./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire --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 403fd15020889f127d837ab127be00e68706cbd07d6d3bacf6b25555a5c09975 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:28:22,362 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:28:22,478 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:28:22,482 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:28:22,483 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:28:22,507 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:28:22,508 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:28:22,508 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:28:22,509 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:28:22,510 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:28:22,511 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:28:22,511 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:28:22,512 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:28:22,512 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:28:22,513 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:28:22,513 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:28:22,514 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:28:22,514 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:28:22,515 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:28:22,515 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:28:22,516 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:28:22,517 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:28:22,517 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:28:22,518 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:28:22,518 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:28:22,519 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:28:22,519 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:28:22,519 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:28:22,520 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:28:22,520 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:28:22,521 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:28:22,521 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:28:22,521 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:28:22,522 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:28:22,522 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:28:22,522 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:28:22,523 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:28:22,523 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:28:22,523 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:28:22,523 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:28:22,523 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:28:22,524 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:28:22,524 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:28:22,524 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:28:22,525 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:28:22,525 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:28:22,525 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:28:22,525 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 403fd15020889f127d837ab127be00e68706cbd07d6d3bacf6b25555a5c09975 [2023-11-23 21:28:22,792 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:28:22,815 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:28:22,818 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:28:22,819 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:28:22,820 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:28:22,821 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c [2023-11-23 21:28:26,599 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:28:27,581 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:28:27,583 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c [2023-11-23 21:28:27,656 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/data/d8c04defb/7701722b2d4c40cda41239e813926b06/FLAGb65a71388 [2023-11-23 21:28:27,679 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/data/d8c04defb/7701722b2d4c40cda41239e813926b06 [2023-11-23 21:28:27,688 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:28:27,690 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:28:27,694 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:28:27,694 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:28:27,701 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:28:27,705 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:28:27" (1/1) ... [2023-11-23 21:28:27,706 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d7389a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:27, skipping insertion in model container [2023-11-23 21:28:27,707 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:28:27" (1/1) ... [2023-11-23 21:28:28,072 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:28:30,346 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c[380593,380606] [2023-11-23 21:28:30,383 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c[383339,383352] [2023-11-23 21:28:30,801 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:28:30,815 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:28:32,066 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c[380593,380606] [2023-11-23 21:28:32,072 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_f0f2c757-f970-4c98-99f3-9c5752120ec6/sv-benchmarks/c/combinations/Problem05_label49+token_ring.13.cil-2.c[383339,383352] [2023-11-23 21:28:32,100 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:28:32,192 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:28:32,193 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32 WrapperNode [2023-11-23 21:28:32,193 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:28:32,194 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:28:32,195 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:28:32,195 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:28:32,203 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:32,300 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:32,865 INFO L138 Inliner]: procedures = 70, calls = 80, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 13288 [2023-11-23 21:28:32,865 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:28:32,866 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:28:32,866 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:28:32,866 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:28:32,876 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:32,876 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:32,952 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:32,953 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,212 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,304 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,324 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,346 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,413 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:28:33,415 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:28:33,415 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:28:33,415 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:28:33,416 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (1/1) ... [2023-11-23 21:28:33,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:28:33,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:33,507 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:28:33,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:28:33,571 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:28:33,571 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:28:33,571 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:28:33,571 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:28:33,572 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:28:33,572 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:28:33,572 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:28:33,572 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:28:33,572 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:28:33,573 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:28:33,573 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:28:33,573 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:28:33,573 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:28:33,574 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:28:33,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:28:33,574 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:28:33,757 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:28:33,759 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:28:43,710 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:28:46,938 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:28:46,940 INFO L309 CfgBuilder]: Removed 17 assume(true) statements. [2023-11-23 21:28:46,943 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:28:46 BoogieIcfgContainer [2023-11-23 21:28:46,943 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:28:46,947 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:28:46,948 