XFS stack corruption: BUG: unable to handle kernel paging request

[Christoph Hellwig]

On Wed, Jun 16, 2010 at 08:10:23AM +0200, Michael Monnerie wrote:
> This happened while I did an "rsync" to that server, and it was searching the files to sync.
> Messages grabbed from the console:

This might as well be another stack overflow.  You don't happen to have
more lines of the stack trace?  I fear this might be another case of
direct reclaim hitting you.

Try backporting commit 070ecdca54dde9577d2697088e74e45568f48efb
"xfs: skip writeback from reclaim context", that should get rid of
places calling into ->writepage with already deep stack usage.