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

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Message-Id: <201102250308.p1P38oNO009333@demeter2.kernel.org>
Date:	Fri, 25 Feb 2011 03:08:50 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 #7 from Eric Whitney <eric.whitney@...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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