netdev - Re: [PATCH net] net: sctp: use MAX_HEADER for headroom reserve in output path

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Date:	Tue, 09 Dec 2014 13:24:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	robert@...ecki.net
Subject: Re: [PATCH net] net: sctp: use MAX_HEADER for headroom reserve in
 output path

From: Daniel Borkmann <dborkman@...hat.com>
Date: Wed,  3 Dec 2014 12:13:58 +0100

> To accomodate for enough headroom for tunnels, use MAX_HEADER instead
> of LL_MAX_HEADER. Robert reported that he has hit after roughly 40hrs
> of trinity an skb_under_panic() via SCTP output path (see reference).
> I couldn't reproduce it from here, but not using MAX_HEADER as elsewhere
> in other protocols might be one possible cause for this.
> 
> In any case, it looks like accounting on chunks themself seems to look
> good as the skb already passed the SCTP output path and did not hit
> any skb_over_panic(). Given tunneling was enabled in his .config, the
> headroom would have been expanded by MAX_HEADER in this case.
> 
> Reported-by: Robert Święcki <robert@...ecki.net>
> Reference: https://lkml.org/lkml/2014/12/1/507
> Fixes: 594ccc14dfe4d ("[SCTP] Replace incorrect use of dev_alloc_skb with alloc_skb in sctp_packet_transmit().")
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied and queued up for -stable, thanks.
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