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:28:46,952 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:28:46,952 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:28:27" (1/3) ... [2023-11-23 21:28:46,953 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706b0100 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:28:46, skipping insertion in model container [2023-11-23 21:28:46,953 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:28:32" (2/3) ... [2023-11-23 21:28:46,955 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706b0100 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:28:46, skipping insertion in model container [2023-11-23 21:28:46,955 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:28:46" (3/3) ... [2023-11-23 21:28:46,957 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.13.cil-2.c [2023-11-23 21:28:46,979 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:28:46,979 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:28:47,078 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:28:47,087 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;@4e3a349a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:28:47,087 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:28:47,100 INFO L276 IsEmpty]: Start isEmpty. Operand has 1856 states, 1820 states have (on average 1.9467032967032967) internal successors, (3543), 1823 states have internal predecessors, (3543), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2023-11-23 21:28:47,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-11-23 21:28:47,115 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:47,115 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:47,116 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:47,122 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:47,122 INFO L85 PathProgramCache]: Analyzing trace with hash -963480218, now seen corresponding path program 1 times [2023-11-23 21:28:47,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:47,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148649654] [2023-11-23 21:28:47,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:47,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:47,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:47,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:28:47,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:47,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148649654] [2023-11-23 21:28:47,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148649654] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:47,799 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:28:47,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:28:47,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940024755] [2023-11-23 21:28:47,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:47,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:28:47,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:47,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:28:47,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:28:47,859 INFO L87 Difference]: Start difference. First operand has 1856 states, 1820 states have (on average 1.9467032967032967) internal successors, (3543), 1823 states have internal predecessors, (3543), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:28:49,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:49,158 INFO L93 Difference]: Finished difference Result 3908 states and 7525 transitions. [2023-11-23 21:28:49,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:28:49,178 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 70 [2023-11-23 21:28:49,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:49,203 INFO L225 Difference]: With dead ends: 3908 [2023-11-23 21:28:49,204 INFO L226 Difference]: Without dead ends: 2051 [2023-11-23 21:28:49,212 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 [2023-11-23 21:28:49,216 INFO L413 NwaCegarLoop]: 3569 mSDtfsCounter, 3840 mSDsluCounter, 3467 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3840 SdHoareTripleChecker+Valid, 7036 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:49,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3840 Valid, 7036 Invalid, 756 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:28:49,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2051 states. [2023-11-23 21:28:49,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2051 to 2050. [2023-11-23 21:28:49,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2050 states, 1986 states have (on average 1.903323262839879) internal successors, (3780), 1989 states have internal predecessors, (3780), 50 states have call successors, (50), 12 states have call predecessors, (50), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-23 21:28:49,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2050 states to 2050 states and 3880 transitions. [2023-11-23 21:28:49,416 INFO L78 Accepts]: Start accepts. Automaton has 2050 states and 3880 transitions. Word has length 70 [2023-11-23 21:28:49,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:49,417 INFO L495 AbstractCegarLoop]: Abstraction has 2050 states and 3880 transitions. [2023-11-23 21:28:49,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:28:49,418 INFO L276 IsEmpty]: Start isEmpty. Operand 2050 states and 3880 transitions. [2023-11-23 21:28:49,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:49,433 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:49,434 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:49,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:28:49,435 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:49,435 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:49,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1991246740, now seen corresponding path program 1 times [2023-11-23 21:28:49,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:49,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553404071] [2023-11-23 21:28:49,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:49,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:49,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:49,827 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:28:49,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:49,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553404071] [2023-11-23 21:28:49,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553404071] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:28:49,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342876967] [2023-11-23 21:28:49,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:49,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:49,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:49,843 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:28:49,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:28:50,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:50,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 1107 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:28:50,167 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:28:50,314 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:28:50,314 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:28:50,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342876967] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:50,315 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:28:50,315 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:28:50,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276341170] [2023-11-23 21:28:50,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:50,325 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:28:50,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:50,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:28:50,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:50,327 INFO L87 Difference]: Start difference. First operand 2050 states and 3880 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:51,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:51,024 INFO L93 Difference]: Finished difference Result 2851 states and 5109 transitions. [2023-11-23 21:28:51,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:28:51,025 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:28:51,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:51,046 INFO L225 Difference]: With dead ends: 2851 [2023-11-23 21:28:51,047 INFO L226 Difference]: Without dead ends: 2447 [2023-11-23 21:28:51,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:51,052 INFO L413 NwaCegarLoop]: 3373 mSDtfsCounter, 3539 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3539 SdHoareTripleChecker+Valid, 3627 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:51,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3539 Valid, 3627 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:28:51,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2447 states. [2023-11-23 21:28:51,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2447 to 2443. [2023-11-23 21:28:51,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2443 states, 2323 states have (on average 1.8411536805854498) internal successors, (4277), 2327 states