Re: [PATCH 1/3] xfs: fix the AG loop in xfs_alloc_vextent for busy extents

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On Tue, Nov 08, 2016 at 05:15:39PM +1100, Dave Chinner wrote:
> Here's the problem: At ENOSPC, we dirty AG headers fixing freelists,
> then fail to allocate inodes, resulting in a shutdown - a regression
> that xfs/076 trips over quite regularly on my test machines.

I could not reproduce it, but based on the discussion with Brian I
agree.  But that sad part is that this bug already exists in the
existing code due to the busy extent tracking code - my little
patch just made it a lot easier to hit.  I'll see how I can come up
with a proper fix for it.
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