Why does xfsdump encounter "WARNING: could not get list of non-root attributes for nondir ino nnnn: Cannot allocate memory (12)"?

[Christoph Hellwig]

On Wed, Jan 11, 2012 at 09:03:16PM +1100, Dave Chinner wrote:
> Sounds like a generic kvmalloc()/kvfree() call pair is the answer
> then. i.e. if kmalloc fails, then use vmalloc()...

If my memory serves me right that's been discussed and rejected a few
times before.