Recently we noticed generic/390 failing on powerpc systems. This test
basically does a freeze-unfreeze loop in parallel with fsstress on the
FS to detect any races in the code paths.

We noticed that the test started failing due to kernel WARN_ONs because
quota_release_work workqueue started executing while the FS was frozen
which led to creating new transactions in ext4_release_quota. 

Most of the details are in the bug however I'd just like to add that
I'm completely new to quota code so the patch, although fixing the
issue, might be not be logically the right thing to do. So reviews and
suggestions are welcome. 

Also, I can only replicate this race on one of my machines reliably and
does not appear on others.  I've tested with with fstests -g quota and
don't see any new failures.

Ojaswin Mujoo (1):
  quota: flush quota_release_work upon quota writeback

 fs/quota/dquot.c | 2 ++
 1 file changed, 2 insertions(+)

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2.43.5