Kostik Belousov wrote: > 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.
I'm not very sure if this is specific to one disk controller. Actually I got some occasional reports about similar hangs on amd64 6.2-RELEASE (slightly patched version) that most of processes stuck in the 'ufs' state, under very light load, the box was equipped with amr(4) RAID. I was not able to reproduce the problem at my lab, though, it's still unknown that how to trigger the livelock :-( Still need some investigate on their production system. Cheers, -- Xin LI <[EMAIL PROTECTED]> http://www.delphij.net/ FreeBSD - The Power to Serve!
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