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:27,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102390339] [2023-12-02 08:28:27,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:27,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:27,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:27,872 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:27,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 08:28:28,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:28,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:28:28,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 08:28:28,056 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:28,056 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102390339] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:28,056 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:28,056 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 08:28:28,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591223003] [2023-12-02 08:28:28,057 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:28,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:28:28,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:28,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:28:28,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:28:28,058 INFO L87 Difference]: Start difference. First operand 44401 states and 61625 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:28:29,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:29,847 INFO L93 Difference]: Finished difference Result 61655 states and 85504 transitions. [2023-12-02 08:28:29,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:28:29,847 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 143 [2023-12-02 08:28:29,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:29,910 INFO L225 Difference]: With dead ends: 61655 [2023-12-02 08:28:29,910 INFO L226 Difference]: Without dead ends: 43361 [2023-12-02 08:28:29,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:28:29,931 INFO L413 NwaCegarLoop]: 3215 mSDtfsCounter, 34 mSDsluCounter, 3195 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 6410 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:29,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 6410 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:28:29,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43361 states. [2023-12-02 08:28:31,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43361 to 41865. [2023-12-02 08:28:31,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41865 states, 37812 states have (on average 1.4278271448217497) internal successors, (53989), 37860 states have internal predecessors, (53989), 2235 states have call successors, (2235), 1817 states have call predecessors, (2235), 1816 states have return successors, (2233), 2188 states have call predecessors, (2233), 2233 states have call successors, (2233) [2023-12-02 08:28:31,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41865 states to 41865 states and 58457 transitions. [2023-12-02 08:28:31,595 INFO L78 Accepts]: Start accepts. Automaton has 41865 states and 58457 transitions. Word has length 143 [2023-12-02 08:28:31,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:31,595 INFO L495 AbstractCegarLoop]: Abstraction has 41865 states and 58457 transitions. [2023-12-02 08:28:31,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:28:31,595 INFO L276 IsEmpty]: Start isEmpty. Operand 41865 states and 58457 transitions. [2023-12-02 08:28:31,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 08:28:31,627 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:31,628 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:31,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 08:28:31,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 08:28:31,829 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:31,829 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:31,829 INFO L85 PathProgramCache]: Analyzing trace with hash 968401974, now seen corresponding path program 1 times [2023-12-02 08:28:31,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:31,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319239579] [2023-12-02 08:28:31,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:31,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:31,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:32,061 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 23 proven. 37 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 08:28:32,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:32,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319239579] [2023-12-02 08:28:32,062 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319239579] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:32,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118344577] [2023-12-02 08:28:32,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:32,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:32,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:32,064 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:32,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 08:28:32,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:32,241 INFO L262 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 08:28:32,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:32,313 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 08:28:32,313 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:32,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118344577] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:32,313 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:32,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 08:28:32,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823404252] [2023-12-02 08:28:32,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:32,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:28:32,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:32,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:28:32,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:28:32,315 INFO L87 Difference]: Start difference. First operand 41865 states and 58457 transitions. Second operand has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:28:35,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:35,301 INFO L93 Difference]: Finished difference Result 95596 states and 132114 transitions. [2023-12-02 08:28:35,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 08:28:35,302 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 144 [2023-12-02 08:28:35,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:35,400 INFO L225 Difference]: With dead ends: 95596 [2023-12-02 08:28:35,400 INFO L226 Difference]: Without dead ends: 55428 [2023-12-02 08:28:35,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-12-02 08:28:35,435 INFO L413 NwaCegarLoop]: 3195 mSDtfsCounter, 3667 mSDsluCounter, 6375 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3681 SdHoareTripleChecker+Valid, 9570 SdHoareTripleChecker+Invalid, 918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:35,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3681 Valid, 9570 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 08:28:35,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55428 states. [2023-12-02 08:28:37,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55428 to 55424. [2023-12-02 08:28:37,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55424 states, 49813 states have (on average 1.40666091181017) internal successors, (70070), 49882 states have internal predecessors, (70070), 3096 states have call successors, (3096), 2514 states have call predecessors, (3096), 2513 states have return successors, (3094), 3028 states have call predecessors, (3094), 3094 states have call successors, (3094) [2023-12-02 08:28:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55424 states to 55424 states and 76260 transitions. [2023-12-02 08:28:37,843 INFO L78 Accepts]: Start accepts. Automaton has 55424 states and 76260 transitions. Word has length 144 [2023-12-02 08:28:37,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:37,843 INFO L495 AbstractCegarLoop]: Abstraction has 55424 states and 76260 transitions. [2023-12-02 08:28:37,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.166666666666668) internal successors, (97), 6 states have internal predecessors, (97), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:28:37,844 INFO L276 IsEmpty]: Start isEmpty. Operand 55424 states and 76260 transitions. [2023-12-02 08:28:37,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 08:28:37,886 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:37,886 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:37,891 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 08:28:38,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 08:28:38,088 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:38,089 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:38,089 INFO L85 PathProgramCache]: Analyzing trace with hash -402168924, now seen corresponding path program 1 times [2023-12-02 08:28:38,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:38,090 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048246094] [2023-12-02 08:28:38,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:38,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:38,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:38,256 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 39 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:28:38,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:38,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048246094] [2023-12-02 08:28:38,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048246094] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:38,257 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2043472783] [2023-12-02 08:28:38,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:38,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:38,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:38,258 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:38,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 08:28:38,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:38,390 INFO L262 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:28:38,392 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:38,428 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 92 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 08:28:38,428 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:38,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2043472783] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:38,429 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:38,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 08:28:38,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479220436] [2023-12-02 08:28:38,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:38,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:28:38,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:38,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:28:38,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:28:38,430 INFO L87 Difference]: Start difference. First operand 55424 states and 76260 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:28:40,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:40,924 INFO L93 Difference]: Finished difference Result 94351 states and 130422 transitions. [2023-12-02 08:28:40,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:28:40,925 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 148 [2023-12-02 08:28:40,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:41,012 INFO L225 Difference]: With dead ends: 94351 [2023-12-02 08:28:41,013 INFO L226 Difference]: Without dead ends: 55506 [2023-12-02 08:28:41,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:28:41,051 INFO L413 NwaCegarLoop]: 3309 mSDtfsCounter, 131 mSDsluCounter, 3189 mSDsCounter, 0 mSdLazyCounter, 503 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 6498 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:41,051 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 6498 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:28:41,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55506 states. [2023-12-02 08:28:43,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55506 to 54888. [2023-12-02 08:28:43,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54888 states, 49277 states have (on average 1.3910343567993182) internal successors, (68546), 49346 states have internal predecessors, (68546), 3096 states have call successors, (3096), 2514 states have call predecessors, (3096), 2513 states have return successors, (3094), 3028 states have call predecessors, (3094), 3094 states have call successors, (3094) [2023-12-02 08:28:43,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54888 states to 54888 states and 74736 transitions. [2023-12-02 08:28:43,537 INFO L78 Accepts]: Start accepts. Automaton has 54888 states and 74736 transitions. Word has length 148 [2023-12-02 08:28:43,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:43,537 INFO L495 AbstractCegarLoop]: Abstraction has 54888 states and 74736 transitions. [2023-12-02 08:28:43,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:28:43,538 INFO L276 IsEmpty]: Start isEmpty. Operand 54888 states and 74736 transitions. [2023-12-02 08:28:43,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 08:28:43,584 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:43,585 