netdev - Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages

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Message-ID: <20120901082018.GA16762@electric-eye.fr.zoreil.com>
Date:	Sat, 1 Sep 2012 10:20:18 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	David Madore <david+ml@...ore.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages_nodemask+0x1d4/0x68c()

Hugh Dickins <hughd@...gle.com> :
> [ Cc'ing original mail to netdev as the problem may be recognized there ]
[...]
> Francois is right that a GFP_ATOMIC allocation from pskb_expand_head()
> is failing, which can easily happen, and cause your "failed to reallocate
> TX buffer" errors; but it's well worth looking up what's actually on
> lines 2108 and 2109 of mm/page_alloc.c in 3.2.27:
> 
> 	if (order >= MAX_ORDER) {
> 		WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));

You are right. The wifi Tx path error is not related.

I overlooked it was using SLUB btw.

> That was probably not a sane allocation request, it has gone out of range:
> maybe the skb header is even corrupted.  If you're lucky, it might be
> something that netdev will recognize as already fixed.

Afaics nothing related to mv643xx_eth.c, nor pskb_expand_head nor
ip6_forward, at least nothing trivially close. Eric may provide a
better answer.

-- 
Ueimor
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