linux-kernel - Re: [PATCH 1/2] bdi: make sure congestion states are clear on free

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Date:   Mon, 5 Feb 2018 18:02:31 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Miklos Szeredi <miklos@...redi.hu>,
        Joshua Miller <joshmiller@...com>, kernel-team@...com,
        Jan Kara <jack@...e.cz>, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] bdi: make sure congestion states are clear on free

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@...nel.org>
> Reported-by: Joshua Miller <joshmiller@...com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Jan Kara <jack@...e.cz>
> Cc: stable@...r.kernel.org

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