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:43,590 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 08:28:43,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:43,785 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:43,786 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:43,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1116519620, now seen corresponding path program 1 times [2023-12-02 08:28:43,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:43,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149256249] [2023-12-02 08:28:43,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:43,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:43,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:43,917 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:28:43,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:43,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149256249] [2023-12-02 08:28:43,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149256249] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:43,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95992617] [2023-12-02 08:28:43,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:43,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:43,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:43,919 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:43,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 08:28:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:44,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 08:28:44,108 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:44,187 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 08:28:44,187 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:44,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95992617] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:44,187 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:44,187 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 08:28:44,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898225588] [2023-12-02 08:28:44,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:44,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:28:44,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:44,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:28:44,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 08:28:44,189 INFO L87 Difference]: Start difference. First operand 54888 states and 74736 transitions. Second operand has 6 states, 5 states have (on average 20.4) internal successors, (102), 6 states have internal predecessors, (102), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:28:48,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:48,423 INFO L93 Difference]: Finished difference Result 132375 states and 177961 transitions. [2023-12-02 08:28:48,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 08:28:48,423 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 20.4) internal successors, (102), 6 states have internal predecessors, (102), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2023-12-02 08:28:48,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:48,552 INFO L225 Difference]: With dead ends: 132375 [2023-12-02 08:28:48,553 INFO L226 Difference]: Without dead ends: 79184 [2023-12-02 08:28:48,600 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-12-02 08:28:48,601 INFO L413 NwaCegarLoop]: 3193 mSDtfsCounter, 6986 mSDsluCounter, 6301 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7000 SdHoareTripleChecker+Valid, 9494 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:48,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7000 Valid, 9494 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:28:48,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79184 states. [2023-12-02 08:28:52,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79184 to 79180. [2023-12-02 08:28:52,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79180 states, 70821 states have (on average 1.3544146510215895) internal successors, (95921), 70926 states have internal predecessors, (95921), 4584 states have call successors, (4584), 3774 states have call predecessors, (4584), 3773 states have return successors, (4582), 4480 states have call predecessors, (4582), 4582 states have call successors, (4582) [2023-12-02 08:28:52,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79180 states to 79180 states and 105087 transitions. [2023-12-02 08:28:52,779 INFO L78 Accepts]: Start accepts. Automaton has 79180 states and 105087 transitions. Word has length 148 [2023-12-02 08:28:52,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:28:52,780 INFO L495 AbstractCegarLoop]: Abstraction has 79180 states and 105087 transitions. [2023-12-02 08:28:52,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 20.4) internal successors, (102), 6 states have internal predecessors, (102), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:28:52,780 INFO L276 IsEmpty]: Start isEmpty. Operand 79180 states and 105087 transitions. [2023-12-02 08:28:52,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 08:28:52,836 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:28:52,836 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-12-02 08:28:52,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-12-02 08:28:53,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:53,037 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:28:53,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:28:53,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1598447202, now seen corresponding path program 1 times [2023-12-02 08:28:53,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:28:53,037 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825359912] [2023-12-02 08:28:53,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:53,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:28:53,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:53,114 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 08:28:53,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:28:53,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825359912] [2023-12-02 08:28:53,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825359912] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:28:53,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962478094] [2023-12-02 08:28:53,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:28:53,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:28:53,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:28:53,116 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:28:53,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 08:28:53,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:28:53,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:28:53,268 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:28:53,292 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 08:28:53,292 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:28:53,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962478094] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:28:53,292 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:28:53,292 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 08:28:53,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390493749] [2023-12-02 08:28:53,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:28:53,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:28:53,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:28:53,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:28:53,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:28:53,294 INFO L87 Difference]: Start difference. First operand 79180 states and 105087 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:28:58,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:28:58,625 INFO L93 Difference]: Finished difference Result 149043 states and 197994 transitions. [2023-12-02 08:28:58,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:28:58,625 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 148 [2023-12-02 08:28:58,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:28:58,839 INFO L225 Difference]: With dead ends: 149043 [2023-12-02 08:28:58,839 INFO L226 Difference]: Without dead ends: 96503 [2023-12-02 08:28:58,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:28:58,877 INFO L413 NwaCegarLoop]: 3290 mSDtfsCounter, 102 mSDsluCounter, 3203 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 6493 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:28:58,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 6493 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:28:58,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96503 states. [2023-12-02 08:29:03,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96503 to 91292. [2023-12-02 08:29:03,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91292 states, 81744 states have (on average 1.3560628302994715) internal successors, (110850), 81835 states have internal predecessors, (110850), 5175 states have call successors, (5175), 4372 states have call predecessors, (5175), 4371 states have return successors, (5173), 5085 states have call predecessors, (5173), 5173 states have call successors, (5173) [2023-12-02 08:29:03,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91292 states to 91292 states and 121198 transitions. [2023-12-02 08:29:03,405 INFO L78 Accepts]: Start accepts. Automaton has 91292 states and 121198 transitions. Word has length 148 [2023-12-02 08:29:03,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:29:03,405 INFO L495 AbstractCegarLoop]: Abstraction has 91292 states and 121198 transitions. [2023-12-02 08:29:03,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:29:03,405 INFO L276 IsEmpty]: Start isEmpty. Operand 91292 states and 121198 transitions. [2023-12-02 08:29:03,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 08:29:03,469 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:29:03,469 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:29:03,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 08:29:03,670 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:03,670 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:29:03,670 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:29:03,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1120147097, now seen corresponding path program 1 times [2023-12-02 08:29:03,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:29:03,671 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019852989] [2023-12-02 08:29:03,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:29:03,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:29:03,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:29:03,811 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 08:29:03,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:29:03,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019852989] [2023-12-02 08:29:03,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019852989] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:29:03,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192939990] [2023-12-02 08:29:03,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:29:03,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:03,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:29:03,812 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:29:03,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 08:29:03,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:29:03,962 INFO L262 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 08:29:03,966 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:29:04,034 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 08:29:04,034 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:29:04,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192939990] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:29:04,034 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:29:04,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2023-12-02 08:29:04,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701728894] [2023-12-02 08:29:04,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:29:04,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:29:04,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:29:04,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:29:04,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:29:04,036 INFO L87 Difference]: Start difference. First operand 91292 states and 121198 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:29:11,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:29:11,446 INFO L93 Difference]: Finished difference Result 222485 states and 292025 transitions. [2023-12-02 08:29:11,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 08:29:11,447 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 152 [2023-12-02 08:29:11,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:29:11,686 INFO L225 Difference]: With dead ends: 222485 [2023-12-02 08:29:11,686 INFO L226 Difference]: Without dead ends: 132890 [2023-12-02 08:29:11,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-12-02 08:29:11,754 INFO L413 NwaCegarLoop]: 3190 mSDtfsCounter, 7049 mSDsluCounter, 6303 mSDsCounter, 0 mSdLazyCounter, 774 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7063 SdHoareTripleChecker+Valid, 9493 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:29:11,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7063 Valid, 9493 