linux-kernel - Re: netconsole breaks netpoll on bridge

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Date:	Mon, 16 Jun 2014 20:41:38 +0200
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Cong Wang <cwang@...pensource.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	David Miller <davem@...emloft.net>,
	"bridge@...ts.linux-foundation.org" 
	<bridge@...ts.linux-foundation.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: netconsole breaks netpoll on bridge


> Am 16.06.2014 um 20:05 schrieb Cong Wang <cwang@...pensource.com>:
> 
> On Mon, Jun 16, 2014 at 5:51 AM, Stefan Priebe - Profihost AG
> <s.priebe@...fihost.ag> wrote:
>> 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 should stop netpoll before adding it.

How to do that? What disadvantage does this have?

Thanks!

Stefan

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