Xen devel - Jul 2011 - unregister_netdevice:waiting for vifXXX.0 to become free. Usage count =1

Hi,

This message is showed in /var/log/messages on dom0 when I am trying to shutdown
a domu. Sometime it can shutdown eventually, sometime it hang forever.
Sometimes, it can shutdown smoothly even without this message. i.e., We can not
stably reproduce this problem but we encounter this problem several times in
total.

I enable IPv6 on both dom0 and domu. I google it a little, it seems related to
ipv6. We didn''t have this  problem in ipv4-only context.

We used xen4.1.0 + xenified kernel2.6.18.

Anyone can help identify and resolve this problem?

Thanks in advance.

HUAXIANG FAN
Software Engineer II

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