./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+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_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/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_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/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_bc2c7676-9f60-4703-9505-f848afe2b668/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 22315e954f625a92454f179210263631b555d33fa4f07d11e85c64617a347172 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:16:40,239 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:16:40,303 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:16:40,308 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:16:40,308 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:16:40,332 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:16:40,332 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:16:40,333 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:16:40,333 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:16:40,334 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:16:40,334 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:16:40,335 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:16:40,335 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:16:40,336 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:16:40,337 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:16:40,337 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:16:40,338 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:16:40,338 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:16:40,339 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:16:40,339 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:16:40,340 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:16:40,341 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:16:40,341 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:16:40,342 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:16:40,342 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:16:40,343 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:16:40,343 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:16:40,344 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:16:40,344 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:16:40,344 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:16:40,345 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:16:40,345 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:16:40,345 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:16:40,346 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:16:40,346 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:16:40,346 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:16:40,346 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:16:40,347 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:16:40,347 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:16:40,347 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:16:40,347 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:16:40,348 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:16:40,349 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_bc2c7676-9f60-4703-9505-f848afe2b668/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 22315e954f625a92454f179210263631b555d33fa4f07d11e85c64617a347172 [2023-12-02 15:16:40,558 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:16:40,579 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:16:40,582 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:16:40,583 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:16:40,583 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:16:40,585 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c [2023-12-02 15:16:43,397 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:16:43,971 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:16:43,971 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c [2023-12-02 15:16:44,022 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/data/e5a9d471b/52d4d4d73c90428cb4b27b8a68bc8c06/FLAG76f0cf4c3 [2023-12-02 15:16:44,038 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/data/e5a9d471b/52d4d4d73c90428cb4b27b8a68bc8c06 [2023-12-02 15:16:44,041 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:16:44,042 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:16:44,044 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:16:44,044 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:16:44,078 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:16:44,078 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:16:44" (1/1) ... [2023-12-02 15:16:44,079 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60f93b54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:44, skipping insertion in model container [2023-12-02 15:16:44,080 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:16:44" (1/1) ... [2023-12-02 15:16:44,291 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:16:46,159 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_bc2c7676-9f60-4703-9505-f848afe2b668/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[380593,380606] [2023-12-02 15:16:46,186 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_bc2c7676-9f60-4703-9505-f848afe2b668/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[383339,383352] [2023-12-02 15:16:46,395 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:16:46,404 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:16:47,456 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_bc2c7676-9f60-4703-9505-f848afe2b668/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[380593,380606] [2023-12-02 15:16:47,461 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_bc2c7676-9f60-4703-9505-f848afe2b668/sv-benchmarks/c/combinations/Problem05_label49+token_ring.05.cil-2.c[383339,383352] [2023-12-02 15:16:47,475 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:16:47,552 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:16:47,553 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47 WrapperNode [2023-12-02 15:16:47,553 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:16:47,554 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:16:47,554 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:16:47,554 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:16:47,561 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:47,627 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,057 INFO L138 Inliner]: procedures = 54, calls = 57, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 12814 [2023-12-02 15:16:48,058 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:16:48,058 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:16:48,059 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:16:48,059 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:16:48,068 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,068 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,228 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,229 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,370 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,407 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,431 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,451 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,567 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:16:48,570 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:16:48,570 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:16:48,571 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:16:48,571 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (1/1) ... [2023-12-02 15:16:48,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:16:48,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:16:48,606 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:16:48,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:16:48,652 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:16:48,654 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 15:16:48,655 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 15:16:48,655 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 15:16:48,655 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 15:16:48,655 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 15:16:48,657 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 15:16:48,657 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 15:16:48,657 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 15:16:48,658 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 15:16:48,658 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 15:16:48,658 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 15:16:48,658 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 15:16:48,659 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 15:16:48,659 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 15:16:48,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:16:48,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:16:48,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:16:48,797 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:16:48,800 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:16:56,700 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:16:58,456 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:16:58,456 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 15:16:58,458 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:16:58 BoogieIcfgContainer [2023-12-02 15:16:58,458 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:16:58,461 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:16:58,461 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:16:58,463 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:16:58,464 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:16:44" (1/3) ... [2023-12-02 15:16:58,464 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44f679c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:16:58, skipping insertion in model container [2023-12-02 15:16:58,464 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:16:47" (2/3) ... [2023-12-02 15:16:58,465 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44f679c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:16:58, skipping insertion in model container [2023-12-02 15:16:58,465 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:16:58" (3/3) ... [2023-12-02 15:16:58,466 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.05.cil-2.c [2023-12-02 15:16:58,482 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:16:58,482 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-12-02 15:16:58,562 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:16:58,568 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;@718f0311, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:16:58,568 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-12-02 15:16:58,579 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 15:16:58,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 15:16:58,589 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:16:58,589 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 15:16:58,590 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:16:58,595 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:16:58,595 INFO L85 PathProgramCache]: Analyzing trace with hash -317380772, now seen corresponding path program 1 times [2023-12-02 15:16:58,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:16:58,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717695765] [2023-12-02 15:16:58,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:16:58,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:16:58,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:16:58,959 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 15:16:58,961 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:16:58,961 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717695765] [2023-12-02 15:16:58,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717695765] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:16:58,962 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:16:58,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 15:16:58,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922336827] [2023-12-02 15:16:58,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:16:58,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:16:58,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:16:59,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:16:59,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:16:59,009 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 15:16:59,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:16:59,916 INFO L93 Difference]: Finished difference Result 3631 states and 7073 transitions. [2023-12-02 15:16:59,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:16:59,919 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 15:16:59,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:16:59,943 INFO L225 Difference]: With dead ends: 3631 [2023-12-02 15:16:59,943 INFO L226 Difference]: Without dead ends: 1864 [2023-12-02 15:16:59,951 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 15:16:59,955 INFO L413 NwaCegarLoop]: 3320 mSDtfsCounter, 3568 mSDsluCounter, 3248 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3568 SdHoareTripleChecker+Valid, 6568 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:16:59,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3568 Valid, 6568 Invalid, 632 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 15:16:59,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1864 states. [2023-12-02 15:17:00,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1864 to 1863. [2023-12-02 15:17:00,067 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 15:17:00,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3584 transitions. [2023-12-02 15:17:00,080 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3584 transitions. Word has length 47 [2023-12-02 15:17:00,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:00,081 INFO L495 AbstractCegarLoop]: Abstraction has 1863 states and 3584 transitions. [2023-12-02 15:17:00,081 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 15:17:00,081 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3584 transitions. [2023-12-02 15:17:00,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 15:17:00,088 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:00,088 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 15:17:00,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:17:00,089 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:00,089 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:00,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1818823773, now seen corresponding path program 1 times [2023-12-02 15:17:00,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:00,090 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321415523] [2023-12-02 15:17:00,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:00,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:00,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:00,330 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 15:17:00,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:00,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321415523] [2023-12-02 15:17:00,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321415523] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:00,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160101235] [2023-12-02 15:17:00,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:00,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:00,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:00,340 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:00,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:17:00,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:00,504 INFO L262 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:00,511 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:00,570 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 15:17:00,570 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:00,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160101235] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:00,570 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:00,571 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:17:00,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721300208] [2023-12-02 15:17:00,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:00,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:00,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:00,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:00,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:00,574 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 15:17:01,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:01,040 INFO L93 Difference]: Finished difference Result 2290 states and 4205 transitions. [2023-12-02 15:17:01,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:01,040 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 15:17:01,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:01,053 INFO L225 Difference]: With dead ends: 2290 [2023-12-02 15:17:01,054 INFO L226 Difference]: Without dead ends: 2073 [2023-12-02 15:17:01,055 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 15:17:01,057 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 15:17:01,057 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 15:17:01,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2073 states. [2023-12-02 15:17:01,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2073 to 2067. [2023-12-02 15:17:01,106 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 15:17:01,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2067 states to 2067 states and 3871 transitions. [2023-12-02 15:17:01,116 INFO L78 Accepts]: Start accepts. Automaton has 2067 states and 3871 transitions. Word has length 89 [2023-12-02 15:17:01,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:01,117 INFO L495 AbstractCegarLoop]: Abstraction has 2067 states and 3871 transitions. [2023-12-02 15:17:01,117 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 15:17:01,117 INFO L276 IsEmpty]: Start isEmpty. Operand 2067 states and 3871 transitions. [2023-12-02 15:17:01,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 15:17:01,121 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:01,121 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 15:17:01,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:17:01,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:01,325 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:01,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:01,326 INFO L85 PathProgramCache]: Analyzing trace with hash 2037214629, now seen corresponding path program 1 times [2023-12-02 15:17:01,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:01,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085426428] [2023-12-02 15:17:01,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:01,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:01,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:01,474 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 15:17:01,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:01,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085426428] [2023-12-02 