linux-kernel - Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

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Date:	Thu, 4 Oct 2007 09:28:41 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Don Mullis <dwm@...r.net>, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: 2.6.23-rc8-mm2: OOPS in mmc on boot

On Wed, 3 Oct 2007 23:16:59 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 03 Oct 2007 23:11:02 -0700 Don Mullis <dwm@...r.net> wrote:
> 
> > OOPS followed by a 3 minute timeout, then completion of boot.
> > Not seen if card (Kingston microSD adapter) is ejected; not seen in
> > 2.6.23-rc8. Running on a Dell XPS M1330 laptop.
> > 

Impossible! My code is bug free!

> > [   13.709831] EIP is at blk_rq_map_sg+0xc0/0x160
> > [   13.711857] Call Trace:
> > [   13.711971]  [<f8c39e58>] mmc_queue_map_sg+0x28/0xc0 [mmc_block]
> > [   13.712085]  [<f8c396c9>] mmc_blk_issue_rq+0x199/0x780 [mmc_block]
> > [   13.712193]  [<f8c3a168>] mmc_queue_thread+0x78/0xe0 [mmc_block]

Seems to be in the handling of the bounce buffer. I don't see how any
of the parameters to blk_rq_map_sg() could be incorrect though, so I
suspect the problem is not in the mmc layer.

Don, is MMC_BLOCK_BOUNCE enabled? Could you try toggling it and see if
things change?

> 
> This could be due to git-block changes (or a lack of them ;))
> 

There are no pending patches, or recent changes that mess about in any
real way in there.

Don, when did this work last?

Rgds
Pierre

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