6.2-STABLE deadlock?

[Kostik Belousov]

On Mon, Apr 23, 2007 at 03:56:32AM +0100, Adrian Wontroba wrote:
> On Tue, Mar 13, 2007 at 02:08:48PM +0000, Adrian Wontroba wrote:
> > At work, amoungst my stable of old computers running FreeBSD, I have a
> > Fujitsu M800 - a 4 Zeon SMP processor with 4 GB of memory. This
> > primarily runs Nagios and a small and lightly used MySQL database, along
> > with a few inbound FTP transfers per minute. It has a Mylex card based
> > disc subsystem, ruling out crash dumps.
> > 
> > At some point during 5.5-STABLE this machine started to occasionally hang ...
> 
> Another 6-STABLE (cvsupped on 27/03/07) example, with diagnostics taken
> rather sooner after the hang.  Processes with wmesg=ufs feature often in
> the ps output.
> 
> http://www.stade.co.uk/crash1/

I would suspect the mlx controller. There is several processes (for instance,
988, 50918) waiting for completion of block read, and processes in the "ufs"
states are the result of the lock cascade, IMHO.
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