15:17:01,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085426428] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:01,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988064907] [2023-12-02 15:17:01,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:01,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:01,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:01,479 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:01,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:17:01,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:01,630 INFO L262 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:01,634 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:01,681 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 15:17:01,682 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:01,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988064907] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:01,682 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:01,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:17:01,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894138855] [2023-12-02 15:17:01,683 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:01,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:01,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:01,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:01,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:01,685 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 15:17:02,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:02,140 INFO L93 Difference]: Finished difference Result 2896 states and 5070 transitions. [2023-12-02 15:17:02,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:02,141 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 15:17:02,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:02,154 INFO L225 Difference]: With dead ends: 2896 [2023-12-02 15:17:02,155 INFO L226 Difference]: Without dead ends: 2475 [2023-12-02 15:17:02,157 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 15:17:02,158 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 15:17:02,158 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 15:17:02,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2023-12-02 15:17:02,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2467. [2023-12-02 15:17:02,222 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 15:17:02,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2467 states to 2467 states and 4429 transitions. [2023-12-02 15:17:02,234 INFO L78 Accepts]: Start accepts. Automaton has 2467 states and 4429 transitions. Word has length 89 [2023-12-02 15:17:02,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:02,234 INFO L495 AbstractCegarLoop]: Abstraction has 2467 states and 4429 transitions. [2023-12-02 15:17:02,234 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 15:17:02,234 INFO L276 IsEmpty]: Start isEmpty. Operand 2467 states and 4429 transitions. [2023-12-02 15:17:02,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 15:17:02,238 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:02,238 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 15:17:02,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:17:02,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:02,439 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:02,439 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:02,439 INFO L85 PathProgramCache]: Analyzing trace with hash 941625639, now seen corresponding path program 1 times [2023-12-02 15:17:02,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:02,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585304200] [2023-12-02 15:17:02,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:02,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:02,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:02,561 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 15:17:02,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:02,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585304200] [2023-12-02 15:17:02,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585304200] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:02,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288611131] [2023-12-02 15:17:02,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:02,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:02,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:02,565 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:02,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:17:02,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:02,718 INFO L262 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:02,722 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:02,751 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 15:17:02,751 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:02,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288611131] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:02,751 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:02,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-12-02 15:17:02,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416578517] [2023-12-02 15:17:02,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:02,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:02,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:02,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:02,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:02,753 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 15:17:03,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:03,318 INFO L93 Difference]: Finished difference Result 4084 states and 6750 transitions. [2023-12-02 15:17:03,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:03,319 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 15:17:03,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:03,340 INFO L225 Difference]: With dead ends: 4084 [2023-12-02 15:17:03,341 INFO L226 Difference]: Without dead ends: 3263 [2023-12-02 15:17:03,344 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 15:17:03,345 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 15:17:03,346 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 15:17:03,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3263 states. [2023-12-02 15:17:03,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3263 to 3251. [2023-12-02 15:17:03,466 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 15:17:03,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3251 states to 3251 states and 5513 transitions. [2023-12-02 15:17:03,483 INFO L78 Accepts]: Start accepts. Automaton has 3251 states and 5513 transitions. Word has length 89 [2023-12-02 15:17:03,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:03,483 INFO L495 AbstractCegarLoop]: Abstraction has 3251 states and 5513 transitions. [2023-12-02 15:17:03,484 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 15:17:03,484 INFO L276 IsEmpty]: Start isEmpty. Operand 3251 states and 5513 transitions. [2023-12-02 15:17:03,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-12-02 15:17:03,488 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:03,489 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 15:17:03,495 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 15:17:03,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:03,689 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:03,690 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:03,690 INFO L85 PathProgramCache]: Analyzing trace with hash -1308606491, now seen corresponding path program 1 times [2023-12-02 15:17:03,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:03,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56985234] [2023-12-02 15:17:03,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:03,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:03,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:03,761 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 15:17:03,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:03,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56985234] [2023-12-02 15:17:03,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56985234] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:03,762 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:17:03,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:17:03,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910126227] [2023-12-02 15:17:03,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:03,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:03,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:03,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:03,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:17:03,764 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 15:17:04,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:04,327 INFO L93 Difference]: Finished difference Result 4527 states and 7340 transitions. [2023-12-02 15:17:04,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:04,328 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 15:17:04,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:04,355 INFO L225 Difference]: With dead ends: 4527 [2023-12-02 15:17:04,355 INFO L226 Difference]: Without dead ends: 3691 [2023-12-02 15:17:04,359 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 15:17:04,361 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 15:17:04,361 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 15:17:04,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3691 states. [2023-12-02 15:17:04,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3691 to 3543. [2023-12-02 15:17:04,502 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 15:17:04,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3543 states to 3543 states and 5961 transitions. [2023-12-02 15:17:04,515 INFO L78 Accepts]: Start accepts. Automaton has 3543 states and 5961 transitions. Word has length 89 [2023-12-02 15:17:04,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:04,516 INFO L495 AbstractCegarLoop]: Abstraction has 3543 states and 5961 transitions. [2023-12-02 15:17:04,516 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 15:17:04,516 INFO L276 IsEmpty]: Start isEmpty. Operand 3543 states and 5961 transitions. [2023-12-02 15:17:04,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 15:17:04,523 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:04,524 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 15:17:04,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 15:17:04,524 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:04,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:04,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1809433943, now seen corresponding path program 1 times [2023-12-02 15:17:04,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:04,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590363370] [2023-12-02 15:17:04,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:04,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:04,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:04,607 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 15:17:04,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:04,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590363370] [2023-12-02 15:17:04,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590363370] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:04,608 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:17:04,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:17:04,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483642536] [2023-12-02 15:17:04,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:04,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:04,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:04,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:04,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:17:04,610 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 15:17:05,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:05,148 INFO L93 Difference]: Finished difference Result 7264 states and 11306 transitions. [2023-12-02 15:17:05,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:05,148 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 15:17:05,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:05,183 INFO L225 Difference]: With dead ends: 7264 [2023-12-02 15:17:05,183 INFO L226 Difference]: Without dead ends: 5367 [2023-12-02 15:17:05,191 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 15:17:05,192 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, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:17:05,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3406 Valid, 3332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:17:05,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5367 states. [2023-12-02 15:17:05,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5367 to 5339. [2023-12-02 15:17:05,405 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 15:17:05,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5339 states to 5339 states and 8449 transitions. [2023-12-02 15:17:05,421 INFO L78 Accepts]: Start accepts. Automaton has 5339 states and 8449 transitions. Word has length 119 [2023-12-02 15:17:05,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:05,421 INFO L495 AbstractCegarLoop]: Abstraction has 5339 states and 8449 transitions. [2023-12-02 15:17:05,421 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 15:17:05,422 INFO L276 IsEmpty]: Start isEmpty. Operand 5339 states and 8449 transitions. [2023-12-02 15:17:05,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-12-02 15:17:05,433 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:05,434 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 15:17:05,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 15:17:05,434 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:05,434 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:05,434 INFO L85 PathProgramCache]: Analyzing trace with hash 805816638, now seen corresponding path program 1 times [2023-12-02 15:17:05,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:05,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015402338] [2023-12-02 15:17:05,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:05,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:05,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:05,518 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 15:17:05,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:05,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015402338] [2023-12-02 15:17:05,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015402338] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:05,518 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:17:05,519 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 15:17:05,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177927349] [2023-12-02 15:17:05,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:05,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:05,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:05,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:05,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 15:17:05,520 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 15:17:06,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:06,326 INFO L93 Difference]: Finished difference Result 12580 states and 18730 transitions. [2023-12-02 15:17:06,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:06,327 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 15:17:06,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:06,386 INFO L225 Difference]: With dead ends: 12580 [2023-12-02 15:17:06,386 INFO L226 Difference]: Without dead ends: 8887 [2023-12-02 15:17:06,403 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 15:17:06,404 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 15:17:06,404 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 15:17:06,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8887 states. [2023-12-02 15:17:06,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8887 to 8835. [2023-12-02 15:17:06,857 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 15:17:06,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8835 states to 8835 states and 13233 transitions. [2023-12-02 15:17:06,892 INFO L78 Accepts]: Start accepts. Automaton has 8835 states and 13233 transitions. Word has length 119 [2023-12-02 15:17:06,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:06,892 INFO L495 AbstractCegarLoop]: Abstraction has 8835 states and 13233 transitions. [2023-12-02 15:17:06,893 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 15:17:06,893 INFO L276 IsEmpty]: Start isEmpty. Operand 8835 states and 13233 transitions. [2023-12-02 15:17:06,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 15:17:06,926 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:06,927 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 15:17:06,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 15:17:06,927 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:06,927 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:06,928 INFO L85 PathProgramCache]: Analyzing trace with hash -895073137, now seen corresponding path program 1 times [2023-12-02 15:17:06,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:06,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431457928] [2023-12-02 15:17:06,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:06,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:06,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:07,100 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 15:17:07,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:07,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431457928] [2023-12-02 15:17:07,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431457928] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:07,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418239025] [2023-12-02 15:17:07,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:07,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:07,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:07,104 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:07,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:17:07,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:07,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:07,302 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:07,334 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 15:17:07,335 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:07,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418239025] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:07,335 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:07,335 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:17:07,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275717181] [2023-12-02 15:17:07,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:07,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:07,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:07,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:07,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:07,338 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 15:17:08,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:08,114 INFO L93 Difference]: Finished difference Result 14891 states and 21879 