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Subject: Re: a9f38e1dec ("floppy: convert to blk-mq"): INFO: task mount:661
 blocked for more than 120 seconds.
To:     kernel test robot <lkp@intel.com>, Omar Sandoval <osandov@fb.com>
Cc:     LKP <lkp@01.org>, linux-kernel@vger.kernel.org,
        linux-block@vger.kernel.org
References: <5bf0d0d9.2S1lqKo/21KXGcuH%lkp@intel.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <4baa37de-8ec3-45cb-2a31-f5eff0806f48@kernel.dk>
Date:   Sun, 18 Nov 2018 20:06:25 -0700
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On 11/17/18 7:39 PM, kernel test robot wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> 
> commit a9f38e1dec107af70d81338332494bf0a1e76597
> Author:     Omar Sandoval <osandov@fb.com>
> AuthorDate: Mon Oct 15 09:21:34 2018 -0600
> Commit:     Jens Axboe <axboe@kernel.dk>
> CommitDate: Tue Oct 16 09:50:14 2018 -0600
> 
>     floppy: convert to blk-mq
>     
>     This driver likes to fetch requests from all over the place, so make
>     queue_rq put requests on a list so that the logic stays the same. Tested
>     with QEMU.
>     
>     Signed-off-by: Omar Sandoval <osandov@fb.com>
>     
>     Converted to blk_mq_init_sq_queue() and fixed a few spots where the
>     tag_set leaked on cleanup.
>     
>     Signed-off-by: Jens Axboe <axboe@kernel.dk>

This should be fixed by:

commit de7b75d82f70c5469675b99ad632983c50b6f7e7
Author: Jens Axboe <axboe@kernel.dk>
Date:   Fri Nov 9 15:58:40 2018 -0700

    floppy: fix race condition in __floppy_read_block_0()

which isn't in the tree that you tested. It's in -rc3, and in Linus's
tree since:

commit 59749c2d49bf28df69ac4bcabf1f69b00d3dca59
Merge: 9b5f361ac4a9 8dc765d438f1
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri Nov 16 09:31:59 2018 -0600

    Merge tag 'for-linus-20181115' of git://git.kernel.dk/linux-block

-- 
Jens Axboe