[Xen-users] AGAIN: unregister_netdevice: waiting for vif3.0 to become free. Usage count = 15

[Anton Khalikov <anton@xxxxxxxxxxx>]

Hello everyone

I'm back again with my problem: domUs become Zombies after shutdown with 
message "unregister_netdevice: waiting for vif3.0 to become free. Usage 
count =". I can't reboot dom0, can't restart affected domU because 
interface is locked and reboot process hangs forever.
The problem is still here altrough I use the latest xen 3.0.2-2 with 
kernel 2.6.16.13. My server is P-IV with HT enabled.
After long time of googling I've found a very interesting message 
related to this problem: 
http://permalink.gmane.org/gmane.comp.emulators.xen.devel/13607
Altrough it is related to kernel 2.6.12, my current kernel 
(net/bridge/br_if.c) seem to still contain this bug. At least in line 
461 (br_del_if() function):
       if (!p || p->br != br)
                return -EINVAL;
and Ryan Harper suggests to replace it with:
       if (!p || p->br != br || p->state == BR_STATE_DISABLED)
                return -EINVAL;
and remove "brctl delif" calls from xen's scripts.

More read about this discussion: 
http://comments.gmane.org/gmane.comp.emulators.xen.devel/13554
Could anyone provide me any info how to get rid of this damn problem ? 
At the moment every shutdown/reboot of any domU for me ends with sysrq 
reboot of the dom0 server :(
--
Best regards
Anton Khalikov

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