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Re: kernel BUG at drivers/block/virtio_blk.c:172!

To: Jens Axboe <axboe@xxxxxxxxx>
Subject: Re: kernel BUG at drivers/block/virtio_blk.c:172!
From: Ming Lei <tom.leiming@xxxxxxxxx>
Date: Tue, 11 Nov 2014 08:56:27 +0800
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
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References: <20141107080416.0837a88c@xxxxxxxxxxxxxxxxxxxxxxx> <87bnofnzop.fsf@xxxxxxxxxxxxxxx> <54614AE7.2080204@xxxxxxxxx>
On Tue, Nov 11, 2014 at 7:31 AM, Jens Axboe <axboe@xxxxxxxxx> wrote:
> On 2014-11-10 02:59, Rusty Russell wrote:
>>
>> Jeff Layton <jlayton@xxxxxxxxxxxxxxx> writes:
>>
>>> In the latest Fedora rawhide kernel in the repos, I'm seeing the
>>> following oops when mounting xfs. rc2-ish kernels seem to be fine:
>>>
>>> [   64.669633] ------------[ cut here ]------------
>>> [   64.670008] kernel BUG at drivers/block/virtio_blk.c:172!
>>
>>
>> Hmm, that's:
>>
>>         BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
>>
>> But during our probe routine we said:
>>
>>         /* We can handle whatever the host told us to handle. */
>>         blk_queue_max_segments(q, vblk->sg_elems-2);
>>
>> Jens?
>
>
> Known, I'm afraid, Ming is looking into it.

There is one obvious bug which should have been fixed by below
patch(0001-block-blk-merge-fix-blk_recount_segments.patch"):

http://marc.info/?l=linux-virtualization&m=141562191719405&q=p3

And there might be another one, I appreciate someone can post
log which is printed by patch("blk-seg.patch") in below link if the
bug still can be triggered even with above fix:

http://marc.info/?l=linux-virtualization&m=141473040618467&q=p3


Thanks,
-- 
Ming Lei

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