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:29:11,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132890 states. [2023-12-02 08:29:19,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132890 to 132886. [2023-12-02 08:29:19,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132886 states, 118520 states have (on average 1.3164444819439758) internal successors, (156025), 118665 states have internal predecessors, (156025), 7743 states have call successors, (7743), 6622 states have call predecessors, (7743), 6621 states have return successors, (7741), 7599 states have call predecessors, (7741), 7741 states have call successors, (7741) [2023-12-02 08:29:20,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132886 states to 132886 states and 171509 transitions. [2023-12-02 08:29:20,069 INFO L78 Accepts]: Start accepts. Automaton has 132886 states and 171509 transitions. Word has length 152 [2023-12-02 08:29:20,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:29:20,069 INFO L495 AbstractCegarLoop]: Abstraction has 132886 states and 171509 transitions. [2023-12-02 08:29:20,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 08:29:20,069 INFO L276 IsEmpty]: Start isEmpty. Operand 132886 states and 171509 transitions. [2023-12-02 08:29:20,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 08:29:20,172 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:29:20,172 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:29:20,178 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 08:29:20,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:20,373 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:29:20,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:29:20,373 INFO L85 PathProgramCache]: Analyzing trace with hash 2116627754, now seen corresponding path program 1 times [2023-12-02 08:29:20,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:29:20,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189269146] [2023-12-02 08:29:20,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:29:20,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:29:20,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:29:20,495 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 39 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 08:29:20,495 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:29:20,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189269146] [2023-12-02 08:29:20,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189269146] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:29:20,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861913620] [2023-12-02 08:29:20,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:29:20,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:20,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:29:20,497 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:29:20,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 08:29:20,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:29:20,671 INFO L262 TraceCheckSpWp]: Trace formula consists of 781 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 08:29:20,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:29:20,703 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 08:29:20,703 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:29:20,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861913620] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:29:20,703 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:29:20,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-12-02 08:29:20,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640899629] [2023-12-02 08:29:20,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:29:20,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:29:20,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:29:20,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:29:20,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:29:20,705 INFO L87 Difference]: Start difference. First operand 132886 states and 171509 transitions. Second operand has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:29:29,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:29:29,254 INFO L93 Difference]: Finished difference Result 242063 states and 312548 transitions. [2023-12-02 08:29:29,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:29:29,254 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 153 [2023-12-02 08:29:29,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:29:29,540 INFO L225 Difference]: With dead ends: 242063 [2023-12-02 08:29:29,541 INFO L226 Difference]: Without dead ends: 151101 [2023-12-02 08:29:29,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 08:29:29,617 INFO L413 NwaCegarLoop]: 3253 mSDtfsCounter, 3409 mSDsluCounter, 3387 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 6640 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:29:29,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3409 Valid, 6640 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:29:29,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151101 states. [2023-12-02 08:29:37,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151101 to 146648. [2023-12-02 08:29:37,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146648 states, 130092 states have (on average 1.3145543154075576) internal successors, (171013), 130292 states have internal predecessors, (171013), 8869 states have call successors, (8869), 7510 states have call predecessors, (8869), 7685 states have return successors, (9797), 8846 states have call predecessors, (9797), 8867 states have call successors, (9797) [2023-12-02 08:29:38,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146648 states to 146648 states and 189679 transitions. [2023-12-02 08:29:38,014 INFO L78 Accepts]: Start accepts. Automaton has 146648 states and 189679 transitions. Word has length 153 [2023-12-02 08:29:38,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:29:38,015 INFO L495 AbstractCegarLoop]: Abstraction has 146648 states and 189679 transitions. [2023-12-02 08:29:38,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:29:38,015 INFO L276 IsEmpty]: Start isEmpty. Operand 146648 states and 189679 transitions. [2023-12-02 08:29:38,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 08:29:38,150 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:29:38,150 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:29:38,155 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 08:29:38,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:38,351 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:29:38,351 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:29:38,351 INFO L85 PathProgramCache]: Analyzing trace with hash 1631212233, now seen corresponding path program 2 times [2023-12-02 08:29:38,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:29:38,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984639765] [2023-12-02 08:29:38,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:29:38,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:29:38,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:29:38,402 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 46 proven. 13 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 08:29:38,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:29:38,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984639765] [2023-12-02 08:29:38,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984639765] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:29:38,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48895443] [2023-12-02 08:29:38,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:29:38,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:29:38,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:29:38,404 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:29:38,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 08:29:38,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 08:29:38,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:29:38,517 INFO L262 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:29:38,519 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:29:38,553 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 08:29:38,553 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:29:38,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48895443] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:29:38,553 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:29:38,553 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 08:29:38,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848248683] [2023-12-02 08:29:38,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:29:38,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:29:38,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:29:38,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:29:38,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:29:38,555 INFO L87 Difference]: Start difference. First operand 146648 states and 189679 transitions. Second operand has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:29:50,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:29:50,651 INFO L93 Difference]: Finished difference Result 340861 states and 444372 transitions. [2023-12-02 08:29:50,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:29:50,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 153 [2023-12-02 08:29:50,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:29:51,388 INFO L225 Difference]: With dead ends: 340861 [2023-12-02 08:29:51,388 INFO L226 Difference]: Without dead ends: 236150 [2023-12-02 08:29:51,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:29:51,512 INFO L413 NwaCegarLoop]: 3207 mSDtfsCounter, 3397 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3397 SdHoareTripleChecker+Valid, 3338 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:29:51,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3397 Valid, 3338 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:29:51,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236150 states. [2023-12-02 08:30:04,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236150 to 232144. [2023-12-02 08:30:05,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232144 states, 204994 states have (on average 1.303272290896319) internal successors, (267163), 205401 states have internal predecessors, (267163), 14477 states have call successors, (14477), 12264 states have call predecessors, (14477), 12671 states have return successors, (17603), 14479 states have call predecessors, (17603), 14475 states have call successors, (17603) [2023-12-02 08:30:05,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232144 states to 232144 states and 299243 transitions. [2023-12-02 08:30:05,808 INFO L78 Accepts]: Start accepts. Automaton has 232144 states and 299243 transitions. Word has length 153 [2023-12-02 08:30:05,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:30:05,809 INFO L495 AbstractCegarLoop]: Abstraction has 232144 states and 299243 transitions. [2023-12-02 08:30:05,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.333333333333336) internal successors, (118), 3 states have internal predecessors, (118), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:30:05,809 INFO L276 IsEmpty]: Start isEmpty. Operand 232144 states and 299243 transitions. [2023-12-02 08:30:06,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 08:30:06,096 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:30:06,096 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:30:06,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-12-02 08:30:06,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:30:06,297 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:30:06,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:30:06,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1404235080, now seen corresponding path program 1 times [2023-12-02 08:30:06,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:30:06,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564630530] [2023-12-02 08:30:06,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:30:06,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:30:06,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:30:06,361 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 50 proven. 