linux-kernel - Re: BUG: unable to handle kernel paging request xfs_is_delayed

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Date:	Sun, 24 Jul 2011 08:17:14 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	T?r?k Edwin <edwintorok@...il.com>
Cc:	xfs-masters@....sgi.com, xfs@....sgi.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request xfs_is_delayed_page

On Thu, Jul 21, 2011 at 11:55:04PM +0300, T?r?k Edwin wrote:
> Not sure what the BUG means: did XFS ran out of memory when trying to write the 4GB coredump, as it wanted to allocate an extra 4G temporarely to hold it?
> 

It means we dereferenced an invalid pointer in xfs_is_delayed_page,
which is called from the writeback code, which is pretty odd.  We
haven't really touched that particular piece of code for a long time,
and it really doesn't derefence many pointers, basically just
page->mapping, page->private and the flags and b_this_page fields
in the buffer head.

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