Date: Tue, 24 Apr 2007 18:26:21 +0800 From: LI Xin <delphij@delphij.net> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: 6.2-STABLE deadlock? Message-ID: <462DDB4D.8080507@delphij.net> In-Reply-To: <20070423113912.GE2052@deviant.kiev.zoral.com.ua> References: <20070313140848.GA89182@steerpike.hanley.stade.co.uk> <20070423025631.GA33256@steerpike.hanley.stade.co.uk> <20070423113912.GE2052@deviant.kiev.zoral.com.ua>
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[-- Attachment #1 --] 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 <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGLdtNOfuToMruuMARCnabAJ94rde5il3J+4nL5sSOIfoLvH/O3wCeJgF9 nVv3N1lZcz/5mI5SmueCSxw= =HnXN -----END PGP SIGNATURE-----help
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