linux-kernel - Re: [bug, netconsole, SLUB] BUG skbuff_head

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Message-Id: <20080721.163349.113841731.davem@davemloft.net>
Date:	Mon, 21 Jul 2008 16:33:49 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johnpol@....mipt.ru
Cc:	mingo@...e.hu, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	vegard.nossum@...il.com, rjw@...k.pl, cl@...ux-foundation.org,
	auke-jan.h.kok@...el.com
Subject: Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison
 overwritten

From: Evgeniy Polyakov <johnpol@....mipt.ru>
Date: Tue, 22 Jul 2008 01:24:48 +0400

> On Mon, Jul 21, 2008 at 09:21:38PM +0200, Ingo Molnar (mingo@...e.hu) wrote:
> > So it's now a strong likelyhood that this crash is a combination of 
> > e1000e+netconsole.
> 
> e1000_clean_tx_irq() call looks particulary suspicious: it is called
> without adapter->tx_queue_lock in poll controller (netconsole callback)
> and with that lock in NAPI handler.
> 
> Can you check kind of this patch:

The call even seems pointless, since the caller will call
->poll() (which is e1000_clean) as the very next action,
and that will invoke e1000_clean_tx_irq() properly.

I would just delete this call from e1000_netpoll() entirely.
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