transitions. [2023-12-02 15:17:08,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:08,115 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 15:17:08,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:08,157 INFO L225 Difference]: With dead ends: 14891 [2023-12-02 15:17:08,157 INFO L226 Difference]: Without dead ends: 11199 [2023-12-02 15:17:08,172 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 15:17:08,173 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 15:17:08,173 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 15:17:08,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11199 states. [2023-12-02 15:17:08,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11199 to 10363. [2023-12-02 15:17:08,586 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 15:17:08,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10363 states to 10363 states and 15521 transitions. [2023-12-02 15:17:08,614 INFO L78 Accepts]: Start accepts. Automaton has 10363 states and 15521 transitions. Word has length 135 [2023-12-02 15:17:08,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:08,614 INFO L495 AbstractCegarLoop]: Abstraction has 10363 states and 15521 transitions. [2023-12-02 15:17:08,614 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 15:17:08,615 INFO L276 IsEmpty]: Start isEmpty. Operand 10363 states and 15521 transitions. [2023-12-02 15:17:08,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 15:17:08,648 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:08,648 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 15:17:08,655 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:17:08,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:08,853 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:08,853 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:08,853 INFO L85 PathProgramCache]: Analyzing trace with hash 2055099916, now seen corresponding path program 1 times [2023-12-02 15:17:08,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:08,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329898855] [2023-12-02 15:17:08,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:08,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:08,990 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 15:17:08,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:08,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329898855] [2023-12-02 15:17:08,991 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329898855] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:08,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709419058] [2023-12-02 15:17:08,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:08,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:08,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:08,992 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:08,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:17:09,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:09,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:09,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:09,199 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 15:17:09,199 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:09,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709419058] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:09,200 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:09,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:17:09,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027019797] [2023-12-02 15:17:09,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:09,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:09,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:09,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:09,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:09,202 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 15:17:09,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:09,858 INFO L93 Difference]: Finished difference Result 18051 states and 26527 transitions. [2023-12-02 15:17:09,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:09,858 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 15:17:09,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:09,898 INFO L225 Difference]: With dead ends: 18051 [2023-12-02 15:17:09,898 INFO L226 Difference]: Without dead ends: 13607 [2023-12-02 15:17:09,912 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 15:17:09,913 INFO L413 NwaCegarLoop]: 3296 mSDtfsCounter, 96 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 15:17:09,913 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 15:17:09,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13607 states. [2023-12-02 15:17:10,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13607 to 12547. [2023-12-02 15:17:10,329 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 15:17:10,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12547 states to 12547 states and 18737 transitions. [2023-12-02 15:17:10,357 INFO L78 Accepts]: Start accepts. Automaton has 12547 states and 18737 transitions. Word has length 135 [2023-12-02 15:17:10,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:10,358 INFO L495 AbstractCegarLoop]: Abstraction has 12547 states and 18737 transitions. [2023-12-02 15:17:10,358 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 15:17:10,358 INFO L276 IsEmpty]: Start isEmpty. Operand 12547 states and 18737 transitions. [2023-12-02 15:17:10,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 15:17:10,390 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:10,390 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 15:17:10,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 15:17:10,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:10,591 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:10,591 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:10,592 INFO L85 PathProgramCache]: Analyzing trace with hash -66112587, now seen corresponding path program 1 times [2023-12-02 15:17:10,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:10,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013338911] [2023-12-02 15:17:10,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:10,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:10,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:10,711 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 15:17:10,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:10,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013338911] [2023-12-02 15:17:10,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013338911] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:10,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803940510] [2023-12-02 15:17:10,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:10,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:10,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:10,713 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:10,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 15:17:10,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:10,888 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:17:10,892 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:10,918 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 15:17:10,918 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:17:10,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803940510] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:17:10,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:17:10,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:17:10,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439459747] [2023-12-02 15:17:10,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:17:10,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:17:10,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:17:10,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:17:10,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:17:10,921 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 15:17:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:17:11,747 INFO L93 Difference]: Finished difference Result 22531 states and 33139 transitions. [2023-12-02 15:17:11,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:17:11,748 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 15:17:11,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:17:11,803 INFO L225 Difference]: With dead ends: 22531 [2023-12-02 15:17:11,803 INFO L226 Difference]: Without dead ends: 16923 [2023-12-02 15:17:11,820 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 15:17:11,821 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 15:17:11,821 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 15:17:11,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16923 states. [2023-12-02 15:17:12,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16923 to 15751. [2023-12-02 15:17:12,402 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 15:17:12,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15751 states to 15751 states and 23417 transitions. [2023-12-02 15:17:12,440 INFO L78 Accepts]: Start accepts. Automaton has 15751 states and 23417 transitions. Word has length 135 [2023-12-02 15:17:12,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:17:12,440 INFO L495 AbstractCegarLoop]: Abstraction has 15751 states and 23417 transitions. [2023-12-02 15:17:12,440 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 15:17:12,440 INFO L276 IsEmpty]: Start isEmpty. Operand 15751 states and 23417 transitions. [2023-12-02 15:17:12,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 15:17:12,476 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:17:12,476 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 15:17:12,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 15:17:12,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 15:17:12,677 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:17:12,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:17:12,677 INFO L85 PathProgramCache]: Analyzing trace with hash -1996856850, now seen corresponding path program 1 times [2023-12-02 15:17:12,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:17:12,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265808785] [2023-12-02 15:17:12,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:12,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:17:12,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:13,197 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 15:17:13,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:17:13,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265808785] [2023-12-02 15:17:13,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265808785] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:17:13,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361773397] [2023-12-02 15:17:13,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:17:13,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:17:13,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:17:13,199 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:17:13,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 15:17:13,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:17:13,399 INFO L262 TraceCheckSpWp]: Trace formula consists of 815 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:17:13,404 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:17:13,634 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 15:17:13,634 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:17:14,008 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 15:17:14,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361773397] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:17:14,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240486988] [2023-12-02 15:17:14,032 INFO L159 IcfgInterpreter]: Started Sifa with 75 locations of interest [2023-12-02 15:17:14,032 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:17:14,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:17:14,042 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:17:14,042 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:17:57,062 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 15:17:57,064 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 169 for LOIs [2023-12-02 15:17:57,207 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 181 for LOIs [2023-12-02 15:17:57,405 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 144 for LOIs [2023-12-02 15:17:57,501 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 147 for LOIs [2023-12-02 15:17:57,599 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 34 for LOIs [2023-12-02 15:17:57,665 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 16 for LOIs [2023-12-02 15:17:57,888 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:18:06,660 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 15:18:06,661 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:18:06,661 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:18:06,661 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6] total 9 [2023-12-02 15:18:06,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055990977] [2023-12-02 15:18:06,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:18:06,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 15:18:06,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:06,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 15:18:06,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=4060, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 15:18:06,664 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 15:18:08,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:08,022 INFO L93 Difference]: Finished difference Result 35467 states and 51535 transitions. [2023-12-02 15:18:08,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 15:18:08,023 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 15:18:08,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:08,063 INFO L225 Difference]: With dead ends: 35467 [2023-12-02 15:18:08,063 INFO L226 Difference]: Without dead ends: 21363 [2023-12-02 15:18:08,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 358 SyntacticMatches, 9 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2244 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=423, Invalid=4833, Unknown=0, NotChecked=0, Total=5256 [2023-12-02 15:18:08,092 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 15:18:08,092 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 15:18:08,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21363 states. [2023-12-02 15:18:08,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21363 to 20751. [2023-12-02 15:18:08,632 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 15:18:08,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20751 states to 20751 states and 30281 transitions. [2023-12-02 15:18:08,671 INFO L78 Accepts]: Start accepts. Automaton has 20751 states and 30281 transitions. Word has length 139 [2023-12-02 15:18:08,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:08,672 INFO L495 AbstractCegarLoop]: Abstraction has 20751 states and 30281 transitions. [2023-12-02 15:18:08,672 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 15:18:08,672 INFO L276 IsEmpty]: Start isEmpty. Operand 20751 states and 30281 transitions. [2023-12-02 15:18:08,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 15:18:08,697 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:08,698 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 15:18:08,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 15:18:08,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:08,898 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:08,899 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:08,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1703816399, now seen corresponding path program 2 times [2023-12-02 15:18:08,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:08,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802570813] [2023-12-02 15:18:08,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:08,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:08,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:09,173 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 15:18:09,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:09,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802570813] [2023-12-02 15:18:09,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802570813] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:09,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900961130] [2023-12-02 15:18:09,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:18:09,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:09,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:09,175 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:09,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 15:18:09,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 15:18:09,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:18:09,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:18:09,350 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:09,370 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 15:18:09,370 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:09,371 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900961130] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:09,371 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:09,371 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:18:09,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64471875] [2023-12-02 15:18:09,371 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:09,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:18:09,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:09,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:18:09,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:18:09,373 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 15:18:10,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:10,376 INFO L93 Difference]: Finished difference Result 34599 states and 50427 transitions. [2023-12-02 15:18:10,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:18:10,377 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 15:18:10,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:10,432 INFO L225 Difference]: With dead ends: 34599 [2023-12-02 15:18:10,432 INFO L226 Difference]: Without dead ends: 20787 [2023-12-02 15:18:10,460 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 15:18:10,461 INFO L413 NwaCegarLoop]: 3277 mSDtfsCounter, 152 mSDsluCounter, 3190 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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 15:18:10,461 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 15:18:10,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20787 states. [2023-12-02 15:18:11,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20787 to 20599. [2023-12-02 15:18:11,068 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 15:18:11,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20599 states to 20599 states and 29849 transitions. [2023-12-02 15:18:11,103 INFO L78 Accepts]: Start accepts. Automaton has 20599 states and 29849 transitions. Word has length 135 [2023-12-02 15:18:11,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:11,103 INFO L495 AbstractCegarLoop]: Abstraction has 20599 states and 29849 transitions. [2023-12-02 15:18:11,103 