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Date: Wed, 25 Apr 2007 14:02:15 +0400 From: Brad Campbell <brad@...p.net.au> To: Jens Axboe <jens.axboe@...cle.com> CC: Neil Brown <neilb@...e.de>, Chuck Ebbert <cebbert@...hat.com>, lkml <linux-kernel@...r.kernel.org> Subject: Re: [OOPS] 2.6.21-rc6-git5 in cfq_dispatch_insert Jens Axboe wrote: > It looks to be extremely rare. Aliases are extremely rare, front merges > are rare. And you need both to happen with the details you outlined. But > it's a large user base, and we've had 3-4 reports on this in the past > months. So it obviously does happen. I could not make it trigger without > doctoring the unplug code when I used aio. Well, not that rare on this particular machine (I had a case where I could reproduce it in less than an hour of normal use previously on this box), and I've had it occur a number of times on my servers, I just never reported it before as I never took the time to set up a serial console and capture the oops. > Here's a fix for it, confirmed. Shall I leave the other debugging in, apply this and run it for a few hard days? Brad -- "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." -- Douglas Adams - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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