[Xen-devel] unregister_netdevice: Waiting for vif7.0 to become free

[Paul Wagland <xen+paul@xxxxxxxxxxxxxxxx>]

Hi all,

I was hoping that someone might be able to shed some light on what is 
happening here. I will outline my setup:

I have seven xen domUs, and one (duh!) dom0 all running a linux 
2.6.11.10 locally compiled version of Linux. If needed, I can attach 
the the configurations that I have used. Eth0 and Eth1 have both been 
assigned to dom0, as well as a created tap1 to hold the domU network. 
Each domU has 1 bridged interface onto tap1. Further, each domU has 
three LVM partitions as it's backing store onto the disk. I think that 
this is all of the relevant details, let me know if you want more :-) 
Oh, these linuxes were all built with the xen-testing source tarball 
from 2005-05-21.

Anyway, whenever I shutdown my 7th domU (the one with id=7) then I get 
the following error:

Message from syslogd@kruimel at Mon May 23 19:20:35 2005 ...
kruimel kernel: unregister_netdevice: waiting for vif7.0 to become free. Usage 
count = 1

At this point, my console locks up, although I can still ssh into dom0 
and the remaining domUs. Further, after this point no other xen 
instance can properly shut down. If I shut down any of the other domUs 
first, everything appears to be OK. Also, because none of the other 
domUs can terminate, I can no longer reboot the machine, as xendomains 
will not terminate.

I would ask this on -user, however, this is clearly an error of some 
form, and has led to a DOS for me, as I had tried to remotely reboot 
the machine... due to the lack of shutdown I had to physically hard 
reset the machine. (alt-sysrq sub) also works.

If I can provide any further information please let me know.

Cheers,
Paul

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