Am 16.06.2014 um 20:51 schrieb Cong Wang [off-list ref]:

On Mon, Jun 16, 2014 at 11:41 AM, Stefan Priebe - Profihost AG
[off-list ref] wrote:

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Am 16.06.2014 um 20:05 schrieb Cong Wang [off-list ref]:

On Mon, Jun 16, 2014 at 5:51 AM, Stefan Priebe - Profihost AG
[off-list ref] wrote:

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Hi,

i'm using a vanilla 3.10.43 kernel and netconsole on top of a bridge.

netconsole is used with vmbr0 (bridge) which is on top of bond0.

If i want to add another bridge to vmbr0 is fails as long as netconsole
is in use.

# brctl addif vmbr0 fwpr2004p0
can't add fwpr2004p0 to bridge vmbr0: Unknown error 524

Kernel output:
netpoll: (null): fwpr2004p0 doesn't support polling, aborting

If i do rmmod netconsole - everything is working fine again.

This is expected, you can't add an interface which doesn't support
netpoll to a bridge which is running netpoll.

Thanks, so i can't use netconsole at a bridge used for vms?

You can, but you need to make sure all the devices under
this bridge support netpoll. Not considering mac learning,
bridge just broadcasts all the packets to its ports, if one of them
doesn't support netpoll, how could it work?

Ok i was trying to add a veth device so this is the problematic device.

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You should stop netpoll before adding it.

How to do that? What disadvantage does this have?

If you are using a redhat distro, run `service netconsole stop`.

Or you can disable it via configfs, check
Documentation/networking/netconsole.txt.

Ok but this means disabling netconsole nothing I want.

Stefan