Re: [Linux-stable-mirror] [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@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