https://bugzilla.kernel.org/show_bug.cgi?id=29402

--- Comment #7 from Eric Whitney <eric.whitney@hp.com>  2011-02-25 03:08:48 ---

Hi Lukas:

When running the large_file_creates_threads=192 workload with this patch on an
-rc5 kernel, I consistently saw a new failure. The ext4lazyinit thread stalled
(tripping hung task detector) along with the flusher and journal threads, and
ffsb then ceased to make forward progress.

I think we're just seeing a new variant of the original race, where
bio_batch_end_io() sometimes never gets the value of &bb->done it's waiting
for:

bio_batch_end_io()
  ...
complete(bb->wait)

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