From: Jens Axboe <axboe@fb.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: <linux-fsdevel@vger.kernel.org>
Subject: Re: [BUG] Oops in inode_to_bdi()
Date: Wed, 21 Jan 2015 13:04:04 -0700 [thread overview]
Message-ID: <54C00634.1080106@fb.com> (raw)
In-Reply-To: <54BFFEF3.1070809@fb.com>
On 01/21/2015 12:33 PM, Jens Axboe wrote:
> On 01/21/2015 12:29 PM, Christoph Hellwig wrote:
>> On Wed, Jan 21, 2015 at 12:17:07PM -0700, Jens Axboe wrote:
>>> Christoph,
>>>
>>> Ran into this one while testing. Looks like mapping->host is NULL, off
>>> the shmem_writepage().
>>
>> Hmm. Not sure how this can happen, but for a NULL inode we can
>> always just return noop_backing_dev_info safely, I'll cook up a patch.
>
> I got 8 of them in a row. Current kernel is running with the attached,
> just to see if I can reproduce it.
Works fine with the debug patch. Added a page dump for when we hit this:
page:ffffea0001afa680 count:2 mapcount:0 mapping: (null) index:0x0
flags: 0x40000000000d0009(locked|uptodate|swapcache|reclaim|swapbacked)
I'll commit the NULL inode work-around.
--
Jens Axboe
next prev parent reply other threads:[~2015-01-21 20:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-21 19:17 [BUG] Oops in inode_to_bdi() Jens Axboe
2015-01-21 19:29 ` Christoph Hellwig
2015-01-21 19:33 ` Jens Axboe
2015-01-21 20:04 ` Jens Axboe [this message]
2015-01-24 1:22 ` Omar Sandoval
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