Still seeing this, and have verified that it is not necessarily caused by a PermGen memory issue. Likely need to open a new JIRA issue for this. My main symptom is persistent failures from all builds on a slave, with exception of the form:

java.io.InvalidClassException: hudson.FilePath$FileCallableWrapper; local class incompatible: stream classdesc

Also seeing:

Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.jvnet.hudson.Windows$MEMORYSTATUSEX

Restarting the slave always seems to clear the issue.

Is a timeout during a diskspace monitoring attempt leaving a class in an unitialized state perhaps?

17-Nov-2012 09:18:16 hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor lonws10509 for Free Swap Space
java.io.IOException: Remote call on lonws10509 failed
at hudson.remoting.Channel.call(Channel.java:673)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor(SwapSpaceMonitor.java:83)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor(SwapSpaceMonitor.java:81)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.jvnet.hudson.Windows$MEMORYSTATUSEX
at org.jvnet.hudson.Windows.monitor(Windows.java:40)
at hudson.node_monitors.SwapSpaceMonitor$MonitorTask.call(SwapSpaceMonitor.java:113)
at hudson.node_monitors.SwapSpaceMonitor$MonitorTask.call(SwapSpaceMonitor.java:99)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at hudson.remoting.Engine$1$1.run(Engine.java:60)
at java.lang.Thread.run(Thread.java:619)
Exception in thread "Monitoring lonws10894-psft_prd for Free Disk Space" java.lang.reflect.UndeclaredThrowableException
at hudson.remoting.$Proxy6.fetch2(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:122)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getInheritableMethod(ObjectStreamClass.java:1349)
at java.io.ObjectStreamClass.access$2200(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:448)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1106)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at hudson.remoting.UserRequest._serialize(UserRequest.java:155)
at hudson.remoting.UserRequest.serialize(UserRequest.java:164)
at hudson.remoting.UserRequest.perform(UserRequest.java:126)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at hudson.remoting.Engine$1$1.run(Engine.java:60)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:127)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:160)
... 27 more
Exception in thread "Monitoring lonws10894-psft_prd for Free Temp Space" java.lang.reflect.UndeclaredThrowableException
at hudson.remoting.$Proxy6.fetch2(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:122)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getInheritableMethod(ObjectStreamClass.java:1349)
at java.io.ObjectStreamClass.access$2200(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:448)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1106)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at hudson.remoting.UserRequest._serialize(UserRequest.java:155)
at hudson.remoting.UserRequest.serialize(UserRequest.java:164)
at hudson.remoting.UserRequest.perform(UserRequest.java:126)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at hudson.remoting.Engine$1$1.run(Engine.java:60)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:127)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:160)
... 27 more

I am seeing this during the start process, when the slaves are coming online (we have approx 20 slaves). So I also suspect it may be related to the slaves.

My server is on Centos6, but the startup messages are similar:

Summary:
============
1) a bunch of 'xxx monitoring activity is still in progress. Interrupting' messages
2) a bunch of 'Node monitoring someslave for xxx aborted' messages w/InterruptedExceptions
3) a few warnings of the form WARNING: Failed to monitor someslave for XXX – due to IOException: remote file operation failed – due to failed to deserialize the Callable object
followed by
4) WARNING: Failed to monitor someslave for XXX – due to InvalidClassException: ... local class incompatible: stream classdesc serialVersionUID