13 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 08:30:06,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:30:06,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564630530] [2023-12-02 08:30:06,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564630530] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:30:06,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532692868] [2023-12-02 08:30:06,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:30:06,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:30:06,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:30:06,363 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:30:06,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 08:30:06,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:30:06,503 INFO L262 TraceCheckSpWp]: Trace formula consists of 780 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:30:06,506 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:30:06,553 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 08:30:06,553 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:30:06,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532692868] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:30:06,554 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:30:06,554 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 08:30:06,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723964369] [2023-12-02 08:30:06,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:30:06,554 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:30:06,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:30:06,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:30:06,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:30:06,555 INFO L87 Difference]: Start difference. First operand 232144 states and 299243 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:30:20,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:30:20,381 INFO L93 Difference]: Finished difference Result 423551 states and 546528 transitions. [2023-12-02 08:30:20,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:30:20,382 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 154 [2023-12-02 08:30:20,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:30:20,951 INFO L225 Difference]: With dead ends: 423551 [2023-12-02 08:30:20,951 INFO L226 Difference]: Without dead ends: 230301 [2023-12-02 08:30:21,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:30:21,144 INFO L413 NwaCegarLoop]: 3220 mSDtfsCounter, 3383 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3383 SdHoareTripleChecker+Valid, 3261 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 08:30:21,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3383 Valid, 3261 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 08:30:21,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230301 states. [2023-12-02 08:30:34,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230301 to 229999. [2023-12-02 08:30:34,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229999 states, 203552 states have (on average 1.2955903159880522) internal successors, (263720), 203913 states have internal predecessors, (263720), 14091 states have call successors, (14091), 12281 states have call predecessors, (14091), 12354 states have return successors, (16667), 13805 states have call predecessors, (16667), 14089 states have call successors, (16667) [2023-12-02 08:30:35,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229999 states to 229999 states and 294478 transitions. [2023-12-02 08:30:35,742 INFO L78 Accepts]: Start accepts. Automaton has 229999 states and 294478 transitions. Word has length 154 [2023-12-02 08:30:35,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:30:35,743 INFO L495 AbstractCegarLoop]: Abstraction has 229999 states and 294478 transitions. [2023-12-02 08:30:35,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 3 states have internal predecessors, (119), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:30:35,743 INFO L276 IsEmpty]: Start isEmpty. Operand 229999 states and 294478 transitions. [2023-12-02 08:30:35,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 08:30:35,964 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:30:35,964 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:30:35,970 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 08:30:36,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 08:30:36,165 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:30:36,165 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:30:36,165 INFO L85 PathProgramCache]: Analyzing trace with hash 1119261241, now seen corresponding path program 1 times [2023-12-02 08:30:36,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:30:36,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629273186] [2023-12-02 08:30:36,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:30:36,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:30:36,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:30:36,225 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 08:30:36,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:30:36,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629273186] [2023-12-02 08:30:36,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629273186] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:30:36,225 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 08:30:36,226 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 08:30:36,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104465462] [2023-12-02 08:30:36,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:30:36,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:30:36,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:30:36,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:30:36,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:30:36,227 INFO L87 Difference]: Start difference. First operand 229999 states and 294478 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:30:45,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:30:45,848 INFO L93 Difference]: Finished difference Result 332626 states and 428601 transitions. [2023-12-02 08:30:45,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:30:45,849 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) Word has length 154 [2023-12-02 08:30:45,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:30:46,210 INFO L225 Difference]: With dead ends: 332626 [2023-12-02 08:30:46,211 INFO L226 Difference]: Without dead ends: 142924 [2023-12-02 08:30:46,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:30:46,333 INFO L413 NwaCegarLoop]: 3319 mSDtfsCounter, 3542 mSDsluCounter, 3249 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3542 SdHoareTripleChecker+Valid, 6568 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 08:30:46,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3542 Valid, 6568 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 08:30:46,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142924 states. [2023-12-02 08:30:55,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142924 to 140427. [2023-12-02 08:30:55,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140427 states, 124558 states have (on average 1.2830247756065447) internal successors, (159811), 124730 states have internal predecessors, (159811), 8521 states have call successors, (8521), 7401 states have call predecessors, (8521), 7346 states have return successors, (8989), 8296 states have call predecessors, (8989), 8519 states have call successors, (8989) [2023-12-02 08:30:55,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140427 states to 140427 states and 177321 transitions. [2023-12-02 08:30:55,376 INFO L78 Accepts]: Start accepts. Automaton has 140427 states and 177321 transitions. Word has length 154 [2023-12-02 08:30:55,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:30:55,377 INFO L495 AbstractCegarLoop]: Abstraction has 140427 states and 177321 transitions. [2023-12-02 08:30:55,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (11), 4 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:30:55,377 INFO L276 IsEmpty]: Start isEmpty. Operand 140427 states and 177321 transitions. [2023-12-02 08:30:55,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 08:30:55,489 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:30:55,489 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:30:55,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-12-02 08:30:55,489 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:30:55,489 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:30:55,490 INFO L85 PathProgramCache]: Analyzing trace with hash 1671416824, now seen corresponding path program 2 times [2023-12-02 08:30:55,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:30:55,490 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079078394] [2023-12-02 08:30:55,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:30:55,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:30:55,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:30:55,974 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 43 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 08:30:55,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:30:55,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079078394] [2023-12-02 08:30:55,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079078394] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:30:55,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888137134] [2023-12-02 08:30:55,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 08:30:55,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:30:55,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:30:55,976 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:30:55,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 08:30:56,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 08:30:56,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 08:30:56,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 08:30:56,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:30:56,345 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 25 proven. 35 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 08:30:56,345 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:30:56,512 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 08:30:56,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888137134] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 08:30:56,512 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 08:30:56,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13, 7] total 21 [2023-12-02 08:30:56,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593862370] [2023-12-02 08:30:56,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:30:56,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:30:56,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:30:56,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:30:56,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2023-12-02 08:30:56,513 INFO L87 Difference]: Start difference. First operand 140427 states and 177321 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:31:05,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:31:05,172 INFO L93 Difference]: Finished difference Result 251653 states and 318670 transitions. [2023-12-02 08:31:05,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 08:31:05,173 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 155 [2023-12-02 08:31:05,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:31:05,493 INFO L225 Difference]: With dead ends: 251653 [2023-12-02 08:31:05,493 INFO L226 Difference]: Without dead ends: 152475 [2023-12-02 08:31:05,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2023-12-02 08:31:05,586 INFO L413 NwaCegarLoop]: 3251 mSDtfsCounter, 3423 mSDsluCounter, 3245 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3423 SdHoareTripleChecker+Valid, 6496 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:31:05,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3423 Valid, 6496 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:31:05,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152475 states. [2023-12-02 08:31:14,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152475 to 151169. [2023-12-02 08:31:14,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151169 states, 134573 states have (on average 1.270589196941437) internal successors, (170987), 134799 states have internal predecessors, (170987), 8668 states have call successors, (8668), 7927 states have call predecessors, (8668), 7926 states have return successors, (9350), 8443 states have call predecessors, (9350), 8666 states have call successors, (9350) [2023-12-02 08:31:15,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151169 states to 151169 states and 189005 transitions. [2023-12-02 08:31:15,201 INFO L78 Accepts]: Start accepts. Automaton has 151169 states and 189005 transitions. Word has length 155 [2023-12-02 08:31:15,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:31:15,201 INFO L495 AbstractCegarLoop]: Abstraction has 151169 states and 189005 transitions. [2023-12-02 08:31:15,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2023-12-02 08:31:15,201 INFO L276 IsEmpty]: Start isEmpty. Operand 151169 states and 189005 transitions. [2023-12-02 08:31:15,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 08:31:15,328 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:31:15,328 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:31:15,333 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 08:31:15,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 08:31:15,529 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:31:15,529 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:31:15,529 INFO L85 PathProgramCache]: Analyzing trace with hash -2032018442, now seen corresponding path program 1 times [2023-12-02 08:31:15,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:31:15,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955112904] [2023-12-02 08:31:15,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:15,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:31:15,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 38 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 08:31:15,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:31:15,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955112904] [2023-12-02 08:31:15,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955112904] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:31:15,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237774338] [2023-12-02 08:31:15,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:15,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:31:15,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:31:15,582 