Re: writeback completion soft lockup BUG in folio_wake_bit()

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On Fri, Mar 18, 2022 at 10:14:03AM -0400, Brian Foster wrote:
> So I'm not clear on where we're at with this patch vs. something that
> moves (or drops) the wb wait loop vs. the wait and set thing (which
> seems more invasive and longer term), but FWIW.. this patch survived
> over 10k iterations of the reproducer test yesterday (the problem
> typically reproduces in ~1k or so iterations on average) and an
> overnight fstests run without regression.

Excellent!  I'm going to propose these two patches for -rc1 (I don't
think we want to be playing with this after -rc8).  I agree the
wait-and-set approach is a little further out.

(patches attached)





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