shutdown.sar fails to stop server

Today the AS testsuite runs on hudson are starting to fail intermittently[1] due to the jboss-minimal-tests target's shutdown.sar not stopping the AS. There seems to be a classloading problem when ExitOnShutdown's anonymous Runnable tries to execute.[2]

I looked at a successful run going back a month and the WARN in the logging below was there, so that's not new.

[1] https://hudson.jboss.org/hudson/job/JBoss-AS-6.0.x-testSuite-sun16/537/

https://hudson.jboss.org/hudson/job/JBoss-AS-6.0.x-testSuite-sun16/539/

[2]

2010-02-02 04:58:17,623 DEBUG [org.jboss.test.jmx.shutdown.ExitOnShutdown] (HDScanner) Stopping jboss.test:name=ExitOnShutdown
2010-02-02 04:58:17,624 WARN [org.jboss.virtual.plugins.context.AbstractVirtualFileHandler] (HDScanner) No such existing handler, falling back to old root + path: vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/org/jboss/test/jmx/shutdown/ExitOnShutdown$1.class
2010-02-02 04:58:17,636 DEBUG [org.jboss.test.jmx.shutdown.ExitOnShutdown] (HDScanner) Stopped jboss.test:name=ExitOnShutdown
2010-02-02 04:58:17,636 DEBUG [org.jboss.system.ServiceController] (HDScanner) destroying service: jboss.test:name=ExitOnShutdown
2010-02-02 04:58:17,637 DEBUG [org.jboss.system.ServiceController] (HDScanner) removing service: jboss.test:name=ExitOnShutdown
2010-02-02 04:58:17,637 DEBUG [org.jboss.system.ServiceCreator] (HDScanner) Removing mbean from server: jboss.test:name=ExitOnShutdown
2010-02-02 04:58:17,642 DEBUG [org.jboss.deployers.structure.spi.helpers.AbstractDeploymentContext] (HDScanner) Removed component jboss.test:name=ExitOnShutdown from vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/
2010-02-02 04:58:17,647 DEBUG [org.jboss.aop.asintegration.jboss5.RegisterModuleCallback] (HDScanner) Removing module VFSDeploymentClassLoaderPolicyModule shutdown.sar:0.0.0
2010-02-02 04:58:17,647 DEBUG [org.jboss.classloader.spi.base.BaseClassLoaderDomain] (HDScanner) ClassLoaderDomain@1f8bd0d

{DefaultDomain} unregisterClassLoader BaseClassLoader@8c1852{vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/}
2010-02-02 04:58:17,648 DEBUG [org.jboss.mx.loading.UnifiedLoaderRepository3] (HDScanner) UnifiedLoaderRepository removed(false) null
2010-02-02 04:58:17,649 DEBUG [org.jboss.classloader.spi.base.BaseClassLoaderPolicy] (HDScanner) VFSClassLoaderPolicy@190ed52{vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/} shutdown!
2010-02-02 04:58:17,649 DEBUG [org.jboss.classloader.spi.base.BaseClassLoader] (HDScanner) BaseClassLoader@8c1852{vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/} shutdown!
2010-02-02 04:58:17,650 DEBUG [org.jboss.classloading.spi.dependency.Domain] (HDScanner) org.jboss.classloading.spi.dependency.Domain@3a6e5c{DefaultDomain}

remove module VFSDeploymentClassLoaderPolicyModule shutdown.sar:0.0.0
2010-02-02 04:58:17,650 DEBUG [org.jboss.deployers.vfs.plugins.classloader.InMemoryClassesDeployer] (HDScanner) Removing dynamic class root for vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/
2010-02-02 04:58:17,658 DEBUG [org.jboss.deployers.plugins.deployers.DeployersImpl] (HDScanner) Fully Undeployed vfszip:/mnt/hudson_workspace/workspace/JBoss-AS-6.0.x-testSuite-sun16/JBossAS/build/target/jboss-6.0.0-SNAPSHOT/server/minimal/deploy/shutdown.sar/
2010-02-02 04:58:17,674 ERROR [STDERR] (ExitOnShutdown) Exception in thread "ExitOnShutdown" java.lang.NoClassDefFoundError: java/lang/System
2010-02-02 04:58:17,675 ERROR [STDERR] (ExitOnShutdown) at org.jboss.test.jmx.shutdown.ExitOnShutdown$1.run(ExitOnShutdown.java:52)
2010-02-02 04:58:17,676 ERROR [STDERR] (ExitOnShutdown) at java.lang.Thread.run(Thread.java:619)
2010-02-02 04:58:17,676 ERROR [STDERR] (ExitOnShutdown) Caused by: java.lang.ClassNotFoundException: Class not found java.lang.System
2010-02-02 04:58:17,676 ERROR [STDERR] (ExitOnShutdown) at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:892)
2010-02-02 04:58:17,677 ERROR [STDERR] (ExitOnShutdown) at org.jboss.classloader.spi.base.BaseClassLoader.doLoadClass(BaseClassLoader.java:522)
2010-02-02 04:58:17,677 ERROR [STDERR] (ExitOnShutdown) at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:467)
2010-02-02 04:58:17,677 ERROR [STDERR] (ExitOnShutdown) at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
2010-02-02 04:58:17,678 ERROR [STDERR] (ExitOnShutdown) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
2010-02-02 04:58:17,678 ERROR [STDERR] (ExitOnShutdown) ... 2 more
2010-02-02 04:59:47,314 INFO [org.jboss.bootstrap.impl.base.server.AbstractServer] (Thread-5) Stopping: JBossAS [6.0.0.SNAPSHOT (build: SVNTag=JBoss_6.0.0-SNAPSHOT date=r100244)]
2010-02-02 04:59:47,314 DEBUG [org.jboss.bootstrap.impl.as.lifecycle.AbstractKernelEventLifecycleEventHandler] (Thread-5) Fired: AbstractEvent@a801b0

{source=org.jboss.kernel.plugins.event.AbstractEventManager@1fe0816 type=org.jboss.system.server.stopped seq=0 time=1265104787314 context=1265104787314}

2010-02-02 04:59:47,314 DEBUG [org.jboss.bootstrap.impl.base.server.AbstractServer] (Thread-5) Sent JMX Notification: org.jboss.system.server.stopped