lkml.org 
[lkml]   [2005]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Raid-6 hang on write.
Neil Brown wrote:
> On Friday February 25, brad@wasp.net.au wrote:
>
>>Turning on debugging in raid6main.c and md.c make it much harder to hit. So I'm assuming something
>>timing related.
>>
>>raid6d --> md_check_recovery --> generic_make_request --> make_request --> get_active_stripe
>
>
> Yes, there is a real problem here. I see if I can figure out the best
> way to remedy it...
> However I think you reported this problem against a non "-mm" kernel,
> and the path from md_check_recovery to generic_make_requests only
> exists in "-mm".
>
> Could you please confirm if there is a problem with
> 2.6.11-rc4-bk4->bk10

There is (was). I have three kernels I was testing against. 2.6.11-rc4-bk4, 2.6.11-rc4-bk10 and
2.6.11-rc4-mm1. I moved onto 2.6.11-rc4-mm1 for my main debugging (inserting lots of printks and
generally doing stuff that was going to crash). I hope to reproduce the faults against the vanilla
2.6.11-rc4 kernels and I'm now testing with 2.6.11-rc5-bk2.

As per the original bug report, 2.6.11-rc4-bk(4/10) locked in [<c0268574>]
get_active_stripe+0x224/0x260. Although unlike -mm1 I'm not sure of the sequence of events that
caused it and it's not anywhere as easy to hit. I am willing to investigate as time allows however.

Testing 2.6.11-rc5-bk2 and it of course is flatly refusing to misbehave. I'll keep beating on it for
a couple of days and after writing 3TB with 2.6.11-rc5-bk2, I'll go back to the older kernels and
try and reproduce the failure there. It *did* lockup 4 times in a row in get_active_stripe on the
older non -mm kernels.

Regards,
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@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:10    [W:0.063 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site