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 15:18:11,103 INFO L276 IsEmpty]: Start isEmpty. Operand 20599 states and 29849 transitions. [2023-12-02 15:18:11,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-12-02 15:18:11,123 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:11,124 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 15:18:11,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 15:18:11,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 15:18:11,325 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:11,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:11,325 INFO L85 PathProgramCache]: Analyzing trace with hash 42866863, now seen corresponding path program 1 times [2023-12-02 15:18:11,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:11,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071078610] [2023-12-02 15:18:11,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:11,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:11,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:11,586 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 15:18:11,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:11,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071078610] [2023-12-02 15:18:11,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071078610] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:11,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268341331] [2023-12-02 15:18:11,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:11,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:11,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:11,587 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:11,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 15:18:11,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:11,766 INFO L262 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:18:11,770 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:11,795 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 15:18:11,796 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:11,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268341331] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:11,796 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:11,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:18:11,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299428122] [2023-12-02 15:18:11,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:11,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:18:11,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:11,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:18:11,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:18:11,798 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 15:18:12,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:12,631 INFO L93 Difference]: Finished difference Result 35623 states and 50782 transitions. [2023-12-02 15:18:12,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:18:12,632 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 15:18:12,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:12,675 INFO L225 Difference]: With dead ends: 35623 [2023-12-02 15:18:12,675 INFO L226 Difference]: Without dead ends: 23099 [2023-12-02 15:18:12,765 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 15:18:12,766 INFO L413 NwaCegarLoop]: 3216 mSDtfsCounter, 3418 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 15:18:12,766 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 15:18:12,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23099 states. [2023-12-02 15:18:13,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23099 to 23099. [2023-12-02 15:18:13,468 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 15:18:13,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23099 states to 23099 states and 32685 transitions. [2023-12-02 15:18:13,506 INFO L78 Accepts]: Start accepts. Automaton has 23099 states and 32685 transitions. Word has length 135 [2023-12-02 15:18:13,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:13,506 INFO L495 AbstractCegarLoop]: Abstraction has 23099 states and 32685 transitions. [2023-12-02 15:18:13,506 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 15:18:13,506 INFO L276 IsEmpty]: Start isEmpty. Operand 23099 states and 32685 transitions. [2023-12-02 15:18:13,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 15:18:13,527 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:13,527 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 15:18:13,532 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 15:18:13,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 15:18:13,728 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:13,728 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:13,729 INFO L85 PathProgramCache]: Analyzing trace with hash -2048240628, now seen corresponding path program 1 times [2023-12-02 15:18:13,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:13,729 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742868943] [2023-12-02 15:18:13,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:13,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:13,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:13,909 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 15:18:13,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:13,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742868943] [2023-12-02 15:18:13,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742868943] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:13,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322902345] [2023-12-02 15:18:13,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:13,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:13,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:13,911 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:13,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 15:18:14,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:14,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:18:14,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:14,108 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 15:18:14,109 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:14,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322902345] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:14,109 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:14,109 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:18:14,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694849010] [2023-12-02 15:18:14,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:14,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:18:14,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:14,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:18:14,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:18:14,110 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 15:18:15,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:15,394 INFO L93 Difference]: Finished difference Result 54603 states and 76660 transitions. [2023-12-02 15:18:15,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:18:15,394 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 15:18:15,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:15,446 INFO L225 Difference]: With dead ends: 54603 [2023-12-02 15:18:15,447 INFO L226 Difference]: Without dead ends: 33151 [2023-12-02 15:18:15,471 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 15:18:15,472 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 15:18:15,472 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 15:18:15,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33151 states. [2023-12-02 15:18:16,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33151 to 27295. [2023-12-02 15:18:16,469 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 15:18:16,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27295 states to 27295 states and 38765 transitions. [2023-12-02 15:18:16,521 INFO L78 Accepts]: Start accepts. Automaton has 27295 states and 38765 transitions. Word has length 136 [2023-12-02 15:18:16,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:16,522 INFO L495 AbstractCegarLoop]: Abstraction has 27295 states and 38765 transitions. [2023-12-02 15:18:16,522 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 15:18:16,522 INFO L276 IsEmpty]: Start isEmpty. Operand 27295 states and 38765 transitions. [2023-12-02 15:18:16,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 15:18:16,560 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:16,560 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 15:18:16,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 15:18:16,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 15:18:16,761 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:16,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:16,762 INFO L85 PathProgramCache]: Analyzing trace with hash 123282547, now seen corresponding path program 1 times [2023-12-02 15:18:16,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:16,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764429241] [2023-12-02 15:18:16,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:16,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:16,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:17,198 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 15:18:17,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:17,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764429241] [2023-12-02 15:18:17,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764429241] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:17,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737856787] [2023-12-02 15:18:17,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:17,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:17,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:17,200 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:17,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 15:18:17,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:17,397 INFO L262 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 15:18:17,401 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:17,506 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 15:18:17,506 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:18:18,991 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 15:18:18,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737856787] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:18:18,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026445024] [2023-12-02 15:18:18,995 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2023-12-02 15:18:18,995 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:18:18,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:18:18,996 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:18:18,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:18:27,779 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 15:18:27,781 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 155 for LOIs [2023-12-02 15:18:27,872 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 15:18:27,985 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 15:18:27,986 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 15:18:28,000 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 15:18:28,074 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 15:18:28,178 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:18:39,477 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 15:18:39,478 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:18:39,478 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:18:39,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 6] total 16 [2023-12-02 15:18:39,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085747527] [2023-12-02 15:18:39,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:18:39,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 15:18:39,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:39,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 15:18:39,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=5147, Unknown=0, NotChecked=0, Total=5550 [2023-12-02 15:18:39,482 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 15:18:47,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:47,745 INFO L93 Difference]: Finished difference Result 88480 states and 126388 transitions. [2023-12-02 15:18:47,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2023-12-02 15:18:47,746 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 15:18:47,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:47,855 INFO L225 Difference]: With dead ends: 88480 [2023-12-02 15:18:47,856 INFO L226 Difference]: Without dead ends: 62832 [2023-12-02 15:18:47,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 416 SyntacticMatches, 4 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13801 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=2767, Invalid=33523, Unknown=0, NotChecked=0, Total=36290 [2023-12-02 15:18:47,896 INFO L413 NwaCegarLoop]: 3711 mSDtfsCounter, 11843 mSDsluCounter, 29238 mSDsCounter, 0 mSdLazyCounter, 4794 mSolverCounterSat, 429 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11849 SdHoareTripleChecker+Valid, 32949 SdHoareTripleChecker+Invalid, 5223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 429 IncrementalHoareTripleChecker+Valid, 4794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:18:47,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11849 Valid, 32949 Invalid, 5223 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [429 Valid, 4794 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-12-02 15:18:47,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62832 states. [2023-12-02 15:18:49,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62832 to 43529. [2023-12-02 15:18:49,686 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 15:18:49,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43529 states to 43529 states and 60545 transitions. [2023-12-02 15:18:49,760 INFO L78 Accepts]: Start accepts. Automaton has 43529 states and 60545 transitions. Word has length 141 [2023-12-02 15:18:49,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:49,761 INFO L495 AbstractCegarLoop]: Abstraction has 43529 states and 60545 transitions. [2023-12-02 15:18:49,761 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 15:18:49,761 INFO L276 IsEmpty]: Start isEmpty. Operand 43529 states and 60545 transitions. [2023-12-02 15:18:49,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 15:18:49,798 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:49,798 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 15:18:49,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 15:18:49,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 15:18:49,999 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:49,999 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:49,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1599130227, now seen corresponding path program 1 times [2023-12-02 15:18:49,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:49,999 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090351295] [2023-12-02 15:18:50,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:50,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:50,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:50,188 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 15:18:50,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:50,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090351295] [2023-12-02 15:18:50,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090351295] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:50,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964791844] [2023-12-02 15:18:50,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:50,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:50,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:50,190 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:50,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 15:18:50,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:50,370 INFO L262 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 15:18:50,373 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:50,411 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 15:18:50,411 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:50,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964791844] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:50,411 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:50,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 15:18:50,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548382843] [2023-12-02 15:18:50,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:50,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:18:50,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:50,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:18:50,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:18:50,413 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 15:18:52,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:52,246 INFO L93 Difference]: Finished difference Result 61522 states and 85196 transitions. [2023-12-02 15:18:52,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:18:52,247 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 15:18:52,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:52,315 INFO L225 Difference]: With dead ends: 61522 [2023-12-02 15:18:52,315 INFO L226 Difference]: Without dead ends: 44584 [2023-12-02 15:18:52,344 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 15:18:52,345 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 15:18:52,345 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 15:18:52,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44584 states. [2023-12-02 15:18:54,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44584 to 44401. [2023-12-02 15:18:54,037 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 15:18:54,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44401 states to 44401 states and 61625 transitions. [2023-12-02 15:18:54,110 INFO L78 Accepts]: Start accepts. Automaton has 44401 states and 61625 transitions. Word has length 142 [2023-12-02 15:18:54,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:54,110 INFO L495 AbstractCegarLoop]: Abstraction has 44401 states and 61625 transitions. [2023-12-02 15:18:54,110 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 15:18:54,110 INFO L276 IsEmpty]: Start isEmpty. Operand 44401 states and 61625 transitions. [2023-12-02 15:18:54,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 15:18:54,145 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:54,146 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 15:18:54,151 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 15:18:54,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 15:18:54,346 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:54,346 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:54,347 INFO L85 PathProgramCache]: Analyzing trace with hash -1849343260, now seen corresponding path program 1 times [2023-12-02 15:18:54,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:54,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025694077] [2023-12-02 15:18:54,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:54,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:54,520 