have internal predecessors, (4277), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2023-11-23 21:28:51,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2443 states to 2443 states and 4465 transitions. [2023-11-23 21:28:51,181 INFO L78 Accepts]: Start accepts. Automaton has 2443 states and 4465 transitions. Word has length 144 [2023-11-23 21:28:51,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:51,182 INFO L495 AbstractCegarLoop]: Abstraction has 2443 states and 4465 transitions. [2023-11-23 21:28:51,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:51,183 INFO L276 IsEmpty]: Start isEmpty. Operand 2443 states and 4465 transitions. [2023-11-23 21:28:51,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:51,189 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:51,190 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:51,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:28:51,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:51,414 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:51,415 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:51,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1317038250, now seen corresponding path program 1 times [2023-11-23 21:28:51,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:51,416 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834477901] [2023-11-23 21:28:51,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:51,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:51,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:51,777 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:28:51,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:51,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834477901] [2023-11-23 21:28:51,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834477901] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:28:51,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916650423] [2023-11-23 21:28:51,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:51,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:51,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:51,791 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:28:51,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:28:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:52,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:28:52,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:28:52,152 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-23 21:28:52,152 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:28:52,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916650423] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:52,152 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:28:52,153 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:28:52,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469381439] [2023-11-23 21:28:52,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:52,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:28:52,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:52,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:28:52,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:52,156 INFO L87 Difference]: Start difference. First operand 2443 states and 4465 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:52,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:52,832 INFO L93 Difference]: Finished difference Result 4024 states and 6884 transitions. [2023-11-23 21:28:52,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:28:52,833 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:28:52,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:52,857 INFO L225 Difference]: With dead ends: 4024 [2023-11-23 21:28:52,857 INFO L226 Difference]: Without dead ends: 3227 [2023-11-23 21:28:52,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:52,868 INFO L413 NwaCegarLoop]: 3353 mSDtfsCounter, 3557 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3557 SdHoareTripleChecker+Valid, 3607 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:52,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3557 Valid, 3607 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:28:52,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3227 states. [2023-11-23 21:28:53,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3227 to 3221. [2023-11-23 21:28:53,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3221 states, 2991 states have (on average 1.7582748244734203) internal successors, (5259), 2997 states have internal predecessors, (5259), 180 states have call successors, (180), 48 states have call predecessors, (180), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2023-11-23 21:28:53,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3221 states to 3221 states and 5619 transitions. [2023-11-23 21:28:53,055 INFO L78 Accepts]: Start accepts. Automaton has 3221 states and 5619 transitions. Word has length 144 [2023-11-23 21:28:53,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:53,057 INFO L495 AbstractCegarLoop]: Abstraction has 3221 states and 5619 transitions. [2023-11-23 21:28:53,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:53,057 INFO L276 IsEmpty]: Start isEmpty. Operand 3221 states and 5619 transitions. [2023-11-23 21:28:53,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:53,067 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:53,068 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:53,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:28:53,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:53,290 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:53,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:53,290 INFO L85 PathProgramCache]: Analyzing trace with hash -667844248, now seen corresponding path program 1 times [2023-11-23 21:28:53,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:53,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328920020] [2023-11-23 21:28:53,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:53,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:53,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:28:53,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:53,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328920020] [2023-11-23 21:28:53,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328920020] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:28:53,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311416744] [2023-11-23 21:28:53,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:53,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:53,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:53,572 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:28:53,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:28:53,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:53,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 1095 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:28:53,883 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:28:53,952 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:28:53,952 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:28:53,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311416744] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:53,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:28:53,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:28:53,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811110259] [2023-11-23 21:28:53,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:53,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:28:53,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:53,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:28:53,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:53,955 INFO L87 Difference]: Start difference. First operand 3221 states and 5619 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:54,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:54,650 INFO L93 Difference]: Finished difference Result 6346 states and 10384 transitions. [2023-11-23 21:28:54,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:28:54,651 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:28:54,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:54,683 INFO L225 Difference]: With dead ends: 6346 [2023-11-23 21:28:54,684 INFO L226 Difference]: Without dead ends: 4771 [2023-11-23 21:28:54,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:54,694 INFO L413 NwaCegarLoop]: 3336 mSDtfsCounter, 3551 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3551 SdHoareTripleChecker+Valid, 3590 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:54,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3551 Valid, 3590 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:28:54,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4771 states. [2023-11-23 21:28:54,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4771 to 4761. [2023-11-23 21:28:54,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4761 states, 4315 states have (on average 1.6683661645422942) internal successors, (7199), 4325 states have internal predecessors, (7199), 348 states have call successors, (348), 96 states have call