./Ultimate.py --spec ../../../trunk/examples/svcomp/properties/unreach-call.prp --file ../../../trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a340643f Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../../../trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9010a499ef96f31ef98b99a567d66bd11342d64ef955a852686bd9085f4ce268 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-a340643-m [2024-01-27 15:31:12,290 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-01-27 15:31:12,383 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-01-27 15:31:12,391 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-01-27 15:31:12,391 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-01-27 15:31:12,423 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-01-27 15:31:12,424 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-01-27 15:31:12,424 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-01-27 15:31:12,425 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-01-27 15:31:12,428 INFO L153 SettingsManager]: * Use memory slicer=true [2024-01-27 15:31:12,428 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-01-27 15:31:12,429 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-01-27 15:31:12,430 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-01-27 15:31:12,431 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-01-27 15:31:12,431 INFO L153 SettingsManager]: * Use SBE=true [2024-01-27 15:31:12,431 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-01-27 15:31:12,432 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-01-27 15:31:12,432 INFO L153 SettingsManager]: * sizeof long=4 [2024-01-27 15:31:12,432 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-01-27 15:31:12,432 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-01-27 15:31:12,433 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-01-27 15:31:12,433 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-01-27 15:31:12,433 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-01-27 15:31:12,434 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-01-27 15:31:12,434 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-01-27 15:31:12,434 INFO L153 SettingsManager]: * sizeof long double=12 [2024-01-27 15:31:12,434 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-01-27 15:31:12,435 INFO L153 SettingsManager]: * Use constant arrays=true [2024-01-27 15:31:12,435 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-01-27 15:31:12,436 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-01-27 15:31:12,436 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-01-27 15:31:12,437 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-01-27 15:31:12,437 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-01-27 15:31:12,437 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-01-27 15:31:12,437 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-01-27 15:31:12,438 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-01-27 15:31:12,438 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-01-27 15:31:12,438 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-01-27 15:31:12,438 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-01-27 15:31:12,438 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-01-27 15:31:12,439 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2024-01-27 15:31:12,439 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-01-27 15:31:12,439 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-01-27 15:31:12,439 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9010a499ef96f31ef98b99a567d66bd11342d64ef955a852686bd9085f4ce268 [2024-01-27 15:31:12,680 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-01-27 15:31:12,705 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-01-27 15:31:12,707 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-01-27 15:31:12,708 INFO L270 PluginConnector]: Initializing CDTParser... [2024-01-27 15:31:12,709 INFO L274 PluginConnector]: CDTParser initialized [2024-01-27 15:31:12,710 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c [2024-01-27 15:31:13,871 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-01-27 15:31:14,043 INFO L384 CDTParser]: Found 1 translation units. [2024-01-27 15:31:14,044 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c [2024-01-27 15:31:14,056 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6da59080/572d021327d6436998ee2e9d7384fd89/FLAGd9e7e360e [2024-01-27 15:31:14,070 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c6da59080/572d021327d6436998ee2e9d7384fd89 [2024-01-27 15:31:14,073 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-01-27 15:31:14,074 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-01-27 15:31:14,077 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-01-27 15:31:14,078 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-01-27 15:31:14,083 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-01-27 15:31:14,084 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,084 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74e1d9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14, skipping insertion in model container [2024-01-27 15:31:14,085 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,106 INFO L177 MainTranslator]: Built tables and reachable declarations [2024-01-27 15:31:14,245 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c[2278,2291] [2024-01-27 15:31:14,250 INFO L209 PostProcessor]: Analyzing one entry point: main [2024-01-27 15:31:14,257 INFO L202 MainTranslator]: Completed pre-run [2024-01-27 15:31:14,273 WARN L239 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/weaver/parallel-misc-2-unrolled-atomic.wvr.c[2278,2291] [2024-01-27 15:31:14,274 INFO L209 PostProcessor]: Analyzing one entry point: main [2024-01-27 15:31:14,287 INFO L206 MainTranslator]: Completed translation [2024-01-27 15:31:14,287 