From: Christoph Hellwig <hch@infradead.org>
To: simon@thekelleys.org.uk
Cc: xfs@oss.sgi.com
Subject: Re: XFS stack overflow?
Date: Thu, 31 Mar 2011 10:37:10 -0400 [thread overview]
Message-ID: <20110331143710.GA12821@infradead.org> (raw)
In-Reply-To: <1301581135.748149.10230.nullmailer@thekelleys.org.uk>
On Thu, Mar 31, 2011 at 03:18:55PM +0100, simon@thekelleys.org.uk wrote:
> x86_64
> Storage is fibrechannel attached and the filesystem is hosted on a
> LVM block device that concatentates four partitions, so the block access
> is going via a stack of LVM, multipath and Q-logic drivers.
> Network is Intel 10G ethernet (gxbe driver)
> Kernel is 2.6.32 with Debian patches. (both kernels)
Yes, this very much looks like a stack overflow caused by direct
reclaim from a context with a lot of stack usage into a filesystem (XFS
in this case) with a deep storage stack underneath.
The fix for this is to disable direct reclaim, which the VM maintainers
refuse. We finally gave in and added a hack similar to the other
modern filesystems to prevent this from inside XFS.
Try backporting commits:
"xfs: skip writeback from reclaim context"
and
"xfs: allow writeback from kswapd"
from current mainline to avoid these kinds of issues.
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prev parent reply other threads:[~2011-03-31 14:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-31 14:18 XFS stack overflow? simon
2011-03-31 14:37 ` Christoph Hellwig [this message]
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