linux-kernel - Re: Boot failure on Arndale with next-20131105

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Date:	Tue, 5 Nov 2013 19:04:32 -0500
From:	Chris Mason <chris.mason@...ionio.com>
To:	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>
CC:	Jens Axboe <axboe@...nel.dk>,
	Tushar Behera <tushar.behera@...aro.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Kent Overstreet <kmo@...erainc.com>
Subject: Re: Boot failure on Arndale with next-20131105

Quoting Olof Johansson (2013-11-05 17:41:42)
> On Tue, Nov 5, 2013 at 2:06 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> > On 11/05/2013 01:56 PM, Chris Mason wrote:
> >> Quoting Olof Johansson (2013-11-05 15:38:33)
> >>> On Tue, Nov 5, 2013 at 12:33 PM, Chris Mason <chris.mason@...ionio.com> wrote:
> >>>> Quoting Olof Johansson (2013-11-05 15:23:51)
> >>>>> On Tue, Nov 5, 2013 at 11:33 AM, Jens Axboe <axboe@...nel.dk> wrote:
> >>>>
> >>>> [ horrible crashes fixed by removing my patch ]
> >>>>
> > ...
> >> Ok, I think I see it.  My guess is that you're hitting bounce buffers.
> >> __blk_queue_bounce is the only caller of the bio splitting code I can
> >> see that you might be hitting.
> >>
> >> My first patch exposed a lurking bug in bio_clone_biovec.  Basically
> >> bio->bi_vcnt is being doubled instead of initialized.
> >>
> >> This patch is only compile tested, but I think it'll fix it.
> >
> > Tested-by: Stephen Warren <swarren@...dia.com>
> > (this fixes the issue on Tegra30/Beaver at least)
> 
> Tested-by: Olof Johansson <olof@...om.net>
> 
> This resolves boot failures on:
> * Tegra30/beaver
> * OMAP4/panda
> * i.MX6/wandboard
> 
> Thanks Chris!

Perfect, thanks for bisecting and trying the patches.  Kent, if things
get rebased, could you please fold this patch and my bi_vcnt patch in?

-chris

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