linux-kernel - Re: [Bug #14252] WARNING: at include/linux/skbuff.h:1382 w/ e1000

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Message-Id: <20091012.034919.98011643.davem@davemloft.net>
Date:	Mon, 12 Oct 2009 03:49:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rjw@...k.pl
Cc:	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	skraw@...net.com, netdev@...r.kernel.org,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	peter.p.waskiewicz.jr@...el.com
Subject: Re: [Bug #14252] WARNING: at include/linux/skbuff.h:1382 w/ e1000

From: "Rafael J. Wysocki" <rjw@...k.pl>
Date: Mon, 12 Oct 2009 01:01:06 +0200 (CEST)

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.30 and 2.6.31.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.30 and 2.6.31.  Please verify if it still should
> be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=14252
> Subject		: WARNING: at include/linux/skbuff.h:1382 w/ e1000
> Submitter	: Stephan von Krawczynski <skraw@...net.com>
> Date		: 2009-09-20 11:26 (22 days old)
> References	: http://marc.info/?l=linux-kernel&m=125344599006033&w=4

Hmmm... e1000 calls skb_trim() on both jumbo and non-jumbo ring
buffers which get recycled.

At least for the Jumbo case, that's illegal as you cannot call
skb_trim() on an SKB with paged data.

But this assertion is triggering for the non-jumbo ring where
only linear packets should be present as far as I can tell.

Some Intel folks need to take a look, CC:'d, and people need
to CC: their networking bug reports to netdev@...r.kernel.org
so that the proper folks see it.

Thanks.

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