predecessors, (348), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2023-11-23 21:28:54,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4761 states to 4761 states and 7895 transitions. [2023-11-23 21:28:54,968 INFO L78 Accepts]: Start accepts. Automaton has 4761 states and 7895 transitions. Word has length 144 [2023-11-23 21:28:54,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:54,969 INFO L495 AbstractCegarLoop]: Abstraction has 4761 states and 7895 transitions. [2023-11-23 21:28:54,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:54,969 INFO L276 IsEmpty]: Start isEmpty. Operand 4761 states and 7895 transitions. [2023-11-23 21:28:54,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:54,982 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:54,982 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:55,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:28:55,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:55,206 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:55,206 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:55,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1608220838, now seen corresponding path program 1 times [2023-11-23 21:28:55,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:55,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728806798] [2023-11-23 21:28:55,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:55,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:55,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:55,513 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:28:55,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:55,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728806798] [2023-11-23 21:28:55,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728806798] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:28:55,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841798875] [2023-11-23 21:28:55,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:55,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:55,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:55,520 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:28:55,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:28:55,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:55,829 INFO L262 TraceCheckSpWp]: Trace formula consists of 1089 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:28:55,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:28:55,890 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-23 21:28:55,890 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:28:55,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841798875] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:55,892 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:28:55,893 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:28:55,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240919961] [2023-11-23 21:28:55,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:55,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:28:55,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:55,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:28:55,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:55,896 INFO L87 Difference]: Start difference. First operand 4761 states and 7895 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:56,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:56,869 INFO L93 Difference]: Finished difference Result 10942 states and 17284 transitions. [2023-11-23 21:28:56,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:28:56,870 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:28:56,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:56,931 INFO L225 Difference]: With dead ends: 10942 [2023-11-23 21:28:56,931 INFO L226 Difference]: Without dead ends: 7827 [2023-11-23 21:28:56,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:56,949 INFO L413 NwaCegarLoop]: 3367 mSDtfsCounter, 3560 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3560 SdHoareTripleChecker+Valid, 3621 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:56,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3560 Valid, 3621 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:28:56,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7827 states. [2023-11-23 21:28:57,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7827 to 7809. [2023-11-23 21:28:57,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7809 states, 6939 states have (on average 1.5897103329009943) internal successors, (11031), 6957 states have internal predecessors, (11031), 676 states have call successors, (676), 192 states have call predecessors, (676), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2023-11-23 21:28:57,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7809 states to 7809 states and 12383 transitions. [2023-11-23 21:28:57,321 INFO L78 Accepts]: Start accepts. Automaton has 7809 states and 12383 transitions. Word has length 144 [2023-11-23 21:28:57,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:57,321 INFO L495 AbstractCegarLoop]: Abstraction has 7809 states and 12383 transitions. [2023-11-23 21:28:57,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:57,323 INFO L276 IsEmpty]: Start isEmpty. Operand 7809 states and 12383 transitions. [2023-11-23 21:28:57,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:57,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:57,339 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:57,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:28:57,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:57,553 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:28:57,554 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:28:57,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1211513048, now seen corresponding path program 1 times [2023-11-23 21:28:57,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:28:57,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320719465] [2023-11-23 21:28:57,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:57,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:28:57,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:57,767 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:28:57,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:28:57,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320719465] [2023-11-23 21:28:57,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320719465] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:28:57,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087636798] [2023-11-23 21:28:57,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:28:57,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:28:57,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:28:57,770 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:28:57,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:28:58,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:28:58,047 INFO L262 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:28:58,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:28:58,123 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:28:58,123 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:28:58,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087636798] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:28:58,124 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:28:58,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:28:58,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314188572] [2023-11-23 21:28:58,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:28:58,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:28:58,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:28:58,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:28:58,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:58,126 INFO L87 Difference]: Start difference. First operand 7809 states and 12383 transitions. Second operand has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:58,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:28:58,923 INFO L93 Difference]: Finished difference Result 20038 states and 30884 transitions. [2023-11-23 21:28:58,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:28:58,924 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:28:58,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:28:59,019 INFO L225 Difference]: With dead ends: 20038 [2023-11-23 21:28:59,019 INFO L226 Difference]: Without dead ends: 13875 [2023-11-23 21:28:59,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:28:59,046 INFO L413 NwaCegarLoop]: 3318 mSDtfsCounter, 3530 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3530 SdHoareTripleChecker+Valid, 3572 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:28:59,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3530 Valid, 3572 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:28:59,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13875 states. [2023-11-23 21:28:59,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13875 to 13841. [2023-11-23 21:28:59,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13841 states, 12139 states have (on average 1.5321690419309664) internal