From: Chris Mason <clm@fb.com>
Subject: Re: [PATCH 2/2] ext4: implement cgroup writeback support
Date: Wed, 23 Sep 2015 13:53:37 -0400
Message-ID: <20150923175337.GD25218@ret.masoncoding.com>
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Cc: <linux-ext4@vger.kernel.org>, <hannes@cmpxchg.org>,
	<axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
	"Theodore Ts'o" <tytso@mit.edu>, <linux-fsdevel@vger.kernel.org>,
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To: Artem Bityutskiy <dedekind1@gmail.com>
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On Wed, Sep 23, 2015 at 08:41:25PM +0300, Artem Bityutskiy wrote:
>    Hi
> 
>    $ sync
>    $ reboot

If this is case, it should be possible to reproduce with:

cp a bunch of stuff to /ext4
unmount /ext4
mount ext4
compare data

If you're not getting a clean unmount of the test FS during the reboot,
its a different test.  Trying to reproduce here, so far its clean.
Could you please double check for failed unmounts?

Thanks,
Chris