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 15:18:54,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:54,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025694077] [2023-12-02 15:18:54,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025694077] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:54,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674175862] [2023-12-02 15:18:54,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:54,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:54,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:54,522 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:54,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 15:18:54,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:54,681 INFO L262 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:18:54,684 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:54,699 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 15:18:54,699 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:54,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674175862] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:54,699 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:54,700 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:18:54,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699702218] [2023-12-02 15:18:54,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:54,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:18:54,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:54,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:18:54,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:18:54,701 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 15:18:56,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:18:56,682 INFO L93 Difference]: Finished difference Result 61655 states and 85504 transitions. [2023-12-02 15:18:56,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:18:56,682 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 15:18:56,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:18:56,749 INFO L225 Difference]: With dead ends: 61655 [2023-12-02 15:18:56,749 INFO L226 Difference]: Without dead ends: 43361 [2023-12-02 15:18:56,767 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 15:18:56,767 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, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:18:56,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 6410 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:18:56,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43361 states. [2023-12-02 15:18:58,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43361 to 41865. [2023-12-02 15:18:58,282 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 15:18:58,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41865 states to 41865 states and 58457 transitions. [2023-12-02 15:18:58,351 INFO L78 Accepts]: Start accepts. Automaton has 41865 states and 58457 transitions. Word has length 143 [2023-12-02 15:18:58,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:18:58,352 INFO L495 AbstractCegarLoop]: Abstraction has 41865 states and 58457 transitions. [2023-12-02 15:18:58,352 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 15:18:58,352 INFO L276 IsEmpty]: Start isEmpty. Operand 41865 states and 58457 transitions. [2023-12-02 15:18:58,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 15:18:58,458 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:18:58,458 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 15:18:58,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 15:18:58,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 15:18:58,659 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:18:58,659 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:18:58,660 INFO L85 PathProgramCache]: Analyzing trace with hash 725688429, now seen corresponding path program 1 times [2023-12-02 15:18:58,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:18:58,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004525421] [2023-12-02 15:18:58,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:58,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:18:58,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:58,932 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 15:18:58,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:18:58,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004525421] [2023-12-02 15:18:58,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004525421] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:18:58,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267858055] [2023-12-02 15:18:58,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:18:58,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:18:58,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:18:58,934 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:18:58,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 15:18:59,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:18:59,111 INFO L262 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:18:59,114 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:18:59,177 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 15:18:59,177 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:18:59,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267858055] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:18:59,178 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:18:59,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2023-12-02 15:18:59,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643235195] [2023-12-02 15:18:59,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:18:59,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:18:59,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:18:59,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:18:59,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:18:59,179 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 15:19:02,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:02,097 INFO L93 Difference]: Finished difference Result 95596 states and 132114 transitions. [2023-12-02 15:19:02,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:19:02,098 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 15:19:02,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:02,192 INFO L225 Difference]: With dead ends: 95596 [2023-12-02 15:19:02,192 INFO L226 Difference]: Without dead ends: 55428 [2023-12-02 15:19:02,220 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 15:19:02,220 INFO L413 NwaCegarLoop]: 3195 mSDtfsCounter, 3667 mSDsluCounter, 6375 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:19:02,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3681 Valid, 9570 Invalid, 918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:19:02,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55428 states. [2023-12-02 15:19:04,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55428 to 55424. [2023-12-02 15:19:04,693 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 15:19:04,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55424 states to 55424 states and 76260 transitions. [2023-12-02 15:19:04,788 INFO L78 Accepts]: Start accepts. Automaton has 55424 states and 76260 transitions. Word has length 144 [2023-12-02 15:19:04,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:19:04,788 INFO L495 AbstractCegarLoop]: Abstraction has 55424 states and 76260 transitions. [2023-12-02 15:19:04,788 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 15:19:04,788 INFO L276 IsEmpty]: Start isEmpty. Operand 55424 states and 76260 transitions. [2023-12-02 15:19:04,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 15:19:04,831 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:19:04,832 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 15:19:04,837 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 15:19:05,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 15:19:05,032 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:19:05,033 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:19:05,033 INFO L85 PathProgramCache]: Analyzing trace with hash -910888191, now seen corresponding path program 1 times [2023-12-02 15:19:05,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:19:05,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029600970] [2023-12-02 15:19:05,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:05,033 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:19:05,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:05,190 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 15:19:05,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:19:05,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029600970] [2023-12-02 15:19:05,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029600970] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:19:05,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067843106] [2023-12-02 15:19:05,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:05,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:05,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:19:05,192 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:19:05,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 15:19:05,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:05,328 INFO L262 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:19:05,330 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:19:05,361 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 15:19:05,361 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:19:05,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067843106] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:19:05,361 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:19:05,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 15:19:05,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293276902] [2023-12-02 15:19:05,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:19:05,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:19:05,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:19:05,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:19:05,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:19:05,363 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 15:19:07,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:07,866 INFO L93 Difference]: Finished difference Result 94351 states and 130422 transitions. [2023-12-02 15:19:07,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:19:07,866 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 15:19:07,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:07,956 INFO L225 Difference]: With dead ends: 94351 [2023-12-02 15:19:07,956 INFO L226 Difference]: Without dead ends: 55506 [2023-12-02 15:19:07,986 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 15:19:07,987 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, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:19:07,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 6498 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 503 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:19:08,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55506 states. [2023-12-02 15:19:10,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55506 to 54888. [2023-12-02 15:19:10,643 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 15:19:10,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54888 states to 54888 states and 74736 transitions. [2023-12-02 15:19:10,826 INFO L78 Accepts]: Start accepts. Automaton has 54888 states and 74736 transitions. Word has length 148 [2023-12-02 15:19:10,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:19:10,826 INFO L495 AbstractCegarLoop]: Abstraction has 54888 states and 74736 transitions. [2023-12-02 15:19:10,827 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 15:19:10,827 INFO L276 IsEmpty]: Start isEmpty. Operand 54888 states and 74736 transitions. [2023-12-02 15:19:10,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 15:19:10,867 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:19:10,868 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 15:19:10,873 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 15:19:11,068 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:11,068 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:19:11,069 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:19:11,069 INFO L85 PathProgramCache]: Analyzing trace with hash 607800353, now seen corresponding path program 1 times [2023-12-02 15:19:11,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:19:11,069 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126697052] [2023-12-02 15:19:11,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:11,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:19:11,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:11,234 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 15:19:11,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:19:11,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126697052] [2023-12-02 15:19:11,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126697052] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:19:11,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916368529] [2023-12-02 15:19:11,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:11,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:11,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:19:11,236 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:19:11,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 15:19:11,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:11,399 INFO L262 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:19:11,401 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:19:11,466 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 15:19:11,466 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:19:11,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916368529] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:19:11,467 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:19:11,467 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-12-02 15:19:11,467 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446772679] [2023-12-02 15:19:11,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:19:11,467 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:19:11,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:19:11,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:19:11,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:19:11,468 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 15:19:15,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:15,721 INFO L93 Difference]: Finished difference Result 132375 states and 177961 transitions. [2023-12-02 15:19:15,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:19:15,722 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 15:19:15,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:15,852 INFO L225 Difference]: With dead ends: 132375 [2023-12-02 15:19:15,852 INFO L226 Difference]: Without dead ends: 79184 [2023-12-02 15:19:15,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-12-02 15:19:15,889 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, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 15:19:15,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7000 Valid, 9494 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 15:19:15,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79184 states. [2023-12-02 15:19:20,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79184 to 79180. [2023-12-02 15:19:20,507 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 15:19:20,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79180 states to 79180 states and 105087 transitions. [2023-12-02 15:19:20,621 INFO L78 Accepts]: Start accepts. Automaton has 79180 states and 105087 transitions. Word has length 148 [2023-12-02 15:19:20,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:19:20,622 INFO L495 AbstractCegarLoop]: Abstraction has 79180 states and 105087 transitions. [2023-12-02 15:19:20,622 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 15:19:20,622 INFO L276 IsEmpty]: Start isEmpty. Operand 79180 states and 105087 transitions. [2023-12-02 15:19:20,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-12-02 15:19:20,671 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:19:20,671 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 15:19:20,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 15:19:20,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:20,872 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:19:20,872 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:19:20,872 INFO L85 PathProgramCache]: Analyzing trace with hash 349177305, now seen corresponding path program 1 times [2023-12-02 15:19:20,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:19:20,872 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7842719] [2023-12-02 15:19:20,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:20,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:19:20,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:20,943 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 15:19:20,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:19:20,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7842719] [2023-12-02 15:19:20,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7842719] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:19:20,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134497172] [2023-12-02 15:19:20,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:20,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:20,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:19:20,945 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:19:20,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 15:19:21,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:21,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 15:19:21,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:19:21,103 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 15:19:21,103 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:19:21,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134497172] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:19:21,103 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:19:21,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-12-02 15:19:21,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158770856] [2023-12-02 15:19:21,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:19:21,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:19:21,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:19:21,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:19:21,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:19:21,105 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 15:19:26,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:26,749 INFO L93 Difference]: Finished difference Result 149043 states and 197994 transitions. [2023-12-02 15:19:26,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:19:26,750 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 15:19:26,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:26,909 INFO L225 Difference]: With dead ends: 149043 [2023-12-02 15:19:26,909 INFO L226 Difference]: Without dead ends: 96503 [2023-12-02 15:19:26,951 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 