Re: Freezing Windows 2008 x64bit guest

[Gleb Natapov <gleb@redhat.com>]

On Thu, Jul 15, 2010 at 03:19:44PM +0200, Christoph Adomeit wrote:
> Hi,
> 
> we are running several kvm servers with kvm 0.12.4 and kernel 2.6.32
> (actually we run proxmox ve)
> 
> These proxmox servers are running all kinds of vms rock-solid, be it
> linux or windows 32 platforms.
> 
> But one Windows 2008 64 Bit Server Standard is freezing regularly.
> This happens sometimes 3 times a day, sometimes it takes 2 days
> until freeze. The Windows Machine is a clean fresh install.
> 
> By Freezing I mean that the Machine console still shows the 
> windows logo but does not accept any keystroke and does not answer
> to ping or rdp or whatever. The virtual cpu-load is then shown
> as 100% (by proxmox).
> 
> We tried several combinations of ide or virtio, several virtual network cards (intel and realtek) and single-cpu vs multi cpu. The Problem persists.
> 
> The Windows Machine is a quite fresh install but runs exchange and 10 rdp sessions.
> 
> We are experienced linux-admins but we dont find any hints on the kvm servers what might be the problem, no syslogs,dmesgs, nothing. Also there are no 
> dumps on the windows guest.
> 
> Do you have any hints what might be the problem and what we could do to debug the problem and to get more information of the root cause ?
> 
When hang occurs ensure that problematic vm is the only on on the server and run
kvm_stat. Send output here. Also do the following:

# mount -t debugfs debugfs /sys/kernel/debug
# echo kvm > /sys/kernel/debug/tracing/set_event
# sleep 1
# cat /sys/kernel/debug/tracing/trace > /tmp/trace

Send /tmp/trace here too, but it may be huge, so send only last 1000
lines.

--
			Gleb.