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14 WrapperNode [2024-01-27 15:31:14,288 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-01-27 15:31:14,289 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-01-27 15:31:14,289 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-01-27 15:31:14,289 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-01-27 15:31:14,295 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,301 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,318 INFO L138 Inliner]: procedures = 20, calls = 25, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 71 [2024-01-27 15:31:14,318 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-01-27 15:31:14,319 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-01-27 15:31:14,319 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-01-27 15:31:14,319 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-01-27 15:31:14,328 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,328 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,333 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,346 INFO L175 MemorySlicer]: Split 6 memory accesses to 3 slices as follows [2, 2, 2]. 33 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0]. The 2 writes are split as follows [0, 1, 1]. [2024-01-27 15:31:14,346 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,346 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,351 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,354 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,355 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,356 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,358 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-01-27 15:31:14,359 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-01-27 15:31:14,359 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-01-27 15:31:14,360 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-01-27 15:31:14,360 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (1/1) ... [2024-01-27 15:31:14,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-01-27 15:31:14,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-01-27 15:31:14,391 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-01-27 15:31:14,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-01-27 15:31:14,447 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-01-27 15:31:14,448 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2024-01-27 15:31:14,448 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2024-01-27 15:31:14,448 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2024-01-27 15:31:14,448 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2024-01-27 15:31:14,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-01-27 15:31:14,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-01-27 15:31:14,450 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-01-27 15:31:14,450 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2024-01-27 15:31:14,451 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-01-27 15:31:14,452 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-01-27 15:31:14,452 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-01-27 15:31:14,452 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-01-27 15:31:14,452 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-01-27 15:31:14,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-01-27 15:31:14,455 WARN L214 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2024-01-27 15:31:14,539 INFO L244 CfgBuilder]: Building ICFG [2024-01-27 15:31:14,541 INFO L270 CfgBuilder]: Building CFG for each procedure with an implementation [2024-01-27 15:31:14,796 INFO L289 CfgBuilder]: Ommited future-live optimization because the input is a concurrent program. [2024-01-27 15:31:14,797 INFO L293 CfgBuilder]: Performing block encoding [2024-01-27 15:31:14,961 INFO L315 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-01-27 15:31:14,961 INFO L320 CfgBuilder]: Removed 2 assume(true) statements. [2024-01-27 15:31:14,962 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.01 03:31:14 BoogieIcfgContainer [2024-01-27 15:31:14,962 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-01-27 15:31:14,963 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-01-27 15:31:14,964 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-01-27 15:31:14,970 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-01-27 15:31:14,971 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.01 03:31:14" (1/3) ... [2024-01-27 15:31:14,971 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5001dac1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.01 03:31:14, skipping insertion in model container [2024-01-27 15:31:14,972 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.01 03:31:14" (2/3) ... [2024-01-27 15:31:14,973 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5001dac1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.01 03:31:14, skipping insertion in model container [2024-01-27 15:31:14,973 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.01 03:31:14" (3/3) ... [2024-01-27 15:31:14,974 INFO L112 eAbstractionObserver]: Analyzing ICFG parallel-misc-2-unrolled-atomic.wvr.c [2024-01-27 15:31:14,983 WARN L146 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2024-01-27 15:31:14,992 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-01-27 15:31:14,992 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-01-27 15:31:14,993 INFO L518 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2024-01-27 15:31:15,038 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2024-01-27 15:31:15,077 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 26 places, 21 transitions, 56 flow [2024-01-27 15:31:15,105 INFO L124 PetriNetUnfolderBase]: 2/19 cut-off events. [2024-01-27 15:31:15,116 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2024-01-27 15:31:15,119 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28 conditions, 19 events. 