linux-kernel - Re: PROBLEM: System call 'sendmsg' of process ospfd (quagga) causes kernel oops

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Message-ID: <1319010739.18562.6.camel@edumazet-laptop>
Date:	Wed, 19 Oct 2011 09:52:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.hengli.com.au, evonlanthen@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	timo.teras@....fi
Subject: Re: PROBLEM: System call 'sendmsg' of process ospfd (quagga) causes
 kernel oops

Le mercredi 19 octobre 2011 à 03:30 -0400, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 19 Oct 2011 09:18:33 +0200
> 
> > Seems fine (Maybe do the +15 in caller site ?), but we also have other
> > problematic cases, using alloc_skb() only...
> 
> Ok, which ones operate over these problematic GRE tunnels?
> 

I was more thinking of general idea to allow any device to change its
needed headroom.

For GRE tunnels, I dont think IPv6 fragmentation could be relevant,
but maybe IGMP could trigger a problem ?



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