Re: Boot failure on Arndale with next-20131105

[Olof Johansson]

On Tue, Nov 5, 2013 at 12:56 PM, Chris Mason <chris.mason@xxxxxxxxxxxx> wrote:
> Quoting Olof Johansson (2013-11-05 15:38:33)
>> On Tue, Nov 5, 2013 at 12:33 PM, Chris Mason <chris.mason@xxxxxxxxxxxx> wrote:
>> > Quoting Olof Johansson (2013-11-05 15:23:51)
>> >> On Tue, Nov 5, 2013 at 11:33 AM, Jens Axboe <axboe@xxxxxxxxx> wrote:
>> >
>> > [ horrible crashes fixed by removing my patch ]
>> >
>> >> > Very weird! What file system is being used?
>> >>
>> >> Most of my failures have happened on regular MMC cards with ext4
>> >> filesystems on them.
>> >>
>> >> Note that the panic happens during device probe / partition table
>> >> scanning, not after mounting the filesystem.
>> >>
>> >> Giving your patch a go now across the board. I'm very concerned about
>> >> the reports of bisectability, build failures and heaps of warnings
>> >> though. Did the 0-day builder pick up any of those? :-/
>> >>
>> >
>> > Hmmm, is bcache in your config?
>>
>> Doesn't look that way -- no ARM defconfigs enable it (it's what I
>> build and boot), and the option defaults to off and nothing selects
>> it.
>
> 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.

Thanks, giving it a go now (will have results in 30+ minutes). Jens'
patch didn't make a difference, which makes sense given lack of dm
usage.


-Olof
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