Re: Writeback threads and freezable

[Tejun Heo]

On Fri, Dec 13, 2013 at 12:49:32PM -0500, Tejun Heo wrote:
> I'm not completely sure what to do.  We can make an exception for
> bdi_wq and thaw it early but that breaks the guarantee that bdi is
> frozen between device suspend and resume invocations and we might as
> well just remove WQ_FREEZABLE from it.  I don't know.

Ugh, so I removed WQ_FREEZABLE on bdi and the same deadlock now
happens through jbd2 which is a freezable kthread.  This whole kthread
freezer thing is rotten and fundamentally broken. :(

-- 
tejun
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