Messages in this thread | | | From | Roland Kuhn <> | Subject | Re: [OOPS] 2.6.21-rc6-git5 in cfq_dispatch_insert | Date | Wed, 25 Apr 2007 15:59:00 +0200 |
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Hi Jens!
On 25 Apr 2007, at 12:18, Jens Axboe wrote:
> On Wed, Apr 25 2007, Brad Campbell wrote: >> 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. > > Extremely rare in the sense that it takes md and some certain > conditions > to happen for it to trigger. So for most people it'll be extremely > rare, > and for others (such as yourself) that hit it, it wont be so rare :-) > >>> Here's a fix for it, confirmed. >> >> Shall I leave the other debugging in, apply this and run it for a >> few hard >> days? > > Yes, that would be perfect! > Okay, I left all debugging patches in, disabled all kernel debugging .config stuff and gave it a spin with our usual "killer" workload (as far as batch systems are repeatable anyway) and so far there was not a single glitch or message, so I preliminarily conclude that the bug is squashed. The final word will come once my 1800 batch jobs are processed and I have my particle physics result ;-)
Ciao, Roland
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