Our environment is:
We have a limited threadCound for SCMPolling (8)
We have a system with remoteclients

if one client has problems, all scm threads are hanging on this client and no
more cvs actions are possible
it seams that there is no timeout implemented
if the node (with the problems) is killed you get following

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.triggers.SCMTrigger$Runner runPolling
SEVERE: Failed to record SCM polling
hudson.remoting.RequestAbortedException: java.io.EOFException
at hudson.remoting.Request.abort(Request.java:187)
at hudson.remoting.Channel.terminate(Channel.java:437)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:593)
Caused by: java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)

May 6, 2008 8:39:22 AM hudson.remoting.Channel$ReaderThread run
SEVERE: I/O error in channel compiler ci-dev@george
java.io.EOFException
at
java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2498)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1273)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at hudson.remoting.Channel$ReaderThread.run(Channel.java:574)