Details:
============
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record <init>
WARNING: Previous Architecture monitoring activity still in progress. Interrupting
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record <init>
WARNING: Previous Clock Difference monitoring activity still in progress. Interrupting
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record <init>
...etc ...
WARNING: Previous Clock Difference monitoring activity still in progress. Interrupting
Nov 21, 2012 8:02:00 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Node monitoring slave1 for Architecture aborted.
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.Channel.call(Channel.java:665)
at hudson.node_monitors.ArchitectureMonitor$DescriptorImpl.monitor(ArchitectureMonitor.java:43)
at hudson.node_monitors.ArchitectureMonitor$DescriptorImpl.monitor(ArchitectureMonitor.java:40)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Node monitoring master for Response Time aborted.
java.lang.InterruptedException
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1024)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1303)
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:227)
at java.util.concurrent.FutureTask.get(FutureTask.java:91)
at hudson.remoting.LocalChannel$2.get(LocalChannel.java:81)
at hudson.node_monitors.ResponseTimeMonitor$1.monitor(ResponseTimeMonitor.java:60)
at hudson.node_monitors.ResponseTimeMonitor$1.monitor(ResponseTimeMonitor.java:52)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Node monitoring slave2 for Free Swap Space aborted.
...etc...
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Node monitoring slave2 for Free Disk Space aborted.
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.Channel.call(Channel.java:665)
at hudson.FilePath.act(FilePath.java:841)
at hudson.FilePath.act(FilePath.java:825)
at hudson.node_monitors.DiskSpaceMonitor$1.getFreeSpace(DiskSpaceMonitor.java:71)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:169)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:49)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor slave3 for Free Temp Space
hudson.util.IOException2: remote file operation failed: /scratch/jslave at hudson.remoting.Channel@557d2390:slave3
at hudson.FilePath.act(FilePath.java:848)
at hudson.FilePath.act(FilePath.java:825)
at hudson.node_monitors.TemporarySpaceMonitor$1.getFreeSpace(TemporarySpaceMonitor.java:73)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:169)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:49)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Caused by: java.io.IOException: Remote call on slave3 failed
at hudson.remoting.Channel.call(Channel.java:674)
at hudson.FilePath.act(FilePath.java:841)
... 5 more
Caused by: java.lang.Error: Failed to deserialize the Callable object.
at hudson.remoting.UserRequest.perform(UserRequest.java:104)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Caused by: java.lang.reflect.UndeclaredThrowableException
at $Proxy5.fetch2(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:122)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1382)
at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:438)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:547)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1582)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
at hudson.remoting.UserRequest.perform(UserRequest.java:98)
... 8 more
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:160)
... 33 more
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor slave3 for Free Temp Space
hudson.util.IOException2: remote file operation failed: /scratch/jslave at hudson.remoting.Channel@557d2390:slave3
at hudson.FilePath.act(FilePath.java:848)
at hudson.FilePath.act(FilePath.java:825)
at hudson.node_monitors.TemporarySpaceMonitor$1.getFreeSpace(TemporarySpaceMonitor.java:73)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:169)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:49)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Caused by: java.io.IOException: Remote call on slave3 failed
at hudson.remoting.Channel.call(Channel.java:674)
at hudson.FilePath.act(FilePath.java:841)
... 5 more
Caused by: java.lang.Error: Failed to deserialize the Callable object.
at hudson.remoting.UserRequest.perform(UserRequest.java:104)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Caused by: java.lang.reflect.UndeclaredThrowableException
at $Proxy5.fetch2(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:122)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1382)
at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:438)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:547)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1582)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
at hudson.remoting.UserRequest.perform(UserRequest.java:98)
... 8 more
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:160)
... 33 more
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor slave3 for Free Temp Space
hudson.util.IOException2: remote file operation failed: /scratch/jslave at hudson.remoting.Channel@557d2390:slave3
at hudson.FilePath.act(FilePath.java:848)
at hudson.FilePath.act(FilePath.java:825)
at hudson.node_monitors.TemporarySpaceMonitor$1.getFreeSpace(TemporarySpaceMonitor.java:73)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:169)
at hudson.node_monitors.DiskSpaceMonitorDescriptor.monitor(DiskSpaceMonitorDescriptor.java:49)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Caused by: java.io.IOException: Remote call on slave3 failed
at hudson.remoting.Channel.call(Channel.java:674)
at hudson.FilePath.act(FilePath.java:841)
... 5 more
Caused by: java.lang.Error: Failed to deserialize the Callable object.
at hudson.remoting.UserRequest.perform(UserRequest.java:104)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Caused by: java.lang.reflect.UndeclaredThrowableException
at $Proxy5.fetch2(Unknown Source)
at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:122)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethod(Class.java:1935)
at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1382)
at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:52)
at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:438)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:413)
at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:310)
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:547)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1582)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
at hudson.remoting.UserRequest.perform(UserRequest.java:98)
... 8 more
Caused by: java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:160)
... 33 more
Nov 21, 2012 8:02:01 PM hudson.slaves.CommandLauncher launch
INFO: slave agent launched for slave2
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record <init>
WARNING: Previous Free Swap Space monitoring activity still in progress. Interrupting
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Node monitoring slave2 for Free Swap Space aborted.
java.lang.InterruptedException
at java.lang.Object.wait(Native Method)
at hudson.remoting.Request.call(Request.java:146)
at hudson.remoting.Channel.call(Channel.java:665)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor(SwapSpaceMonitor.java:83)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor(SwapSpaceMonitor.java:81)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run(AbstractNodeMonitorDescriptor.java:219)
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor slave3 for Free Swap Space

java.io.InvalidClassException: hudson.node_monitors.SwapSpaceMonitor$MonitorTask; local class incompatible: stream classdesc serialVersionUID = 1, local class serialVersionUID = 1184166703664094906
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1582)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
at hudson.remoting.UserRequest.perform(UserRequest.java:98)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Nov 21, 2012 8:02:01 PM hudson.node_monitors.AbstractNodeMonitorDescriptor$Record <init>
WARNING: Previous Free Temp Space monitoring activity still in progress. Interrupting

I should clarify, in case it is relevant – I normally dont restart all of the slaves every time I restart the master. In this case all the slaves were already running their listener processes. In this repro process, I restarted only the master.

I can consistently repro this issue every time I restart the master.

Still happening with Jenkins 1.492

I think one possible cause of this issue is if you aggressively clean the TEMP directory on the master or slave servers. It may be that removal of one of the remoting files that hudson/jenkins creates there causes this cryptic exception. Even the plain old Windows disk clean up might cause this.

Perhaps Jenkins could lock these temp files while it runs so that they can't accidentally be deleted?

Regarding the below comments, it is not an EnvInject issue.
Assign to core

Is this still an issue on recent Jenkins versions? What are the Java runtimes (master + slaves) and OS involved?

I (being the initial bug reporter) can't provide any updates on this issue since I'm no longer a user of the envinject plugin, sorry.

Thanks for the update, Michael.

Anyone else experiencing this exact issue on recent Jenkins versions? Could you provide the information requested above?

I am using jenkins ver. 1.561 and have teh memory leak. It caches almost all the memory in a day or 2, and have to cleanup the cache.

I do use envinject plugin version 1.89.

Does Anyone use diff versions of jenkins and envinject plugin without memory leak?

Thanks

Sounds obsolete.