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Mysterious hangs -- what to do?

To: Joshua Baker-LePain <jlb17@xxxxxxxx>
Subject: Mysterious hangs -- what to do?
From: Adrian Head <ahead@xxxxxxxxxxxxxx>
Date: Thu, 20 Dec 2001 00:03:55 +1000
Cc: <linux-xfs@xxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
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Your problem sounds very simular to what I have experienced.  

I found back in Sep 
http://marc.theaimsgroup.com/?l=linux-xfs&m=100008724000734&w=2 
that under some tests the machine would hang or die.  This would happen when 
there were many processes moving data around the XFS volume.  

I originally found this when I had heaps of NFS and SMB clients uploading 
data at the same time.  I was able to narrow the problem down to just a 
kernel-xfs issue and could simulate the behaviour using a simple shell script 
to start many background cp procceses.  What would happen is kupdated would 
seem to go into deadlock and the machine would stop responding.  The machine 
could still be pinged on the network but console or ssh would not be 
responsive.

Then reciently I was building a few new file servers so I decided to get  the 
latest XFS kernel (2.4.16-xfs) and try again.  A simular problem occured.  
After disscussions on this list 
http://marc.theaimsgroup.com/?l=linux-xfs&m=100855332323037&w=2
I tried yesterday's CVS kernel and everything is now running sweet.

I have yet to rerun all my tests but at the moment it seems to pass the tests 
that use to kill it.

When you looked at the processes in the Alt-SysRq output was kupdated one of 
the processes running?  If it was I expect you have just hit the same problem 
I had.

- -- 
Adrian Head

(Public Key available on request.)
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