On Tue, Sep 18, 2007 at 02:58:23AM -0600, John R. Shannon wrote:
> Since switching a server to 3.1 I've been experiencing infrequent hangs 
> of various domUs. In a recent one, the console of a non-responsive domU 
> showed:
> 
> xbd0: grant still used by backend
> 
> dom0 and domU are running NetBSD 4.99.30 on a Pentium 4 platform.

When you say "hang", can you give more details ? Is it a network or
disk hang, is the console still alive ? Can you enter ddb ?

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--