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:31:15,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 08:31:15,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:15,747 INFO L262 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:31:15,749 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:31:15,775 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 08:31:15,775 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:31:15,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237774338] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:31:15,775 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:31:15,775 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 08:31:15,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374670855] [2023-12-02 08:31:15,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:31:15,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:31:15,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:31:15,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:31:15,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:31:15,777 INFO L87 Difference]: Start difference. First operand 151169 states and 189005 transitions. Second operand has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:31:24,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:31:24,860 INFO L93 Difference]: Finished difference Result 257760 states and 324458 transitions. [2023-12-02 08:31:24,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:31:24,860 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 155 [2023-12-02 08:31:24,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:31:25,191 INFO L225 Difference]: With dead ends: 257760 [2023-12-02 08:31:25,191 INFO L226 Difference]: Without dead ends: 150993 [2023-12-02 08:31:25,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 08:31:25,294 INFO L413 NwaCegarLoop]: 3311 mSDtfsCounter, 127 mSDsluCounter, 3188 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 6499 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:31:25,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 6499 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:31:25,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150993 states. [2023-12-02 08:31:34,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150993 to 149091. [2023-12-02 08:31:34,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149091 states, 132507 states have (on average 1.2504320526462753) internal successors, (165691), 132721 states have internal predecessors, (165691), 8668 states have call successors, (8668), 7927 states have call predecessors, (8668), 7914 states have return successors, (9338), 8443 states have call predecessors, (9338), 8666 states have call successors, (9338) [2023-12-02 08:31:34,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149091 states to 149091 states and 183697 transitions. [2023-12-02 08:31:34,857 INFO L78 Accepts]: Start accepts. Automaton has 149091 states and 183697 transitions. Word has length 155 [2023-12-02 08:31:34,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:31:34,858 INFO L495 AbstractCegarLoop]: Abstraction has 149091 states and 183697 transitions. [2023-12-02 08:31:34,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 43.0) internal successors, (129), 3 states have internal predecessors, (129), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:31:34,858 INFO L276 IsEmpty]: Start isEmpty. Operand 149091 states and 183697 transitions. [2023-12-02 08:31:34,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 08:31:34,972 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:31:34,972 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:31:34,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 08:31:35,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 08:31:35,173 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:31:35,173 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:31:35,173 INFO L85 PathProgramCache]: Analyzing trace with hash 2013465930, now seen corresponding path program 1 times [2023-12-02 08:31:35,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:31:35,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635193702] [2023-12-02 08:31:35,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:35,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:31:35,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:35,527 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 48 proven. 31 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 08:31:35,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:31:35,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635193702] [2023-12-02 08:31:35,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635193702] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:31:35,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840935103] [2023-12-02 08:31:35,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:35,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:31:35,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:31:35,529 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:31:35,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 08:31:35,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:35,668 INFO L262 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 08:31:35,670 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:31:35,741 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 104 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 08:31:35,741 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:31:35,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840935103] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:31:35,741 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:31:35,741 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2023-12-02 08:31:35,742 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269818994] [2023-12-02 08:31:35,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:31:35,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:31:35,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:31:35,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:31:35,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2023-12-02 08:31:35,743 INFO L87 Difference]: Start difference. First operand 149091 states and 183697 transitions. Second operand has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 08:31:47,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:31:47,879 INFO L93 Difference]: Finished difference Result 284063 states and 349824 transitions. [2023-12-02 08:31:47,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 08:31:47,880 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 157 [2023-12-02 08:31:47,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:31:48,411 INFO L225 Difference]: With dead ends: 284063 [2023-12-02 08:31:48,411 INFO L226 Difference]: Without dead ends: 182714 [2023-12-02 08:31:48,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2023-12-02 08:31:48,500 INFO L413 NwaCegarLoop]: 3300 mSDtfsCounter, 278 mSDsluCounter, 12653 mSDsCounter, 0 mSdLazyCounter, 1389 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 15953 SdHoareTripleChecker+Invalid, 1438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1389 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 08:31:48,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 15953 Invalid, 1438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1389 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 08:31:48,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182714 states. [2023-12-02 08:31:58,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182714 to 160168. [2023-12-02 08:31:58,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160168 states, 141839 states have (on average 1.2423804454346126) internal successors, (176218), 142076 states have internal predecessors, (176218), 9678 states have call successors, (9678), 8752 states have call predecessors, (9678), 8649 states have return successors, (10612), 9340 states have call predecessors, (10612), 9676 states have call successors, (10612) [2023-12-02 08:31:59,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160168 states to 160168 states and 196508 transitions. [2023-12-02 08:31:59,310 INFO L78 Accepts]: Start accepts. Automaton has 160168 states and 196508 transitions. Word has length 157 [2023-12-02 08:31:59,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:31:59,310 INFO L495 AbstractCegarLoop]: Abstraction has 160168 states and 196508 transitions. [2023-12-02 08:31:59,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.333333333333332) internal successors, (134), 6 states have internal predecessors, (134), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 08:31:59,310 INFO L276 IsEmpty]: Start isEmpty. Operand 160168 states and 196508 transitions. [2023-12-02 08:31:59,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 08:31:59,414 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:31:59,415 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:31:59,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 08:31:59,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 08:31:59,615 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:31:59,615 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:31:59,616 INFO L85 PathProgramCache]: Analyzing trace with hash -77325181, now seen corresponding path program 1 times [2023-12-02 08:31:59,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:31:59,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62944862] [2023-12-02 08:31:59,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:59,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:31:59,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:59,800 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 38 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-12-02 08:31:59,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:31:59,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62944862] [2023-12-02 08:31:59,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62944862] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:31:59,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731259548] [2023-12-02 08:31:59,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:31:59,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:31:59,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:31:59,802 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:31:59,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 08:31:59,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:31:59,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 854 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 08:31:59,957 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:32:00,105 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 74 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:32:00,105 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:32:01,700 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2023-12-02 08:32:01,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731259548] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:32:01,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728477784] [2023-12-02 08:32:01,703 INFO L159 IcfgInterpreter]: Started Sifa with 88 locations of interest [2023-12-02 08:32:01,704 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:32:01,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:32:01,704 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:32:01,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:32:11,895 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 08:32:11,896 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 08:32:11,903 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 08:32:12,018 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 08:32:12,019 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 08:32:12,033 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 08:32:12,106 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 08:32:12,166 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:32:29,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6140951#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 08:32:29,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:32:29,009 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:32:29,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 6] total 17 [2023-12-02 08:32:29,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704581069] [2023-12-02 08:32:29,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:32:29,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 08:32:29,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:32:29,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 08:32:29,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=7384, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 08:32:29,014 INFO L87 Difference]: Start difference. First operand 160168 states and 196508 transitions. Second operand has 17 states, 14 states have (on average 13.357142857142858) internal successors, (187), 15 states have internal predecessors, (187), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:32:55,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:32:55,721 INFO L93 Difference]: Finished difference Result 392736 states and 493150 transitions. [2023-12-02 08:32:55,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2023-12-02 08:32:55,722 