On Sat, 29 Jul 2006 16:42:04 +0100
Rodrigo Ventura <[email protected]> wrote:
>
> I'm using kernel 2.6.16 (-gentoo-r13 actually). A bridge iface br0 is setup
> using eth1 and eth0.1 (VLAN) as slaves. To bring br0, what I do is to remove
> the slaves from the bridge first, "ip link set dev br0 down" next, followed
> by the brctl command to remove the bridge. What happens is that it seems it
> tryes to destroy the bridge iface, and then hangs, with dmesg complaining,
> periodically, about once a second, something like:
>
> unregister_netdevice: waiting for br0 to become free. Usage count = 1
> unregister_netdevice: waiting for br0 to become free. Usage count = 1
> unregister_netdevice: waiting for br0 to become free. Usage count = 1
> ...
>
> I say it partially hangs because commands like ifconfig hang (ps state=Disk
> busy)...
> To reboot the machine, a HARD reset is required, since, the shutdown process
> hangs...
>
Some broken protocol in the kernel, incremented a refcount but forgot
to cleanup when notified on device removal.
There was a bug in the VLAN code that did that, not sure which version
it was fixed in.
Do you have IPV6 installed (as a module)?
In some kernel versions, IPV6 has a problem with device ref counting, and
leaves a dangling reference.
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