netdev - Re: q == &noop_qdisc warning from 802.11 code

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Message-Id: <1216824786.13587.6.camel@johannes.berg>
Date:	Wed, 23 Jul 2008 16:53:05 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Breno Leitao <leitao@...ux.vnet.ibm.com>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Michael Wu <flamingice@...rmilk.net>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: q == &noop_qdisc warning from 802.11 code


> I also hit a bug related to noop_qdisc running the net-next kernel. 
> I hit this bug every time I run "ifconfig eth0 mtu 9000; ifconfg eth0 1500" for any
> interface (tested against s2io and e1000) that is up, otherwise the bug isn't
> reproducible.
> 
> The bug dumps the following calltrace: 
> 
> [root@...dolphins net-next-2.6]# ifconfig eth0  mtu 9000; ifconfig eth0 mtu 1500
> ------------[ cut here ]------------
> kernel BUG at net/core/dev.c:1328!

> void __netif_schedule(struct Qdisc *q)
> {
>         BUG_ON(q == &noop_qdisc);
> 
> So, somehow we're reaching __netif_schedule() using a noop_qdisc. 

Yeah, I'm looking into it. Just removing the netif_wake calls in mlme.c
might work.

johannes

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