15:19:26,952 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 15:19:26,952 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 15:19:27,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96503 states. [2023-12-02 15:19:31,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96503 to 91292. [2023-12-02 15:19:31,488 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 15:19:31,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91292 states to 91292 states and 121198 transitions. [2023-12-02 15:19:31,645 INFO L78 Accepts]: Start accepts. Automaton has 91292 states and 121198 transitions. Word has length 148 [2023-12-02 15:19:31,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:19:31,645 INFO L495 AbstractCegarLoop]: Abstraction has 91292 states and 121198 transitions. [2023-12-02 15:19:31,645 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 15:19:31,645 INFO L276 IsEmpty]: Start isEmpty. Operand 91292 states and 121198 transitions. [2023-12-02 15:19:31,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 15:19:31,708 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:19:31,709 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 15:19:31,714 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 15:19:31,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 15:19:31,910 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:19:31,910 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:19:31,910 INFO L85 PathProgramCache]: Analyzing trace with hash -1462932002, now seen corresponding path program 1 times [2023-12-02 15:19:31,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:19:31,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337623999] [2023-12-02 15:19:31,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:31,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:19:31,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:32,029 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 15:19:32,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:19:32,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337623999] [2023-12-02 15:19:32,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337623999] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:19:32,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496833478] [2023-12-02 15:19:32,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:32,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:32,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:19:32,031 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:19:32,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 15:19:32,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:32,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:19:32,196 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:19:32,254 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 15:19:32,254 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:19:32,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496833478] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:19:32,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:19:32,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2023-12-02 15:19:32,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790295501] [2023-12-02 15:19:32,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:19:32,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:19:32,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:19:32,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:19:32,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:19:32,256 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 15:19:40,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:40,099 INFO L93 Difference]: Finished difference Result 222485 states and 292025 transitions. [2023-12-02 15:19:40,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:19:40,099 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 15:19:40,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:40,372 INFO L225 Difference]: With dead ends: 222485 [2023-12-02 15:19:40,372 INFO L226 Difference]: Without dead ends: 132890 [2023-12-02 15:19:40,462 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 15:19:40,463 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, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:19:40,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7063 Valid, 9493 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 774 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:19:40,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132890 states. [2023-12-02 15:19:48,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132890 to 132886. [2023-12-02 15:19:48,492 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 15:19:48,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132886 states to 132886 states and 171509 transitions. [2023-12-02 15:19:48,839 INFO L78 Accepts]: Start accepts. Automaton has 132886 states and 171509 transitions. Word has length 152 [2023-12-02 15:19:48,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:19:48,840 INFO L495 AbstractCegarLoop]: Abstraction has 132886 states and 171509 transitions. [2023-12-02 15:19:48,840 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 15:19:48,840 INFO L276 IsEmpty]: Start isEmpty. Operand 132886 states and 171509 transitions. [2023-12-02 15:19:48,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 15:19:48,935 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:19:48,935 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 15:19:48,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-12-02 15:19:49,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 15:19:49,136 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:19:49,136 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:19:49,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1455010030, now seen corresponding path program 1 times [2023-12-02 15:19:49,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:19:49,136 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421434924] [2023-12-02 15:19:49,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:49,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:19:49,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:49,278 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 15:19:49,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:19:49,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421434924] [2023-12-02 15:19:49,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421434924] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:19:49,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888669368] [2023-12-02 15:19:49,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:19:49,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:19:49,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:19:49,280 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:19:49,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 15:19:49,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:19:49,478 INFO L262 TraceCheckSpWp]: Trace formula consists of 781 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 15:19:49,481 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:19:49,512 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 15:19:49,512 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:19:49,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888669368] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:19:49,512 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:19:49,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-12-02 15:19:49,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168495107] [2023-12-02 15:19:49,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:19:49,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:19:49,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:19:49,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:19:49,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:19:49,514 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 15:19:57,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:19:57,258 INFO L93 Difference]: Finished difference Result 242063 states and 312548 transitions. [2023-12-02 15:19:57,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:19:57,259 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 15:19:57,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:19:57,527 INFO L225 Difference]: With dead ends: 242063 [2023-12-02 15:19:57,527 INFO L226 Difference]: Without dead ends: 151101 [2023-12-02 15:19:57,603 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 15:19:57,604 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 15:19:57,604 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 15:19:57,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151101 states. [2023-12-02 15:20:05,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151101 to 146648. [2023-12-02 15:20:05,940 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 15:20:06,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146648 states to 146648 states and 189679 transitions. [2023-12-02 15:20:06,340 INFO L78 Accepts]: Start accepts. Automaton has 146648 states and 189679 transitions. Word has length 153 [2023-12-02 15:20:06,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:20:06,341 INFO L495 AbstractCegarLoop]: Abstraction has 146648 states and 189679 transitions. [2023-12-02 15:20:06,341 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 15:20:06,341 INFO L276 IsEmpty]: Start isEmpty. Operand 146648 states and 189679 transitions. [2023-12-02 15:20:06,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2023-12-02 15:20:06,439 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:20:06,439 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 15:20:06,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 15:20:06,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 15:20:06,640 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:20:06,641 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:20:06,641 INFO L85 PathProgramCache]: Analyzing trace with hash 969594509, now seen corresponding path program 2 times [2023-12-02 15:20:06,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:20:06,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118925387] [2023-12-02 15:20:06,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:20:06,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:20:06,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:20:06,695 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 15:20:06,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:20:06,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118925387] [2023-12-02 15:20:06,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118925387] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:20:06,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73523241] [2023-12-02 15:20:06,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:20:06,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:20:06,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:20:06,697 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:20:06,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 15:20:06,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 15:20:06,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:20:06,816 INFO L262 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:20:06,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:20:06,852 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 15:20:06,852 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:20:06,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73523241] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:20:06,852 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:20:06,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 15:20:06,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830039713] [2023-12-02 15:20:06,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:20:06,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:20:06,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:20:06,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:20:06,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:20:06,854 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 15:20:19,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:20:19,454 INFO L93 Difference]: Finished difference Result 340861 states and 444372 transitions. [2023-12-02 15:20:19,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:20:19,454 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 15:20:19,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:20:20,025 INFO L225 Difference]: With dead ends: 340861 [2023-12-02 15:20:20,025 INFO L226 Difference]: Without dead ends: 236150 [2023-12-02 15:20:20,132 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 15:20:20,133 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 15:20:20,133 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 15:20:20,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236150 states. [2023-12-02 15:20:33,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236150 to 232144. [2023-12-02 15:20:33,673 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 15:20:34,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232144 states to 232144 states and 299243 transitions. [2023-12-02 15:20:34,364 INFO L78 Accepts]: Start accepts. Automaton has 232144 states and 299243 transitions. Word has length 153 [2023-12-02 15:20:34,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:20:34,365 INFO L495 AbstractCegarLoop]: Abstraction has 232144 states and 299243 transitions. [2023-12-02 15:20:34,365 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 15:20:34,365 INFO L276 IsEmpty]: Start isEmpty. Operand 232144 states and 299243 transitions. [2023-12-02 15:20:34,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 15:20:34,543 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:20:34,544 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 15:20:34,549 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 15:20:34,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 15:20:34,744 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:20:34,745 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:20:34,745 INFO L85 PathProgramCache]: Analyzing trace with hash -817428902, now seen corresponding path program 1 times [2023-12-02 15:20:34,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:20:34,745 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566693489] [2023-12-02 15:20:34,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:20:34,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:20:34,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:20:34,793 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 15:20:34,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:20:34,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566693489] [2023-12-02 15:20:34,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566693489] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:20:34,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17213280] [2023-12-02 15:20:34,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:20:34,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:20:34,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:20:34,795 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:20:34,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 15:20:34,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:20:34,959 INFO L262 TraceCheckSpWp]: Trace formula consists of 780 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:20:34,962 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:20:35,010 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 15:20:35,010 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:20:35,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17213280] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:20:35,010 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:20:35,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 15:20:35,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120819203] [2023-12-02 15:20:35,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:20:35,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:20:35,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:20:35,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:20:35,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:20:35,012 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 15:20:49,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:20:49,003 INFO L93 Difference]: Finished difference Result 423551 states and 546528 transitions. [2023-12-02 15:20:49,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:20:49,003 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 15:20:49,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:20:49,653 INFO L225 Difference]: With dead ends: 423551 [2023-12-02 15:20:49,653 INFO L226 Difference]: Without dead ends: 230301 [2023-12-02 15:20:49,874 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 15:20:49,874 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 15:20:49,875 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 15:20:50,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230301 states. [2023-12-02 15:21:03,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230301 to 229999. [2023-12-02 15:21:03,597 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 15:21:04,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229999 states to 229999 states and 294478 transitions. [2023-12-02 15:21:04,343 INFO L78 Accepts]: Start accepts. Automaton has 229999 states and 294478 transitions. Word has length 154 [2023-12-02 15:21:04,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:21:04,343 INFO L495 AbstractCegarLoop]: Abstraction has 229999 states and 294478 transitions. [2023-12-02 15:21:04,344 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 15:21:04,344 INFO L276 IsEmpty]: Start isEmpty. Operand 229999 states and 294478 transitions. [2023-12-02 15:21:04,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 15:21:04,518 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:21:04,518 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 15:21:04,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 15:21:04,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 15:21:04,719 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:21:04,719 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:21:04,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1706067419, now seen corresponding path program 1 times [2023-12-02 15:21:04,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:21:04,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033766998] [2023-12-02 15:21:04,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:21:04,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:21:04,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:21:04,770 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 15:21:04,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:21:04,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033766998] [2023-12-02 15:21:04,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033766998] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:21:04,770 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:21:04,770 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 