[jboss-dev-forums] [Design of POJO Server] - Re: Strange classloading behavior -- thread stuck
bstansberry@jboss.com
do-not-reply at jboss.com
Mon Feb 2 14:23:47 EST 2009
First set of thread dumps. Following are two dumps showing the same thread. Following is some back and forth between us about when this happened:
"Bela Ban" wrote : "Brian Stansberry" wrote : A few questions:
| |
| | 1) Is this with a stock AS 5.0.0.GA and a standard install of mod_cluster? I think yes, but am double-checking?
|
| Yes
|
|
| "Brian Stansberry" wrote : 2) Is this reproducible?
|
| Yes. If you run https://jira.jboss.org/jira/browse/MODCLUSTER-31 (IIRC), you always have these long stack traces.
First stack trace for the problem thread:
| Name: Incoming-12,192.168.1.5:57544
| State: RUNNABLE
| Total blocked: 4 Total waited: 24,105
|
| Stack trace:
| java.util.Collections$SynchronizedList.remove(Collections.java:1825)
| - locked java.util.Collections$SynchronizedList at 45b84e09
| org.jboss.classloader.spi.base.ClassLoaderManager.unregisterLoaderThread(ClassLoaderManager.java:115)
| - locked java.util.Collections$SynchronizedList at 45b84e09
| org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:1011)
| - locked org.jboss.classloader.spi.base.BaseClassLoader at 7b17ad7b
| org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:894)
| org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:289)
| org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:148)
| org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:256)
| org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1099)
| org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:735)
| org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:378)
| - locked org.jboss.classloader.spi.base.BaseClassLoader at 3bbe9a50
| java.lang.ClassLoader.loadClass(ClassLoader.java:252)
| java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
| - locked org.jboss.classloader.spi.base.BaseClassLoader at 3bbe9a50
| java.lang.ClassLoader.defineClass1(Native Method)
| java.lang.ClassLoader.defineClass(ClassLoader.java:621)
| org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:62)
| org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:509)
| org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:469)
| java.security.AccessController.doPrivileged(Native Method)
| org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:467)
| - locked org.jboss.classloader.spi.base.BaseClassLoader at 3bbe9a50
| org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:444)
| org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:134)
| org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)
| org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:452)
| org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:254)
| org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:148)
| org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:256)
| org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1099)
| org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:735)
| org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:378)
| - locked org.jboss.classloader.spi.base.BaseClassLoader at 3bbe9a50
| java.lang.ClassLoader.loadClass(ClassLoader.java:252)
| org.jboss.invocation.MarshalledValueInputStream.resolveClass(MarshalledValueInputStream.java:101)
| java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
| java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
| java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
| java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
| java.util.HashSet.readObject(HashSet.java:291)
| sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source)
| sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| java.lang.reflect.Method.invoke(Method.java:597)
| java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
| java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
| java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
| java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
| java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
| java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
| java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
| org.jboss.ha.framework.server.ClusterPartition.objectFromByteBufferResponseInternal(ClusterPartition.java:1887)
| org.jboss.ha.framework.server.ClusterPartition$ResponseMarshallerImpl.objectFromByteBuffer(ClusterPartition.java:2084)
| org.jgroups.blocks.RpcDispatcher$MarshallerAdapter.objectFromByteBuffer(RpcDispatcher.java:138)
| org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:557)
| org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:368)
| org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:775)
| org.jgroups.JChannel.up(JChannel.java:1274)
| org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:462)
| org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:377)
| org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:144)
| org.jgroups.protocols.FRAG2.up(FRAG2.java:192)
| org.jgroups.protocols.FC.up(FC.java:468)
| org.jgroups.protocols.pbcast.GMS.up(GMS.java:796)
| org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:233)
| org.jgroups.protocols.UNICAST.handleDataReceived(UNICAST.java:616)
| org.jgroups.protocols.UNICAST.up(UNICAST.java:282)
| org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:747)
| org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:167)
| org.jgroups.protocols.FD.up(FD.java:284)
| org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:308)
| org.jgroups.protocols.MERGE2.up(MERGE2.java:144)
| org.jgroups.protocols.Discovery.up(Discovery.java:263)
| org.jgroups.protocols.PING.up(PING.java:270)
| org.jgroups.protocols.TP$ProtocolAdapter.up(TP.java:2319)
| org.jgroups.protocols.TP.passMessageUp(TP.java:1253)
| org.jgroups.protocols.TP.access$100(TP.java:49)
| org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1830)