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 13.357142857142858) internal successors, (187), 15 states have internal predecessors, (187), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 152 [2023-12-02 08:32:55,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:32:56,367 INFO L225 Difference]: With dead ends: 392736 [2023-12-02 08:32:56,368 INFO L226 Difference]: Without dead ends: 258729 [2023-12-02 08:32:56,704 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 716 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27070 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=4793, Invalid=59469, Unknown=0, NotChecked=0, Total=64262 [2023-12-02 08:32:56,705 INFO L413 NwaCegarLoop]: 4147 mSDtfsCounter, 20614 mSDsluCounter, 24397 mSDsCounter, 0 mSdLazyCounter, 5015 mSolverCounterSat, 686 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20630 SdHoareTripleChecker+Valid, 28544 SdHoareTripleChecker+Invalid, 5701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 686 IncrementalHoareTripleChecker+Valid, 5015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:32:56,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20630 Valid, 28544 Invalid, 5701 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [686 Valid, 5015 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2023-12-02 08:32:56,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258729 states. [2023-12-02 08:33:07,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258729 to 138312. [2023-12-02 08:33:07,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138312 states, 122875 states have (on average 1.240878942014242) internal successors, (152473), 123136 states have internal predecessors, (152473), 8036 states have call successors, (8036), 7466 states have call predecessors, (8036), 7399 states have return successors, (8754), 7710 states have call predecessors, (8754), 8034 states have call successors, (8754) [2023-12-02 08:33:07,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138312 states to 138312 states and 169263 transitions. [2023-12-02 08:33:07,889 INFO L78 Accepts]: Start accepts. Automaton has 138312 states and 169263 transitions. Word has length 152 [2023-12-02 08:33:07,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:33:07,889 INFO L495 AbstractCegarLoop]: Abstraction has 138312 states and 169263 transitions. [2023-12-02 08:33:07,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 13.357142857142858) internal successors, (187), 15 states have internal predecessors, (187), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:33:07,889 INFO L276 IsEmpty]: Start isEmpty. Operand 138312 states and 169263 transitions. [2023-12-02 08:33:07,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 08:33:07,973 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:33:07,974 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:33:07,979 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 08:33:08,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:08,175 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:33:08,175 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:33:08,175 INFO L85 PathProgramCache]: Analyzing trace with hash -786070356, now seen corresponding path program 1 times [2023-12-02 08:33:08,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:33:08,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553101938] [2023-12-02 08:33:08,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:08,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:33:08,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:08,366 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:33:08,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:33:08,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553101938] [2023-12-02 08:33:08,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553101938] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:33:08,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396933077] [2023-12-02 08:33:08,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:33:08,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:33:08,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:33:08,368 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:33:08,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 08:33:08,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:33:08,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 864 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 08:33:08,522 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:33:08,716 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:33:08,716 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:33:10,525 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 08:33:10,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396933077] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:33:10,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355319899] [2023-12-02 08:33:10,529 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2023-12-02 08:33:10,529 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:33:10,530 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:33:10,530 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:33:10,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:33:20,667 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 08:33:20,669 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 155 for LOIs [2023-12-02 08:33:20,763 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 08:33:20,879 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 08:33:20,880 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 08:33:20,894 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 08:33:21,093 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 08:33:21,248 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:33:43,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6770814#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 08:33:43,160 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:33:43,160 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:33:43,160 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 6] total 18 [2023-12-02 08:33:43,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473590458] [2023-12-02 08:33:43,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:33:43,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 08:33:43,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:33:43,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 08:33:43,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=7802, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 08:33:43,163 INFO L87 Difference]: Start difference. First operand 138312 states and 169263 transitions. Second operand has 18 states, 15 states have (on average 12.666666666666666) internal successors, (190), 16 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:34:21,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:21,567 INFO L93 Difference]: Finished difference Result 393323 states and 498575 transitions. [2023-12-02 08:34:21,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2023-12-02 08:34:21,567 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 12.666666666666666) internal successors, (190), 16 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 154 [2023-12-02 08:34:21,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:22,221 INFO L225 Difference]: With dead ends: 393323 [2023-12-02 08:34:22,221 INFO L226 Difference]: Without dead ends: 300107 [2023-12-02 08:34:22,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 749 GetRequests, 475 SyntacticMatches, 2 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31531 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=4775, Invalid=70027, Unknown=0, NotChecked=0, Total=74802 [2023-12-02 08:34:22,326 INFO L413 NwaCegarLoop]: 3975 mSDtfsCounter, 20435 mSDsluCounter, 31590 mSDsCounter, 0 mSdLazyCounter, 6455 mSolverCounterSat, 698 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20447 SdHoareTripleChecker+Valid, 35565 SdHoareTripleChecker+Invalid, 7153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 698 IncrementalHoareTripleChecker+Valid, 6455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:22,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20447 Valid, 35565 Invalid, 7153 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [698 Valid, 6455 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2023-12-02 08:34:22,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300107 states. [2023-12-02 08:34:34,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300107 to 133976. [2023-12-02 08:34:34,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133976 states, 119641 states have (on average 1.2448324571008267) internal successors, (148933), 119896 states have internal predecessors, (148933), 7340 states have call successors, (7340), 7016 states have call predecessors, (7340), 6993 states have return successors, (7710), 7064 states have call predecessors, (7710), 7338 states have call successors, (7710) [2023-12-02 08:34:34,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133976 states to 133976 states and 163983 transitions. [2023-12-02 08:34:34,687 INFO L78 Accepts]: Start accepts. Automaton has 133976 states and 163983 transitions. Word has length 154 [2023-12-02 08:34:34,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:34,688 INFO L495 AbstractCegarLoop]: Abstraction has 133976 states and 163983 transitions. [2023-12-02 08:34:34,688 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 12.666666666666666) internal successors, (190), 16 states have internal predecessors, (190), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:34:34,688 INFO L276 IsEmpty]: Start isEmpty. Operand 133976 states and 163983 transitions. [2023-12-02 08:34:34,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 08:34:34,771 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:34,771 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:34,777 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 08:34:34,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:34,973 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:34:34,973 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:34,973 INFO L85 PathProgramCache]: Analyzing trace with hash -921422096, now seen corresponding path program 1 times [2023-12-02 08:34:34,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:34,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8225292] [2023-12-02 08:34:34,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:34,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:34,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:35,096 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 26 proven. 31 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-12-02 08:34:35,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:35,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8225292] [2023-12-02 08:34:35,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8225292] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:35,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126390526] [2023-12-02 08:34:35,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:35,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:35,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:35,097 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:35,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 08:34:35,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:35,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 08:34:35,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:34:35,255 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-12-02 08:34:35,255 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:34:35,255 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126390526] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:34:35,255 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:34:35,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-12-02 08:34:35,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867929099] [2023-12-02 08:34:35,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:34:35,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 08:34:35,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:34:35,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 08:34:35,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 08:34:35,257 INFO L87 Difference]: Start difference. First operand 133976 states and 163983 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:34:46,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:34:46,925 INFO L93 Difference]: Finished difference Result 254560 states and 311195 transitions. [2023-12-02 08:34:46,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 08:34:46,926 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 156 [2023-12-02 08:34:46,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:34:47,256 INFO L225 Difference]: With dead ends: 254560 [2023-12-02 08:34:47,256 INFO L226 Difference]: Without dead ends: 152909 [2023-12-02 08:34:47,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-12-02 08:34:47,350 INFO L413 NwaCegarLoop]: 3259 mSDtfsCounter, 3418 mSDsluCounter, 3393 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3418 SdHoareTripleChecker+Valid, 6652 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:34:47,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3418 Valid, 6652 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:34:47,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152909 