2/19 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 14 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 13. Up to 2 conditions per place. [2024-01-27 15:31:15,119 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 21 transitions, 56 flow [2024-01-27 15:31:15,122 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 23 places, 18 transitions, 48 flow [2024-01-27 15:31:15,131 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-01-27 15:31:15,137 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=PETRI_NET, 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;@1ad23e63, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-01-27 15:31:15,137 INFO L358 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2024-01-27 15:31:15,152 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2024-01-27 15:31:15,152 INFO L124 PetriNetUnfolderBase]: 2/17 cut-off events. [2024-01-27 15:31:15,152 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2024-01-27 15:31:15,152 INFO L200 CegarLoopForPetriNet]: Found error trace [2024-01-27 15:31:15,153 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-01-27 15:31:15,154 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES, ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2024-01-27 15:31:15,159 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-01-27 15:31:15,159 INFO L85 PathProgramCache]: Analyzing trace with hash -139983153, now seen corresponding path program 1 times [2024-01-27 15:31:15,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-01-27 15:31:15,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182015069] [2024-01-27 15:31:15,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-01-27 15:31:15,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-01-27 15:31:15,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-01-27 15:31:15,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-01-27 15:31:15,510 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-01-27 15:31:15,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182015069] [2024-01-27 15:31:15,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182015069] provided 1 perfect and 0 imperfect interpolant sequences [2024-01-27 15:31:15,511 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-01-27 15:31:15,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-01-27 15:31:15,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560258484] [2024-01-27 15:31:15,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-01-27 15:31:15,521 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-01-27 15:31:15,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-01-27 15:31:15,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-01-27 15:31:15,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-01-27 15:31:15,554 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 7 out of 21 [2024-01-27 15:31:15,555 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 18 transitions, 48 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-01-27 15:31:15,556 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2024-01-27 15:31:15,556 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 7 of 21 [2024-01-27 15:31:15,556 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2024-01-27 15:31:15,618 INFO L124 PetriNetUnfolderBase]: 44/84 cut-off events. [2024-01-27 15:31:15,618 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2024-01-27 15:31:15,620 INFO L83 FinitePrefix]: Finished finitePrefix Result has 172 conditions, 84 events. 44/84 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 245 event pairs, 18 based on Foata normal form. 1/77 useless extension candidates. Maximal degree in co-relation 128. Up to 72 conditions per place. [2024-01-27 15:31:15,623 INFO L140 encePairwiseOnDemand]: 19/21 looper letters, 0 selfloop transitions, 0 changer transitions 16/16 dead transitions. [2024-01-27 15:31:15,623 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 16 transitions, 68 flow [2024-01-27 15:31:15,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-01-27 15:31:15,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2024-01-27 15:31:15,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 34 transitions. [2024-01-27 15:31:15,634 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5396825396825397 [2024-01-27 15:31:15,636 INFO L175 Difference]: Start difference. First operand has 23 places, 18 transitions, 48 flow. Second operand 3 states and 34 transitions. [2024-01-27 15:31:15,637 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 16 transitions, 68 flow [2024-01-27 15:31:15,639 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 16 transitions, 60 flow, removed 0 selfloop flow, removed 4 redundant places. [2024-01-27 15:31:15,640 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2024-01-27 15:31:15,642 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=21, PETRI_DIFFERENCE_MINUEND_FLOW=36, PETRI_DIFFERENCE_MINUEND_PLACES=17, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2024-01-27 15:31:15,648 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, -4 predicate places. [2024-01-27 15:31:15,648 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2024-01-27 15:31:15,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-01-27 15:31:15,651 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (2 of 3 remaining) [2024-01-27 15:31:15,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (1 of 3 remaining) [2024-01-27 15:31:15,652 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 3 remaining) [2024-01-27 15:31:15,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-01-27 15:31:15,653 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2024-01-27 15:31:15,660 INFO L229 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2024-01-27 