15:21:04,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961367829] [2023-12-02 15:21:04,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:21:04,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:21:04,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:21:04,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:21:04,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:21:04,772 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 15:21:15,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:21:15,253 INFO L93 Difference]: Finished difference Result 332626 states and 428601 transitions. [2023-12-02 15:21:15,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:21:15,253 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 15:21:15,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:21:15,690 INFO L225 Difference]: With dead ends: 332626 [2023-12-02 15:21:15,690 INFO L226 Difference]: Without dead ends: 142924 [2023-12-02 15:21:15,846 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 15:21:15,846 INFO L413 NwaCegarLoop]: 3319 mSDtfsCounter, 3542 mSDsluCounter, 3249 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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 15:21:15,847 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 15:21:15,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142924 states. [2023-12-02 15:21:24,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142924 to 140427. [2023-12-02 15:21:24,978 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 15:21:25,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140427 states to 140427 states and 177321 transitions. [2023-12-02 15:21:25,248 INFO L78 Accepts]: Start accepts. Automaton has 140427 states and 177321 transitions. Word has length 154 [2023-12-02 15:21:25,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:21:25,249 INFO L495 AbstractCegarLoop]: Abstraction has 140427 states and 177321 transitions. [2023-12-02 15:21:25,249 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 15:21:25,249 INFO L276 IsEmpty]: Start isEmpty. Operand 140427 states and 177321 transitions. [2023-12-02 15:21:25,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:21:25,351 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:21:25,352 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 15:21:25,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-12-02 15:21:25,352 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:21:25,352 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:21:25,352 INFO L85 PathProgramCache]: Analyzing trace with hash 996836042, now seen corresponding path program 2 times [2023-12-02 15:21:25,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:21:25,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583227609] [2023-12-02 15:21:25,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:21:25,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:21:25,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:21:25,982 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 15:21:25,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:21:25,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583227609] [2023-12-02 15:21:25,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583227609] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:21:25,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545940021] [2023-12-02 15:21:25,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:21:25,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:21:25,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:21:25,983 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:21:25,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 15:21:26,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 15:21:26,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:21:26,128 INFO L262 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 15:21:26,132 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:21:26,395 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 15:21:26,396 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:21:26,561 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 15:21:26,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545940021] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 15:21:26,562 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 15:21:26,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13, 7] total 21 [2023-12-02 15:21:26,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534148167] [2023-12-02 15:21:26,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:21:26,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:21:26,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:21:26,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:21:26,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2023-12-02 15:21:26,563 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 15:21:36,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:21:36,374 INFO L93 Difference]: Finished difference Result 251653 states and 318670 transitions. [2023-12-02 15:21:36,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 15:21:36,375 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 15:21:36,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:21:36,792 INFO L225 Difference]: With dead ends: 251653 [2023-12-02 15:21:36,792 INFO L226 Difference]: Without dead ends: 152475 [2023-12-02 15:21:36,867 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 15:21:36,868 INFO L413 NwaCegarLoop]: 3251 mSDtfsCounter, 3423 mSDsluCounter, 3245 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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 15:21:36,869 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 15:21:36,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152475 states. [2023-12-02 15:21:46,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152475 to 151169. [2023-12-02 15:21:46,322 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 15:21:46,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151169 states to 151169 states and 189005 transitions. [2023-12-02 15:21:46,765 INFO L78 Accepts]: Start accepts. Automaton has 151169 states and 189005 transitions. Word has length 155 [2023-12-02 15:21:46,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:21:46,765 INFO L495 AbstractCegarLoop]: Abstraction has 151169 states and 189005 transitions. [2023-12-02 15:21:46,766 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 15:21:46,766 INFO L276 IsEmpty]: Start isEmpty. Operand 151169 states and 189005 transitions. [2023-12-02 15:21:46,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-12-02 15:21:46,863 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:21:46,864 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 15:21:46,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 15:21:47,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:21:47,064 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:21:47,065 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:21:47,065 INFO L85 PathProgramCache]: Analyzing trace with hash 1588368072, now seen corresponding path program 1 times [2023-12-02 15:21:47,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:21:47,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382986363] [2023-12-02 15:21:47,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:21:47,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:21:47,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:21:47,111 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 15:21:47,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:21:47,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382986363] [2023-12-02 15:21:47,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382986363] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:21:47,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1463894060] [2023-12-02 15:21:47,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:21:47,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:21:47,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:21:47,113 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:21:47,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 15:21:47,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:21:47,249 INFO L262 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:21:47,252 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:21:47,280 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 15:21:47,280 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:21:47,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1463894060] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:21:47,280 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:21:47,280 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2023-12-02 15:21:47,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339695832] [2023-12-02 15:21:47,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:21:47,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:21:47,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:21:47,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:21:47,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 15:21:47,281 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 15:21:56,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:21:56,203 INFO L93 Difference]: Finished difference Result 257760 states and 324458 transitions. [2023-12-02 15:21:56,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 15:21:56,204 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 15:21:56,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:21:56,503 INFO L225 Difference]: With dead ends: 257760 [2023-12-02 15:21:56,503 INFO L226 Difference]: Without dead ends: 150993 [2023-12-02 15:21:56,603 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 15:21:56,604 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 15:21:56,604 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 15:21:56,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150993 states. [2023-12-02 15:22:05,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150993 to 149091. [2023-12-02 15:22:05,697 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 15:22:05,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149091 states to 149091 states and 183697 transitions. [2023-12-02 15:22:05,972 INFO L78 Accepts]: Start accepts. Automaton has 149091 states and 183697 transitions. Word has length 155 [2023-12-02 15:22:05,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:22:05,973 INFO L495 AbstractCegarLoop]: Abstraction has 149091 states and 183697 transitions. [2023-12-02 15:22:05,973 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 15:22:05,973 INFO L276 IsEmpty]: Start isEmpty. Operand 149091 states and 183697 transitions. [2023-12-02 15:22:06,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-12-02 15:22:06,079 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:22:06,079 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 15:22:06,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 15:22:06,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 15:22:06,280 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:22:06,280 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:22:06,280 INFO L85 PathProgramCache]: Analyzing trace with hash -630793522, now seen corresponding path program 1 times [2023-12-02 15:22:06,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:22:06,280 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271351198] [2023-12-02 15:22:06,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:22:06,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:22:06,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:22:06,616 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 15:22:06,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:22:06,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271351198] [2023-12-02 15:22:06,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271351198] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:22:06,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025568262] [2023-12-02 15:22:06,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:22:06,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:22:06,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:22:06,617 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:22:06,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 15:22:06,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:22:06,768 INFO L262 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 15:22:06,770 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:22:06,844 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 15:22:06,844 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:22:06,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025568262] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:22:06,844 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:22:06,844 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2023-12-02 15:22:06,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93648118] [2023-12-02 15:22:06,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:22:06,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:22:06,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:22:06,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:22:06,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2023-12-02 15:22:06,845 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 15:22:19,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:22:19,976 INFO L93 Difference]: Finished difference Result 284063 states and 349824 transitions. [2023-12-02 15:22:19,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:22:19,976 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 15:22:19,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:22:20,349 INFO L225 Difference]: With dead ends: 284063 [2023-12-02 15:22:20,349 INFO L226 Difference]: Without dead ends: 182714 [2023-12-02 15:22:20,434 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 15:22:20,435 INFO L413 NwaCegarLoop]: 3300 mSDtfsCounter, 278 mSDsluCounter, 12653 mSDsCounter, 0 mSdLazyCounter, 1389 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s 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, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 15:22:20,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 15953 Invalid, 1438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1389 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 15:22:20,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182714 states. [2023-12-02 15:22:31,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182714 to 160168. [2023-12-02 15:22:31,524 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 15:22:31,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160168 states to 160168 states and 196508 transitions. [2023-12-02 15:22:31,820 INFO L78 Accepts]: Start accepts. Automaton has 160168 states and 196508 transitions. Word has length 157 [2023-12-02 15:22:31,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:22:31,821 INFO L495 AbstractCegarLoop]: Abstraction has 160168 states and 196508 transitions. [2023-12-02 15:22:31,821 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 15:22:31,821 INFO L276 IsEmpty]: Start isEmpty. Operand 160168 states and 196508 transitions. [2023-12-02 15:22:31,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 15:22:31,910 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:22:31,911 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 15:22:31,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 15:22:32,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 15:22:32,111 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:22:32,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:22:32,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1815247174, now seen corresponding path program 1 times [2023-12-02 15:22:32,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:22:32,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246693928] [2023-12-02 15:22:32,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:22:32,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:22:32,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:22:32,543 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 15:22:32,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:22:32,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246693928] [2023-12-02 15:22:32,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246693928] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:22:32,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221147996] [2023-12-02 15:22:32,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:22:32,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:22:32,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:22:32,545 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:22:32,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 15:22:32,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:22:32,709 INFO L262 TraceCheckSpWp]: Trace formula consists of 854 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 15:22:32,714 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:22:32,867 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 15:22:32,867 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:22:34,541 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 15:22:34,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221147996] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:22:34,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868686869] [2023-12-02 15:22:34,545 INFO L159 IcfgInterpreter]: Started Sifa with 88 locations of interest [2023-12-02 15:22:34,545 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:22:34,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:22:34,546 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:22:34,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:22:45,364 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 15:22:45,365 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 1 for LOIs [2023-12-02 15:22:45,373 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 15:22:45,487 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 15:22:45,488 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 15:22:45,504 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 15:22:45,595 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 15:22:45,651 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:23:02,457 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 15:23:02,457 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:23:02,457 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:23:02,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 6] total 17 [2023-12-02 15:23:02,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728775195] [2023-12-02 15:23:02,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:23:02,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 15:23:02,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:23:02,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 15:23:02,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=7384, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 15:23:02,463 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 15:23:27,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:23:27,947 INFO L93 Difference]: Finished difference Result 392736 states and 493150 transitions. [2023-12-02 