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Date:   Mon, 5 Feb 2018 18:02:31 -0500
From:   Johannes Weiner <hannes@cmpxchg.org>
To:     Tejun Heo <tj@kernel.org>
Cc:     Jens Axboe <axboe@kernel.dk>, Miklos Szeredi <miklos@szeredi.hu>,
        Joshua Miller <joshmiller@fb.com>, kernel-team@fb.com,
        Jan Kara <jack@suse.cz>, stable@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/2] bdi: make sure congestion states are clear on free
Message-ID: <20180205230231.GA24824@cmpxchg.org>
References: <20180202175328.GL1121507@devbig577.frc2.facebook.com>
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On Fri, Feb 02, 2018 at 09:53:28AM -0800, Tejun Heo wrote:
> FUSE has a bug where it fails to clear congestion states if a
> connection gets aborted while congested, which can leave
> nr_wb_congested[] stuck until reboot causing wait_iff_congested() to
> wait spuriously.
> 
> While the bdi owner, FUSE, is primarily responsible for clearing
> congestion states before destroying bdi_writebacks, bdi layer can
> ensure that congestion states are not leaked beyond bdi_writeback
> lifecycle.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reported-by: Joshua Miller <joshmiller@fb.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Jan Kara <jack@suse.cz>
> Cc: stable@vger.kernel.org

Acked-by: Johannes Weiner <hannes@cmpxchg.org>