On Fri, Feb 12, 2010 at 01:51:12PM +0900, Jun'ichi Nomura wrote:

(02/12/10 12:14), Andrew Morton wrote:

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On Thu, 11 Feb 2010 21:44:17 -0500 Valdis.Kletnieks@vt.edu wrote:

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On Wed, 10 Feb 2010 16:17:41 PST, akpm@linux-foundation.org said:

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The mm-of-the-moment snapshot 2010-02-10-16-17 has been uploaded to

   http://userweb.kernel.org/~akpm/mmotm/

Hit this at shutdown. ext4 filesystems.  Brought it up to single-user
mode, then 'shutdown -h now'.

[   58.311786] ------------[ cut here ]------------
[   58.312261] kernel BUG at fs/dcache.c:677!

...

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Yeah, Sachin reported that against linux-next too (I think - need to
check the exact line numbers):
http://permalink.gmane.org/gmane.linux.file-systems/38148

It seems to have been met with shrugs thus far.

According to the Sachin's report:

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While running hackbench against today's next-20100208 (9056d31..)
on a s390 box, came across following BUG.

...

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Did not observe this with next-20100205. Also there doesn't seem to be
any patches applied to this code after the last release. So not
sure what could have caused this. Corresponding code is :

So the bug seems introduced between next-20100205 and next-20100208.

Isn't this change missing the equivalent of "dput(old)"?

Argh...  Nice catch, and yes, it is.