Re: [uml-devel] Integer overflows in new AIO ubd driver

[Jeff D. <jd...@ad...>]

On Sun, Mar 26, 2006 at 08:49:25PM +0200, Gerd Stolpmann wrote:
> I recently tried to benchmark the new AIO-based ubd driver (including
> O_DIRECT), and ran into serious problems with filesystems > 4GB. I think
> I found the problem; two overflows in ubd_kern.c (see patch).

The first bit looks reasonable.  I would change start to an unsigned
long long instead of casting, though.

> I also experienced (hard) lockups when doing lots of I/O. But this seems
> to be unrelated to this problem (but who knows).

What was your workload?

				Jeff