linux-ext4 - Re: [PATCH] xfstests-bld: exclude ext4 defrag tests from unsupported configurations

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Message-ID: <20150615011433.GA15793@thunk.org>
Date:	Sun, 14 Jun 2015 21:14:33 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Eric Whitney <enwlinux@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] xfstests-bld: exclude ext4 defrag tests from unsupported
 configurations

On Thu, Jun 11, 2015 at 08:24:21PM -0400, Eric Whitney wrote:
> Spoke too soon - hit what looks like the old problem on ARM running 4.1-rc7
> on the ninth trial run.  Various components of the test are left in the 'D'
> state after a familiar oops - kernel BUG at fs/jbd2/transaction.c:2150 while
> truncating.
> 
> I'll see if I can still get the problem to appear on x86_64.

I was able to reproduce this on x86_64, after running a kernel build
on the host as an antogonist.  I'm guessing that the race window is
pretty narrow, so that's why it wasn't triggering for me easily until
I had some additional I/O traffic to slow things down further.

After some investigation, it looks like this bug has been around since
2008(!).  I'll send out a fix.

						- Ted
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