states. [2023-12-02 08:34:59,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152909 to 147248. [2023-12-02 08:34:59,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147248 states, 131222 states have (on average 1.2419487585923092) internal successors, (162971), 131665 states have internal predecessors, (162971), 8029 states have call successors, (8029), 7636 states have call predecessors, (8029), 7995 states have return successors, (9595), 7947 states have call predecessors, (9595), 8027 states have call successors, (9595) [2023-12-02 08:34:59,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147248 states to 147248 states and 180595 transitions. [2023-12-02 08:34:59,460 INFO L78 Accepts]: Start accepts. Automaton has 147248 states and 180595 transitions. Word has length 156 [2023-12-02 08:34:59,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:34:59,460 INFO L495 AbstractCegarLoop]: Abstraction has 147248 states and 180595 transitions. [2023-12-02 08:34:59,460 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:34:59,460 INFO L276 IsEmpty]: Start isEmpty. Operand 147248 states and 180595 transitions. [2023-12-02 08:34:59,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 08:34:59,554 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:34:59,554 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:34:59,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 08:34:59,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:59,755 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:34:59,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:34:59,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1384534267, now seen corresponding path program 1 times [2023-12-02 08:34:59,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:34:59,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613554830] [2023-12-02 08:34:59,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:59,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:34:59,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:59,854 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 39 proven. 10 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 08:34:59,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:34:59,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613554830] [2023-12-02 08:34:59,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613554830] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:34:59,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328199043] [2023-12-02 08:34:59,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:34:59,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:34:59,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:34:59,856 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:34:59,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 08:34:59,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:34:59,999 INFO L262 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 08:35:00,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:00,147 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-12-02 08:35:00,147 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:35:00,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328199043] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:35:00,147 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:35:00,147 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 8 [2023-12-02 08:35:00,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317714589] [2023-12-02 08:35:00,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:35:00,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 08:35:00,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:00,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 08:35:00,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-12-02 08:35:00,149 INFO L87 Difference]: Start difference. First operand 147248 states and 180595 transitions. Second operand has 6 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:35:12,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:12,075 INFO L93 Difference]: Finished difference Result 270300 states and 333964 transitions. [2023-12-02 08:35:12,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 08:35:12,076 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 156 [2023-12-02 08:35:12,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:12,407 INFO L225 Difference]: With dead ends: 270300 [2023-12-02 08:35:12,407 INFO L226 Difference]: Without dead ends: 158360 [2023-12-02 08:35:12,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:35:12,514 INFO L413 NwaCegarLoop]: 3148 mSDtfsCounter, 3537 mSDsluCounter, 3125 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3548 SdHoareTripleChecker+Valid, 6273 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:12,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3548 Valid, 6273 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:35:12,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158360 states. [2023-12-02 08:35:24,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158360 to 142403. [2023-12-02 08:35:25,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142403 states, 126928 states have (on average 1.2282475103995967) internal successors, (155899), 127365 states have internal predecessors, (155899), 7614 states have call successors, (7614), 7394 states have call predecessors, (7614), 7859 states have return successors, (9159), 7644 states have call predecessors, (9159), 7612 states have call successors, (9159) [2023-12-02 08:35:25,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142403 states to 142403 states and 172672 transitions. [2023-12-02 08:35:25,314 INFO L78 Accepts]: Start accepts. Automaton has 142403 states and 172672 transitions. Word has length 156 [2023-12-02 08:35:25,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:25,315 INFO L495 AbstractCegarLoop]: Abstraction has 142403 states and 172672 transitions. [2023-12-02 08:35:25,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 2 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 08:35:25,315 INFO L276 IsEmpty]: Start isEmpty. Operand 142403 states and 172672 transitions. [2023-12-02 08:35:25,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 08:35:25,405 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:25,405 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:25,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-12-02 08:35:25,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:25,606 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:35:25,606 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:25,606 INFO L85 PathProgramCache]: Analyzing trace with hash 465995273, now seen corresponding path program 1 times [2023-12-02 08:35:25,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:25,606 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030553704] [2023-12-02 08:35:25,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:25,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:25,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:35:25,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:25,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030553704] [2023-12-02 08:35:25,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030553704] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:25,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430565893] [2023-12-02 08:35:25,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:25,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:25,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:25,874 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:25,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 08:35:26,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:26,041 INFO L262 TraceCheckSpWp]: Trace formula consists of 871 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 08:35:26,045 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:26,083 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 08:35:26,083 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:35:26,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430565893] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:35:26,083 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:35:26,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-12-02 08:35:26,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521751730] [2023-12-02 08:35:26,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:35:26,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:35:26,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:26,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:35:26,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:35:26,085 INFO L87 Difference]: Start difference. First operand 142403 states and 172672 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 08:35:38,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:35:38,236 INFO L93 Difference]: Finished difference Result 249880 states and 307016 transitions. [2023-12-02 08:35:38,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:35:38,237 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 156 [2023-12-02 08:35:38,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:35:38,532 INFO L225 Difference]: With dead ends: 249880 [2023-12-02 08:35:38,532 INFO L226 Difference]: Without dead ends: 141513 [2023-12-02 08:35:38,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-12-02 08:35:38,635 INFO L413 NwaCegarLoop]: 3288 mSDtfsCounter, 124 mSDsluCounter, 3188 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 6476 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:35:38,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 6476 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 08:35:38,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141513 states. [2023-12-02 08:35:51,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141513 to 139947. [2023-12-02 08:35:51,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139947 states, 124552 states have (on average 1.203754255250819) internal successors, (149930), 124989 states have internal predecessors, (149930), 7574 states have call successors, (7574), 7354 states have call predecessors, (7574), 7819 states have return successors, (9119), 7604 states have call predecessors, (9119), 7572 states have call successors, (9119) [2023-12-02 08:35:51,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139947 states to 139947 states and 166623 transitions. [2023-12-02 08:35:51,486 INFO L78 Accepts]: Start accepts. Automaton has 139947 states and 166623 transitions. Word has length 156 [2023-12-02 08:35:51,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:35:51,486 INFO L495 AbstractCegarLoop]: Abstraction has 139947 states and 166623 transitions. [2023-12-02 08:35:51,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 08:35:51,486 INFO L276 IsEmpty]: Start isEmpty. Operand 139947 states and 166623 transitions. [2023-12-02 08:35:51,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 08:35:51,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:35:51,573 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:35:51,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2023-12-02 08:35:51,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-12-02 08:35:51,774 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:35:51,774 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:35:51,774 INFO L85 PathProgramCache]: Analyzing trace with hash -745552110, now seen corresponding path program 1 times [2023-12-02 08:35:51,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:35:51,775 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835054377] [2023-12-02 08:35:51,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:51,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:35:51,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:51,857 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 28 proven. 