XFS kernel BUG at fs/buffer.c:470! with 2.6.28.4

[Christoph Hellwig]

On Sat, Feb 07, 2009 at 02:06:13PM +0100, Alessandro Bono wrote:
> Feb  7 12:43:12 champagne kernel: [ 5828.167041] ------------[ cut
> here ]------------
> Feb  7 12:43:12 champagne kernel: [ 5828.167048] kernel BUG at
> fs/buffer.c:470!

Per
http://git.kernel.org/?p=linux/kernel/git/hpa/linux-2.6-allstable.git;a=blob;f=fs/buffer.c;h=665d446b25bc034241ef54c3c6b1d239c0ccf0f9;hb=d5b562330ec766292a3ac54ae5e0673610bd5b3d

line 470 in fs/buffer.c of 2.6.28.4 has a comment and no actual code.

What additional patches do you have applied?