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

--- Comment #8 from Eric Whitney <eric.whitney@hp.com>  2011-02-25 03:25:46 ---

(sorry - network hiccup - starting from the top again)

bio_batch_end_io()                  blkdev_issue_zeroout()
  ...                                 wait_for_completion(&wait)
  complete(bb->wait)                  ...
  ...                                 issued != atomic_read(&bb.done)
  ...                                 wait_for_completion(&wait)
  atomic_inc(&bb->done)               ...
                                      <wedge while waiting for the completion
                                       that won't be coming>

At any rate, that's what I think is happening - we're missing the last "inc"
and then we're not getting the completion notification we need to finish in
blkdev_issue_zeroout().

I'll attach the first hung task trace from the console for reference.

Thanks!
Eric

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