4 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-12-02 08:35:51,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:35:51,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835054377] [2023-12-02 08:35:51,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835054377] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:35:51,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548290595] [2023-12-02 08:35:51,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:35:51,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:35:51,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:35:51,858 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:35:51,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 08:35:52,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:35:52,003 INFO L262 TraceCheckSpWp]: Trace formula consists of 768 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 08:35:52,006 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:35:52,034 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 08:35:52,034 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 08:35:52,034 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548290595] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 08:35:52,034 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 08:35:52,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 08:35:52,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204825100] [2023-12-02 08:35:52,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 08:35:52,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 08:35:52,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:35:52,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 08:35:52,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:35:52,036 INFO L87 Difference]: Start difference. First operand 139947 states and 166623 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:36:05,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:36:05,055 INFO L93 Difference]: Finished difference Result 250807 states and 299760 transitions. [2023-12-02 08:36:05,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 08:36:05,056 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 152 [2023-12-02 08:36:05,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:36:05,342 INFO L225 Difference]: With dead ends: 250807 [2023-12-02 08:36:05,342 INFO L226 Difference]: Without dead ends: 137655 [2023-12-02 08:36:05,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 08:36:05,438 INFO L413 NwaCegarLoop]: 3277 mSDtfsCounter, 76 mSDsluCounter, 3201 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 6478 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 08:36:05,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 6478 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 08:36:05,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137655 states. [2023-12-02 08:36:17,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137655 to 128430. [2023-12-02 08:36:17,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128430 states, 114165 states have (on average 1.211641045854684) internal successors, (138327), 114462 states have internal predecessors, (138327), 7074 states have call successors, (7074), 6860 states have call predecessors, (7074), 7189 states have return successors, (8416), 7108 states have call predecessors, (8416), 7072 states have call successors, (8416) [2023-12-02 08:36:17,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128430 states to 128430 states and 153817 transitions. [2023-12-02 08:36:17,548 INFO L78 Accepts]: Start accepts. Automaton has 128430 states and 153817 transitions. Word has length 152 [2023-12-02 08:36:17,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:36:17,548 INFO L495 AbstractCegarLoop]: Abstraction has 128430 states and 153817 transitions. [2023-12-02 08:36:17,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 08:36:17,548 INFO L276 IsEmpty]: Start isEmpty. Operand 128430 states and 153817 transitions. [2023-12-02 08:36:17,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 08:36:17,603 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:36:17,603 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:36:17,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 08:36:17,803 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-12-02 08:36:17,804 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:36:17,804 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:36:17,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1793750845, now seen corresponding path program 1 times [2023-12-02 08:36:17,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:36:17,805 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286873844] [2023-12-02 08:36:17,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:36:17,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:36:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:18,041 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 08:36:18,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:36:18,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286873844] [2023-12-02 08:36:18,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286873844] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:36:18,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128175952] [2023-12-02 08:36:18,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:36:18,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:36:18,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:36:18,043 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:36:18,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 08:36:18,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:36:18,196 INFO L262 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 08:36:18,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:36:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 08:36:18,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:36:20,081 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-12-02 08:36:20,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128175952] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:36:20,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2094816230] [2023-12-02 08:36:20,085 INFO L159 IcfgInterpreter]: Started Sifa with 94 locations of interest [2023-12-02 08:36:20,085 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:36:20,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:36:20,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:36:20,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:36:31,945 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 08:36:31,946 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 08:36:31,953 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 08:36:32,070 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 08:36:32,071 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 08:36:32,086 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 08:36:32,157 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 08:36:32,257 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 08:36:58,802 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9236647#(and (= ~m_pc~0 1) (= ~m_st~0 1) (not (= ~token~0 (+ 5 ~local~0))))' at error location [2023-12-02 08:36:58,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 08:36:58,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 08:36:58,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 6] total 19 [2023-12-02 08:36:58,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731707222] [2023-12-02 08:36:58,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 08:36:58,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 08:36:58,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 08:36:58,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 08:36:58,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=679, Invalid=8827, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 08:36:58,805 INFO L87 Difference]: Start difference. First operand 128430 states and 153817 transitions. Second operand has 19 states, 16 states have (on average 12.125) internal successors, (194), 17 states have internal predecessors, (194), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:37:32,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 08:37:32,232 INFO L93 Difference]: Finished difference Result 258779 states and 317627 transitions. [2023-12-02 08:37:32,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 259 states. [2023-12-02 08:37:32,232 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 12.125) internal successors, (194), 17 states have internal predecessors, (194), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) Word has length 157 [2023-12-02 08:37:32,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 08:37:32,675 INFO L225 Difference]: With dead ends: 258779 [2023-12-02 08:37:32,676 INFO L226 Difference]: Without dead ends: 187735 [2023-12-02 08:37:32,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 852 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 340 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50386 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=8186, Invalid=108436, Unknown=0, NotChecked=0, Total=116622 [2023-12-02 08:37:32,757 INFO L413 NwaCegarLoop]: 4127 mSDtfsCounter, 13467 mSDsluCounter, 36992 mSDsCounter, 0 mSdLazyCounter, 8142 mSolverCounterSat, 498 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13478 SdHoareTripleChecker+Valid, 41119 SdHoareTripleChecker+Invalid, 8640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 498 IncrementalHoareTripleChecker+Valid, 8142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2023-12-02 08:37:32,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13478 Valid, 41119 Invalid, 8640 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [498 Valid, 8142 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2023-12-02 08:37:32,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187735 states. [2023-12-02 08:37:44,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187735 to 109465. [2023-12-02 08:37:44,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109465 states, 97476 states have (on average 1.2131088678238746) internal successors, (118249), 97741 states have internal predecessors, (118249), 5882 states have call successors, (5882), 5760 states have call predecessors, (5882), 6105 states have return successors, (7084), 5964 states have call predecessors, (7084), 5880 states have call successors, (7084) [2023-12-02 08:37:44,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109465 states to 109465 states and 131215 transitions. [2023-12-02 08:37:44,397 INFO L78 Accepts]: Start accepts. Automaton has 109465 states and 131215 transitions. Word has length 157 [2023-12-02 08:37:44,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 08:37:44,397 INFO L495 AbstractCegarLoop]: Abstraction has 109465 states and 131215 transitions. [2023-12-02 08:37:44,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 12.125) internal successors, (194), 17 states have internal predecessors, (194), 7 states have call successors, (31), 4 states have call predecessors, (31), 7 states have return successors, (30), 6 states have call predecessors, (30), 7 states have call successors, (30) [2023-12-02 08:37:44,398 INFO L276 IsEmpty]: Start isEmpty. Operand 109465 states and 131215 transitions. [2023-12-02 08:37:44,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 08:37:44,446 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 08:37:44,446 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 08:37:44,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2023-12-02 08:37:44,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2023-12-02 08:37:44,647 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 08:37:44,648 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 08:37:44,648 INFO L85 PathProgramCache]: Analyzing trace with hash 655604280, now seen corresponding path program 1 times [2023-12-02 08:37:44,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 08:37:44,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428018655] [2023-12-02 08:37:44,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:44,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 08:37:44,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:44,753 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 36 proven. 7 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 08:37:44,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 08:37:44,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428018655] [2023-12-02 08:37:44,754 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428018655] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 08:37:44,754 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617670722] [2023-12-02 08:37:44,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 08:37:44,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 08:37:44,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 08:37:44,755 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 08:37:44,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_920fd22e-b844-4c9a-85ff-59d28fc6e2ab/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 08:37:44,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 08:37:44,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 774 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 08:37:44,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 08:37:45,217 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 73 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 08:37:45,217 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 08:37:45,349 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 36 proven. 7 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 08:37:45,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617670722] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 08:37:45,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1637047133] [2023-12-02 08:37:45,351 INFO L159 IcfgInterpreter]: Started Sifa with 78 locations of interest [2023-12-02 08:37:45,351 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 08:37:45,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 08:37:45,351 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 08:37:45,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 08:37:58,704 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 33 for LOIs [2023-12-02 08:37:58,707 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 172 for LOIs [2023-12-02 08:37:58,863 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2023-12-02 08:37:58,969 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 8192 conjunctions. This might take some time... [2023-12-02 08:38:14,766 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 8192 conjunctions. [2023-12-02 08:38:15,092 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 13 [2023-12-02 08:38:15,190 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 8192 conjunctions. This might take some time... [2023-12-02 08:38:32,284 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 8192 conjunctions.