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Date:	Sat, 31 Dec 2011 22:15:32 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Ted Ts'o <tytso@....edu>,
	"Steinar H. Gunderson" <sgunderson@...foot.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: 3.2.0-rc5 oops in ext4

On Sat, 31 Dec 2011, Ted Ts'o wrote:
> On Sun, Jan 01, 2012 at 03:47:58AM +0100, Steinar H. Gunderson wrote:
> > Hi,
> > 
> > During relatively heavy write load, my 3.2.0-rc5 kernel oopsed (after sixteen
> > days of uptime, so this is not easily reproducible):
> 
> This wasn't the whole kernel oops message.  Can you get any lines
> earlier than this?  (Preferably beginning wit
>  "-----[ cut here ]-----"?)

Nah, not necessary:

RIP: 0010:[<ffffffff81355161>]  [<ffffffff81355161>] _raw_spin_lock+0x9/0x20
[<ffffffff8110d19e>] create_empty_buffers+0x43/0xae
[<ffffffffa030c003>] ext4_discard_partial_page_buffers_no_lock+0x9d/0x3ee [ext4]
[<ffffffffa030c60f>] ext4_da_write_end+0x231/0x2df [ext4]

is one of the symptoms I was seeing - fixed in -rc6 by Yongqiang's
093e6e3666f47d29763a235b404c84ee47ba8bb0
ext4: correctly handle pages w/o buffers in ext4_discard_partial_buffers()

Hugh
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