linux-ext4 - [Bug 29402] kernel panics while running ffsb scalability workloads on 2.6.38-rc1 through -rc5

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Message-Id: <201102250325.p1P3PlaU030888@demeter2.kernel.org>
Date:	Fri, 25 Feb 2011 03:25:47 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 29402] kernel panics while running ffsb scalability workloads
 on 2.6.38-rc1 through -rc5

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





--- Comment #8 from Eric Whitney <eric.whitney@...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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