15:23:27,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2023-12-02 15:23:27,948 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 15:23:27,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:23:28,761 INFO L225 Difference]: With dead ends: 392736 [2023-12-02 15:23:28,761 INFO L226 Difference]: Without dead ends: 258729 [2023-12-02 15:23:28,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 716 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27070 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=4793, Invalid=59469, Unknown=0, NotChecked=0, Total=64262 [2023-12-02 15:23:28,907 INFO L413 NwaCegarLoop]: 4147 mSDtfsCounter, 20614 mSDsluCounter, 24397 mSDsCounter, 0 mSdLazyCounter, 5015 mSolverCounterSat, 686 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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, 2.7s IncrementalHoareTripleChecker+Time [2023-12-02 15:23:28,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20630 Valid, 28544 Invalid, 5701 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [686 Valid, 5015 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-12-02 15:23:29,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258729 states. [2023-12-02 15:23:39,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258729 to 138312. [2023-12-02 15:23:40,031 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 15:23:40,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138312 states to 138312 states and 169263 transitions. [2023-12-02 15:23:40,280 INFO L78 Accepts]: Start accepts. Automaton has 138312 states and 169263 transitions. Word has length 152 [2023-12-02 15:23:40,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:23:40,281 INFO L495 AbstractCegarLoop]: Abstraction has 138312 states and 169263 transitions. [2023-12-02 15:23:40,281 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 15:23:40,281 INFO L276 IsEmpty]: Start isEmpty. Operand 138312 states and 169263 transitions. [2023-12-02 15:23:40,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 15:23:40,362 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:23:40,362 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 15:23:40,369 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 15:23:40,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:23:40,563 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:23:40,563 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:23:40,563 INFO L85 PathProgramCache]: Analyzing trace with hash 760447075, now seen corresponding path program 1 times [2023-12-02 15:23:40,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:23:40,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832164582] [2023-12-02 15:23:40,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:23:40,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:23:40,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:23:40,819 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 15:23:40,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:23:40,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832164582] [2023-12-02 15:23:40,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832164582] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:23:40,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023639980] [2023-12-02 15:23:40,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:23:40,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:23:40,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:23:40,821 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:23:40,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 15:23:40,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:23:40,986 INFO L262 TraceCheckSpWp]: Trace formula consists of 864 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 15:23:40,989 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:23:41,171 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 15:23:41,171 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:23:42,809 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 15:23:42,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023639980] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:23:42,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [235440591] [2023-12-02 15:23:42,812 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2023-12-02 15:23:42,812 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:23:42,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:23:42,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:23:42,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:23:53,922 INFO L197 IcfgInterpreter]: Interpreting procedure error with input of size 12 for LOIs [2023-12-02 15:23:53,923 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 155 for LOIs [2023-12-02 15:23:54,017 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2023-12-02 15:23:54,134 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 1 for LOIs [2023-12-02 15:23:54,135 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 1 for LOIs [2023-12-02 15:23:54,151 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 49 for LOIs [2023-12-02 15:23:54,358 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 1 for LOIs [2023-12-02 15:23:54,538 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:24:18,635 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 15:24:18,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:24:18,635 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:24:18,636 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 6] total 18 [2023-12-02 15:24:18,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654320071] [2023-12-02 15:24:18,636 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:24:18,637 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 15:24:18,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:24:18,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 15:24:18,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=7802, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 15:24:18,638 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 15:25:00,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:25:00,398 INFO L93 Difference]: Finished difference Result 393323 states and 498575 transitions. [2023-12-02 15:25:00,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2023-12-02 15:25:00,399 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 15:25:00,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:25:01,339 INFO L225 Difference]: With dead ends: 393323 [2023-12-02 15:25:01,340 INFO L226 Difference]: Without dead ends: 300107 [2023-12-02 15:25:01,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 749 GetRequests, 475 SyntacticMatches, 2 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31531 ImplicationChecksByTransitivity, 29.1s TimeCoverageRelationStatistics Valid=4775, Invalid=70027, Unknown=0, NotChecked=0, Total=74802 [2023-12-02 15:25:01,476 INFO L413 NwaCegarLoop]: 3975 mSDtfsCounter, 20435 mSDsluCounter, 31590 mSDsCounter, 0 mSdLazyCounter, 6455 mSolverCounterSat, 698 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s 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, 4.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:25:01,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20447 Valid, 35565 Invalid, 7153 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [698 Valid, 6455 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-12-02 15:25:01,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300107 states. [2023-12-02 15:25:14,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300107 to 133976. [2023-12-02 15:25:14,808 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 15:25:15,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133976 states to 133976 states and 163983 transitions. [2023-12-02 15:25:15,052 INFO L78 Accepts]: Start accepts. Automaton has 133976 states and 163983 transitions. Word has length 154 [2023-12-02 15:25:15,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:25:15,053 INFO L495 AbstractCegarLoop]: Abstraction has 133976 states and 163983 transitions. [2023-12-02 15:25:15,053 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 15:25:15,053 INFO L276 IsEmpty]: Start isEmpty. Operand 133976 states and 163983 transitions. [2023-12-02 15:25:15,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 15:25:15,141 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:25:15,141 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 15:25:15,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 15:25:15,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:25:15,342 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:25:15,343 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:25:15,343 INFO L85 PathProgramCache]: Analyzing trace with hash 345965600, now seen corresponding path program 1 times [2023-12-02 15:25:15,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:25:15,343 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25857833] [2023-12-02 15:25:15,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:25:15,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:25:15,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:25:15,483 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 15:25:15,483 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:25:15,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25857833] [2023-12-02 15:25:15,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25857833] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:25:15,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851522675] [2023-12-02 15:25:15,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:25:15,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:25:15,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:25:15,485 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:25:15,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 15:25:15,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:25:15,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 15:25:15,658 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:25:15,681 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 15:25:15,681 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:25:15,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851522675] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:25:15,681 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:25:15,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2023-12-02 15:25:15,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977804431] [2023-12-02 15:25:15,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:25:15,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 15:25:15,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:25:15,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 15:25:15,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:25:15,683 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 15:25:28,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:25:28,920 INFO L93 Difference]: Finished difference Result 254560 states and 311195 transitions. [2023-12-02 15:25:28,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:25:28,921 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 15:25:28,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:25:29,257 INFO L225 Difference]: With dead ends: 254560 [2023-12-02 15:25:29,257 INFO L226 Difference]: Without dead ends: 152909 [2023-12-02 15:25:29,348 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 15:25:29,349 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 15:25:29,349 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 15:25:29,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152909 states. [2023-12-02 15:25:42,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152909 to 147248. [2023-12-02 15:25:42,345 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 15:25:42,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147248 states to 147248 states and 180595 transitions. [2023-12-02 15:25:42,662 INFO L78 Accepts]: Start accepts. Automaton has 147248 states and 180595 transitions. Word has length 156 [2023-12-02 15:25:42,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:25:42,663 INFO L495 AbstractCegarLoop]: Abstraction has 147248 states and 180595 transitions. [2023-12-02 15:25:42,663 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 15:25:42,663 INFO L276 IsEmpty]: Start isEmpty. Operand 147248 states and 180595 transitions. [2023-12-02 15:25:42,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 15:25:42,760 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:25:42,760 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 15:25:42,768 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 15:25:42,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 15:25:42,961 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:25:42,962 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:25:42,962 INFO L85 PathProgramCache]: Analyzing trace with hash -407848661, now seen corresponding path program 1 times [2023-12-02 15:25:42,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:25:42,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113840767] [2023-12-02 15:25:42,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:25:42,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:25:42,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:25:43,089 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 15:25:43,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:25:43,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113840767] [2023-12-02 15:25:43,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [113840767] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:25:43,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77564086] [2023-12-02 15:25:43,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:25:43,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:25:43,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:25:43,091 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:25:43,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 15:25:43,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:25:43,271 INFO L262 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 15:25:43,274 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:25:43,448 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 15:25:43,448 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:25:43,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77564086] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:25:43,448 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:25:43,449 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 8 [2023-12-02 15:25:43,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442503803] [2023-12-02 15:25:43,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:25:43,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 15:25:43,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:25:43,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 15:25:43,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:25:43,451 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 15:25:56,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:25:56,958 INFO L93 Difference]: Finished difference Result 270300 states and 333964 transitions. [2023-12-02 15:25:56,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 15:25:56,959 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 15:25:56,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:25:57,364 INFO L225 Difference]: With dead ends: 270300 [2023-12-02 15:25:57,364 INFO L226 Difference]: Without dead ends: 158360 [2023-12-02 15:25:57,450 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 15:25:57,451 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 15:25:57,451 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 15:25:57,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158360 states. [2023-12-02 15:26:10,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158360 to 142403. [2023-12-02 15:26:10,890 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 15:26:11,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142403 states to 142403 states and 172672 transitions. [2023-12-02 15:26:11,267 INFO L78 Accepts]: Start accepts. Automaton has 142403 states and 172672 transitions. Word has length 156 [2023-12-02 15:26:11,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:26:11,267 INFO L495 AbstractCegarLoop]: Abstraction has 142403 states and 172672 transitions. [2023-12-02 15:26:11,268 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 15:26:11,268 INFO L276 IsEmpty]: Start isEmpty. Operand 142403 states and 172672 transitions. [2023-12-02 15:26:11,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 15:26:11,347 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:26:11,347 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 15:26:11,353 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2023-12-02 15:26:11,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:26:11,547 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:26:11,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:26:11,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1557836608, now seen corresponding path program 1 times [2023-12-02 15:26:11,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:26:11,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12353893] [2023-12-02 15:26:11,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:26:11,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:26:11,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:26:11,776 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 15:26:11,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:26:11,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12353893] [2023-12-02 15:26:11,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12353893] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:26:11,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870797170] [2023-12-02 15:26:11,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:26:11,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:26:11,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:26:11,778 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:26:11,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bc2c7676-9f60-4703-9505-f848afe2b668/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 15:26:11,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:26:11,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 871 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 15:26:11,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:26:11,953 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 15:26:11,953 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 15:26:11,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870797170] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:26:11,954 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 15:26:11,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-12-02 15:26:11,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40818858] [2023-12-02 15:26:11,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:26:11,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 15:26:11,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:26:11,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 15:26:11,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-12-02 15:26:11,955 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)