Found one Java-level deadlock:
=============================
"MSC service thread 11-8":
waiting to lock monitor 0xa221b37c (object 0xe561fa38, a org.jboss.msc.service.ServiceControllerImpl),
which is held by "Controller Boot Thread"
"Controller Boot Thread":
waiting to lock monitor 0xa20b3f64 (object 0xe5718bf0, a org.jboss.msc.service.ServiceRegistrationImpl),
which is held by "main"
"main":
waiting to lock monitor 0xa221b37c (object 0xe561fa38, a org.jboss.msc.service.ServiceControllerImpl),
which is held by "Controller Boot Thread"

Java stack information for the threads listed above:
===================================================
"MSC service thread 11-8":
at org.jboss.msc.service.ServiceControllerImpl.dependencyAvailable(ServiceControllerImpl.java:850)

• waiting to lock <0xe561fa38> (a org.jboss.msc.service.ServiceControllerImpl)
  at org.jboss.msc.service.ServiceControllerImpl$DependencyAvailableTask.inform(ServiceControllerImpl.java:1665)
  at org.jboss.msc.service.ServiceControllerImpl$DependentsControllerTask.execute(ServiceControllerImpl.java:1612)
  at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1556)
  at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
  at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
  at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
  at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
  at java.lang.Thread.run(Thread.java:748)
  "Controller Boot Thread":
  at org.jboss.msc.service.ServiceControllerImpl.getImmediateUnavailableDependencies(ServiceControllerImpl.java:1287)
• waiting to lock <0xe5718bf0> (a org.jboss.msc.service.ServiceRegistrationImpl)
• locked <0xe561fa38> (a org.jboss.msc.service.ServiceControllerImpl)
  at org.jboss.msc.service.ServiceControllerImpl.getUnavailableDependencies(ServiceControllerImpl.java:1279)
  at org.jboss.as.controller.ServiceVerificationHelper.execute(ServiceVerificationHelper.java:93)
• locked <0xe575c008> (a org.jboss.as.controller.ServiceVerificationHelper)
  at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:999)
  at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:743)
  at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:467)
  at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1411)
  at org.jboss.as.controller.ModelControllerImpl.boot(ModelControllerImpl.java:495)
  at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:470)
  at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:432)
  at org.jboss.as.model.test.ModelTestModelControllerService.boot(ModelTestModelControllerService.java:276)
  at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:419)
  at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:372)
  at java.lang.Thread.run(Thread.java:748)
  "main":
  at org.jboss.msc.service.ServiceControllerImpl.getState(ServiceControllerImpl.java:1101)
• waiting to lock <0xe561fa38> (a org.jboss.msc.service.ServiceControllerImpl)
  at org.jboss.msc.service.ServiceContainerImpl.detectCircularity(ServiceContainerImpl.java:806)
  at org.jboss.msc.service.ServiceContainerImpl.detectCircularity(ServiceContainerImpl.java:784)
• locked <0xe5718bf0> (a org.jboss.msc.service.ServiceRegistrationImpl)
  at org.jboss.msc.service.ServiceContainerImpl.install(ServiceContainerImpl.java:761)
  at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:260)
  at org.jboss.msc.service.ObsoleteServiceBuilderImpl.install(ObsoleteServiceBuilderImpl.java:293)
  at org.wildfly.extension.undertow.AbstractUndertowSubsystemTestCase$RuntimeInitialization.addExtraServices(AbstractUndertowSubsystemTestCase.java:240)
  at org.jboss.as.subsystem.test.AbstractKernelServicesImpl.create(AbstractKernelServicesImpl.java:127)
  at org.jboss.as.subsystem.test.SubsystemTestDelegate$KernelServicesBuilderImpl.build(SubsystemTestDelegate.java:568)
  at org.wildfly.extension.undertow.UndertowSubsystem11TestCase.testRuntime(UndertowSubsystem11TestCase.java:72)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at