linux-kernel - Re: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2)

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Message-ID: <20080517233908.GA15279@infradead.org>
Date:	Sat, 17 May 2008 19:39:08 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alistair John Strachan <alistair@...zero.co.uk>,
	Jens Axboe <jens.axboe@...cle.com>, xfs@....sgi.com,
	Neil Brown <neilb@...e.de>, Nick Piggin <npiggin@...e.de>,
	linux-kernel@...r.kernel.org, dgc@....com
Subject: Re: XFS/md/blkdev warning (was Re: Linux 2.6.26-rc2)

On Sat, May 17, 2008 at 02:17:37PM -0700, Linus Torvalds wrote:
> > [4294293.003500]  [<ffffffff8028106a>] __kmalloc+0x3e/0xe6
> > [4294293.003500]  [<ffffffff803067fc>] ? xfs_iflush_int+0x272/0x2fb
> > [4294293.003500]  [<ffffffff80320552>] kmem_alloc+0x6a/0xd1
> > [4294293.003500]  [<ffffffff80307a9c>] xfs_iflush_cluster+0x4b/0x33f
> > [4294293.003500]  [<ffffffff8030681e>] ? xfs_iflush_int+0x294/0x2fb
> > [4294293.003500]  [<ffffffff80307f4b>] xfs_iflush+0x1bb/0x29d
> > [4294293.003500]  [<ffffffff8031bc30>] xfs_inode_flush+0xb8/0xdd
> > [4294293.003500]  [<ffffffff80328b1f>] xfs_fs_write_inode+0x30/0x4c
> 
> And as a result, all the XFS stuff is then waiting for that lock which is 
> held by pdflush above:

Btw, just that function has a missing GFP_NOFS and a too large
allocation which were fixed by Dave Chinner but aren't in mainline
yet.  Can you check whether it still happens with the patch below?


View attachment "xfs-icluster-add-nofs" of type "text/plain" (2165 bytes)

View attachment "xfs-fix-icluster-alloc-size" of type "text/plain" (1642 bytes)