[Bug 542681] Re: BUG: scheduling while atomic: apache2/19695/0x80422dd3

[ngregory]

I currently run a cluster of jaunty webdav enabled Apaches. All are
under fairly heavy write load. Until very recently they have been fairly
stable, but over the last week i have seen a large increase in kernel
panics.

No software change I can think of has introduced this behaviour.The
issue effects multiple servers all with identical hardware
configurations.  I've tried updating the kernel to versions from karmic
+ lucid (even tried a 2.6.33 based kernel) all have no effect on this
issue.

I've attempted to capture a crashdump of the issue - but have had little
success. I have however managed to capture panic output via netconsole
(results attached).

I've tried tweaking various vm related sysctl to help ease the problem -
however the panics continue. Server crashes tend to be immediate -
sometimes proceeded by a high load spike.


** Attachment added: "panic1-2.6.28.txt"
   http://launchpadlibrarian.net/41415048/panic1-2.6.28.txt

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BUG: scheduling while atomic: apache2/19695/0x80422dd3
https://bugs.launchpad.net/bugs/542681
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