successors, (18599), 12173 states have internal predecessors, (18599), 1316 states have call successors, (1316), 384 states have call predecessors, (1316), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2023-11-23 21:28:59,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13841 states to 13841 states and 21231 transitions. [2023-11-23 21:28:59,750 INFO L78 Accepts]: Start accepts. Automaton has 13841 states and 21231 transitions. Word has length 144 [2023-11-23 21:28:59,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:28:59,750 INFO L495 AbstractCegarLoop]: Abstraction has 13841 states and 21231 transitions. [2023-11-23 21:28:59,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:28:59,751 INFO L276 IsEmpty]: Start isEmpty. Operand 13841 states and 21231 transitions. [2023-11-23 21:28:59,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:28:59,785 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:28:59,785 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:28:59,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:00,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:29:00,007 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:00,008 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:00,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1947665110, now seen corresponding path program 1 times [2023-11-23 21:29:00,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:00,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564964575] [2023-11-23 21:29:00,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:00,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:00,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:00,260 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:00,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:00,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564964575] [2023-11-23 21:29:00,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564964575] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:00,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196194703] [2023-11-23 21:29:00,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:00,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:00,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:00,263 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:00,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:29:00,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:00,541 INFO L262 TraceCheckSpWp]: Trace formula consists of 1077 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:00,547 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:00,629 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:29:00,629 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:00,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196194703] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:00,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:00,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:00,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797431975] [2023-11-23 21:29:00,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:00,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:00,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:00,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:00,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:00,636 INFO L87 Difference]: Start difference. First operand 13841 states and 21231 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:01,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:01,930 INFO L93 Difference]: Finished difference Result 38038 states and 57684 transitions. [2023-11-23 21:29:01,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:01,931 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:29:01,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:02,034 INFO L225 Difference]: With dead ends: 38038 [2023-11-23 21:29:02,034 INFO L226 Difference]: Without dead ends: 25843 [2023-11-23 21:29:02,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:02,080 INFO L413 NwaCegarLoop]: 3318 mSDtfsCounter, 3533 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3572 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:02,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3533 Valid, 3572 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:29:02,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25843 states. [2023-11-23 21:29:03,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25843 to 25777. [2023-11-23 21:29:03,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25777 states, 22443 states have (on average 1.494586285255982) internal successors, (33543), 22509 states have internal predecessors, (33543), 2564 states have call successors, (2564), 768 states have call predecessors, (2564), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2023-11-23 21:29:03,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25777 states to 25777 states and 38671 transitions. [2023-11-23 21:29:03,181 INFO L78 Accepts]: Start accepts. Automaton has 25777 states and 38671 transitions. Word has length 144 [2023-11-23 21:29:03,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:03,182 INFO L495 AbstractCegarLoop]: Abstraction has 25777 states and 38671 transitions. [2023-11-23 21:29:03,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 2 states have internal predecessors, (114), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:03,183 INFO L276 IsEmpty]: Start isEmpty. Operand 25777 states and 38671 transitions. [2023-11-23 21:29:03,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-23 21:29:03,232 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:03,232 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:03,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:03,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:29:03,445 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:29:03,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:03,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1744236520, now seen corresponding path program 1 times [2023-11-23 21:29:03,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:03,446 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579890439] [2023-11-23 21:29:03,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:03,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:03,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:03,657 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:29:03,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:03,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579890439] [2023-11-23 21:29:03,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579890439] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:03,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057318195] [2023-11-23 21:29:03,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:03,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:03,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:03,660 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:03,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0f2c757-f970-4c98-99f3-9c5752120ec6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:29:03,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:03,936 INFO L262 TraceCheckSpWp]: Trace formula consists of 1071 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:29:03,940 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:03,994 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-23 21:29:03,995 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:29:03,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057318195] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:03,995 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:29:03,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:29:03,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440937728] [2023-11-23 21:29:03,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:03,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:03,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:03,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:03,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:03,997 INFO L87 Difference]: Start difference. First operand 25777 states and 38671 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:29:06,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:06,105 INFO L93 Difference]: Finished difference Result 73654 states and 110484 transitions. [2023-11-23 21:29:06,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:06,106 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2023-11-23 21:29:06,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:06,369 INFO L225 Difference]: With dead ends: 73654 [2023-11-23 21:29:06,370 INFO L226 Difference]: Without dead ends: 49523 [2023-11-23 21:29:06,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:06,447 INFO L413 NwaCegarLoop]: 3318 mSDtfsCounter, 3545 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3545 SdHoareTripleChecker+Valid, 3572 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:06,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3545 Valid, 3572 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time]