linux-kernel - Re: netconsole breaks netpoll on bridge

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Message-ID: <CAHA+R7OrT+x_jvDeqKgFc=ndebhB6qwecJBcT5y0ZAA+hBCJ3Q@mail.gmail.com>
Date:	Mon, 16 Jun 2014 11:05:57 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	David Miller <davem@...emloft.net>,
	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

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.

You should stop netpoll before adding it.
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