| org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1809)
| java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
| java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
| java.lang.Thread.run(Thread.java:619)
|
| "Incoming-12,192.168.1.5:57544" prio=10 tid=0x00000000455b1000 nid=0x7b55 runnable [0x000000003ed7f000..0x000000003ed82bf0]
| java.lang.Thread.State: RUNNABLE
| at java.util.Collections$SynchronizedCollection.isEmpty(Collections.java:1560)
| - locked <0x000000001d3ce1d0> (a java.util.Collections$SynchronizedList)
| at org.jboss.classloader.spi.base.ClassLoaderManager.unregisterLoaderThread(ClassLoaderManager.java:113)
| - locked <0x000000001d3ce1d0> (a java.util.Collections$SynchronizedList)
| at org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:1011)
| - locked <0x000000001ac6f480> (a org.jboss.classloader.spi.base.BaseClassLoader)
| at org.jboss.classloader.spi.base.BaseClassLoader.unlock(BaseClassLoader.java:894)
| at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:289)
| at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:148)
| at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:256)
| at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1099)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:735)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:378)
| - locked <0x0000000015c73390> (a org.jboss.classloader.spi.base.BaseClassLoader)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
| at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
| - locked <0x0000000015c73390> (a org.jboss.classloader.spi.base.BaseClassLoader)
| at java.lang.ClassLoader.defineClass1(Native Method)
| at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
| at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:62)
| at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:509)
| at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:469)
| at java.security.AccessController.doPrivileged(Native Method)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:467)
| - locked <0x0000000015c73390> (a org.jboss.classloader.spi.base.BaseClassLoader)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:444)
| at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:134)
| at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)
| at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:452)
| at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:254)
| at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:148)
| at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:256)
| at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1099)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:735)
| at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:378)
| - locked <0x0000000015c73390> (a org.jboss.classloader.spi.base.BaseClassLoader)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
| at org.jboss.invocation.MarshalledValueInputStream.resolveClass(MarshalledValueInputStream.java:101)
| at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
| at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
| at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
| at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
| at java.util.HashSet.readObject(HashSet.java:291)
| at sun.reflect.GeneratedMethodAccessor209.invoke(Unknown Source)
| at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:597)
| at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
| at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
| at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
| at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
| at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
| at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
| at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
| at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
| at org.jboss.ha.framework.server.ClusterPartition.objectFromByteBufferResponseInternal(ClusterPartition.java:1887)
| at org.jboss.ha.framework.server.ClusterPartition$ResponseMarshallerImpl.objectFromByteBuffer(ClusterPartition.java:2084)
| at org.jgroups.blocks.RpcDispatcher$MarshallerAdapter.objectFromByteBuffer(RpcDispatcher.java:138)
| at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:557)
| at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:368)
| at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:775)
| at org.jgroups.JChannel.up(JChannel.java:1274)
| at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:462)
| at org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:377)
| at org.jgroups.protocols.pbcast.STATE_TRANSFER.up(STATE_TRANSFER.java:144)
| at org.jgroups.protocols.FRAG2.up(FRAG2.java:192)
| at org.jgroups.protocols.FC.up(FC.java:468)
| at org.jgroups.protocols.pbcast.GMS.up(GMS.java:796)
| at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:233)
| at org.jgroups.protocols.UNICAST.handleDataReceived(UNICAST.java:616)
| at org.jgroups.protocols.UNICAST.up(UNICAST.java:282)
| at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:747)
| at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:167)
| at org.jgroups.protocols.FD.up(FD.java:284)
| at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:308)
| at org.jgroups.protocols.MERGE2.up(MERGE2.java:144)
| at org.jgroups.protocols.Discovery.up(Discovery.java:263)
| at org.jgroups.protocols.PING.up(PING.java:270)
| at org.jgroups.protocols.TP$ProtocolAdapter.up(TP.java:2319)
| at org.jgroups.protocols.TP.passMessageUp(TP.java:1253)
| at org.jgroups.protocols.TP.access$100(TP.java:49)
| at org.jgroups.protocols.TP$IncomingPacket.handleMyMessage(TP.java:1830)
| at org.jgroups.protocols.TP$IncomingPacket.run(TP.java:1809)
| at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
| at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
| at java.lang.Thread.run(Thread.java:619)
|
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