15:31:15,660 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2024-01-27 15:31:15,668 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.01 03:31:15 BasicIcfg [2024-01-27 15:31:15,669 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2024-01-27 15:31:15,671 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2024-01-27 15:31:15,671 INFO L270 PluginConnector]: Initializing Witness Printer... [2024-01-27 15:31:15,672 INFO L274 PluginConnector]: Witness Printer initialized [2024-01-27 15:31:15,672 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.01 03:31:14" (3/4) ... [2024-01-27 15:31:15,679 INFO L137 WitnessPrinter]: Generating witness for correct program [2024-01-27 15:31:15,682 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure thread1 [2024-01-27 15:31:15,683 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure thread2 [2024-01-27 15:31:15,687 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 66 nodes and edges [2024-01-27 15:31:15,687 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 18 nodes and edges [2024-01-27 15:31:15,688 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2024-01-27 15:31:15,688 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2024-01-27 15:31:15,760 INFO L149 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2024-01-27 15:31:15,761 INFO L149 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.yml [2024-01-27 15:31:15,761 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2024-01-27 15:31:15,763 INFO L158 Benchmark]: Toolchain (without parser) took 1687.29ms. Allocated memory is still 138.4MB. Free memory was 85.7MB in the beginning and 44.9MB in the end (delta: 40.7MB). Peak memory consumption was 41.6MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,763 INFO L158 Benchmark]: CDTParser took 0.17ms. Allocated memory is still 138.4MB. Free memory is still 99.5MB. There was no memory consumed. Max. memory is 16.1GB. [2024-01-27 15:31:15,763 INFO L158 Benchmark]: CACSL2BoogieTranslator took 210.53ms. Allocated memory is still 138.4MB. Free memory was 85.3MB in the beginning and 73.9MB in the end (delta: 11.4MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,765 INFO L158 Benchmark]: Boogie Procedure Inliner took 29.91ms. Allocated memory is still 138.4MB. Free memory was 73.9MB in the beginning and 72.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,765 INFO L158 Benchmark]: Boogie Preprocessor took 39.61ms. Allocated memory is still 138.4MB. Free memory was 72.3MB in the beginning and 70.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,766 INFO L158 Benchmark]: RCFGBuilder took 602.61ms. Allocated memory is still 138.4MB. Free memory was 69.9MB in the beginning and 88.3MB in the end (delta: -18.5MB). Peak memory consumption was 16.5MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,766 INFO L158 Benchmark]: TraceAbstraction took 705.38ms. Allocated memory is still 138.4MB. Free memory was 87.6MB in the beginning and 49.9MB in the end (delta: 37.8MB). Peak memory consumption was 37.7MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,767 INFO L158 Benchmark]: Witness Printer took 90.15ms. Allocated memory is still 138.4MB. Free memory was 49.9MB in the beginning and 44.9MB in the end (delta: 5.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2024-01-27 15:31:15,769 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17ms. Allocated memory is still 138.4MB. Free memory is still 99.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 210.53ms. Allocated memory is still 138.4MB. Free memory was 85.3MB in the beginning and 73.9MB in the end (delta: 11.4MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 29.91ms. Allocated memory is still 138.4MB. Free memory was 73.9MB in the beginning and 72.3MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 39.61ms. Allocated memory is still 138.4MB. Free memory was 72.3MB in the beginning and 70.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 602.61ms. Allocated memory is still 138.4MB. Free memory was 69.9MB in the beginning and 88.3MB in the end (delta: -18.5MB). Peak memory consumption was 16.5MB. Max. memory is 16.1GB. * TraceAbstraction took 705.38ms. Allocated memory is still 138.4MB. Free memory was 87.6MB in the beginning and 49.9MB in the end (delta: 37.8MB). Peak memory consumption was 37.7MB. Max. memory is 16.1GB. * Witness Printer took 90.15ms. Allocated memory is still 138.4MB. Free memory was 49.9MB in the beginning and 44.9MB in the end (delta: 5.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 84]: a call to reach_error is unreachable For all program executions holds that a call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data with 1 thread instances CFG has 5 procedures, 30 locations, 3 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 0.0s, RemoveRedundantFlowTime: 0.0s, RemoveRedundantFlowUnfoldingTime: 0.0s, BackfoldingTime: 0.0s, BackfoldingUnfoldingTime: 0.0s, FlowIncreaseByBackfolding: 0, BasicCegarLoop: OverallTime: 0.6s, OverallIterations: 1, TraceHistogramMax: 1, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.1s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 0 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 0 mSDsluCounter, 0 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 0 mSDsCounter, 2 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 12 IncrementalHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2 mSolverCounterUnsat, 0 mSDtfsCounter, 12 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=0, InterpolantAutomatonStates: 3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 14 NumberOfCodeBlocks, 14 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 13 ConstructedInterpolants, 0 QuantifiedInterpolants, 37 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2024-01-27 15:31:15,788 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE