netdev - Re: WARNING: at net/core/skbuff.c:154 with tcpdump and ipsec

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Message-ID: <20090213192448.GA2929@ami.dom.local>
Date:	Fri, 13 Feb 2009 20:24:48 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
Cc:	Krzysztof Oledzki <ole@....pl>,
	Marco Berizzi <pupilla@...mail.com>, netdev@...r.kernel.org
Subject: Re: WARNING: at net/core/skbuff.c:154 with tcpdump and ipsec

On Fri, Feb 13, 2009 at 01:56:01PM -0500, Vlad Yasevich wrote:
...
> I did notice that pskb_expand_head() doesn't change the skb->truesize even
> though it could grow the skb.  I saw this problem with tcpdump while
> experimenting with some SCTP code.
> 
> This is not to say that it is the problem in this case, but it's one of
> them that I've seen.

Yes, I've read Herbert Xu's message pointing especially to
xfrm_state_check_space(). So I would like to make sure if there is no
other reason it triggers in packet_recvmsg() on these several reports.

If af_packet code is OK, I guess we could update truesize for it:
there is no reason to warn here about bugs from other, well known
places.

Jarek P.
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