I'm guessing that the aoe driver is holding a reference to the br0 (or whatever) network interface, just as it would do to eth0 (or whatever), which means you cannot destroy br0. That's safe, but it just means you have to stop using resources in a sane order. There is probably an init script that is attempting to destroy the br0 (or whatever) before aoe has released it.
If you arrange for a shutdown script to undo all the AoE-related stuff early in the shutdown process, you'll do some of these in-order steps:
* unmount AoE-backed filesystems
* deactivate AoE-backed logical volumes
* stop AoE-backed software RAID devices
* either
- rmmod aoe, or
- aoe-interfaces bogus; aoe-flush -a; sleep 1
With either of the last two steps releasing the reference aoe is holding on the br0 interface. I mention the second option just to be specific. The first one is probably easier.
Yacine chimed in here. Alyseo has some great aoe-related init scripts that you can use as a template for your own script.
I'm planning to help the distros to handle the aoe-related startup/shutdown issues soon, but anybody is welcome to beat me to it or to collaborate with me.
On Nov 24, 2012, at 12:21 PM, Nicolas Jungers wrote:
> I found a bug in the interaction of the AoE driver and the linux bridge.
>
> On a stock Ubuntu 12.04 with standard bridge-utils and A0E version 81,
> the machine cannot shutdown or reboot.
>
> The bridge stays stuck at the close stage with all the AoE connection
> still open.
>
> I didn't test that on CentOS yet, so I'm unsure if it's a distribution
> bug or an AoE one.
>
> Any idea?
>
> Regards,
> Nicolas
>
>
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