[Fedora-xen] restore failed

[Augusto Castelan Carlson]

Hi!

I have Xen (fedora 7 with xen 3.1.0) running with 2 guests (both
fedora 7). At night I save both guest and mount their partitions to do
a backup. Then I restore the saved machines. Everything appears to be
working fine, but I had some problems with restore this weekend. When
I arrived to work, one of the guest was not running properly.
I tried to shutdown the machine and start it again, but got the
following error when trying to start:

virsh # start virtual_machine_name
libvir: Xen Daemon error : POST operation failed: (xend.err "'uname'")
error: Failed to start domain virtual_machine_name

Seeking for any problem in log files I found some errors:

[2007-09-07 09:14:16 2285] CRITICAL (SrvDaemon:231) Xend died due to
signal 11!  Restarting it.
:
:
[2007-09-07 09:14:18 2557] DEBUG (XendDomainInfo:1463)
XendDomainInfo.constructDomain
[2007-09-07 09:14:18 2557] DEBUG (balloon:113) Balloon: 64248 KiB
free; need 2048; done.
[2007-09-07 09:14:18 2557] ERROR (XendDomainInfo:434) VM resume failed
:
:

I can attach my full log if needed. I did a restore with a previous
saved session and the guest is running ok now.

What can be done so that those errors do not occur any more?

Thanks in advance,
-- 
Augusto Castelan Carlson