From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastien ESTIENNE <sebest@ovibes.net>
Subject: Re: kernel 2.6.7 -> page allocation failure. order:1, mode:0x20
	(netfilter?)
Date: Tue, 20 Jul 2004 11:06:51 +0200
Sender: linux-kernel-owner@vger.kernel.org
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	 <20040720024741.GF27487@obroa-skai.de.gnumonks.org>
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To: Harald Welte <laforge@netfilter.org>
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List-Id: netdev.vger.kernel.org

Le mar 20/07/2004 =C3=A0 04:47, Harald Welte a =C3=A9crit :
> On Mon, Jul 19, 2004 at 11:27:26AM +0200, Sebastien ESTIENNE wrote:
> > Hello,
> > i have some "swapper: page allocation failure. order:1, mode:0x20"
> > followed by kernel message,
> >=20
> > the hardware is a dell poweredge 1750
> > the kernel is a 2.6.7 vanilla
> >=20
> > here for a dmesg
> > http://213.41.75.25/kernel/dmesg.txt
> the chunk below seems like a standard code path for a locally-generat=
ed
> outgoing packet:
>=20
> > [<c028ac94>] skb_checksum_help+0x52/0x136
> > [<e094fb79>] ip_nat_fn+0x269/0x27a [iptable_nat]
> > [<e094fcb3>] ip_nat_local_fn+0x7b/0xaa [iptable_nat]
> > [<c028708e>] tcp_sendmsg+0x509/0x10f7
> > [<c0121872>] tasklet_action+0x65/0xae
> > [<c01065da>] apic_timer_interrupt+0x1a/0x20
> > [<c02ad977>] dst_output+0x0/0x29
> > [<c028708e>] inet_sendmsg+0x4d/0x59
> > [<c026498f>] dst_output+0x0/0x29
> > [<c0276a40>] sock_aio_write+0xbd/0xdd
> > [<c015902c>] do_sync_write+0x8b/0xb7
> > [<c01da1ac>] nf_iterate+0x71/0xa2
> > [<c028708e>] copy_from_user+0x42/0x6e
> > [<c0159140>] vfs_write+0xe8/0x119
> > [<c0159216>] sys_write+0x42/0x63
> > [<c0105beb>] syscall_call+0x7/0xb
>=20
> =20
> what's worrying me is the part above... how would skb_checksum_help
> directly end up in copy_from_user()?
>=20
> > swapper: page allocation failure. order:1, mode:0x20
> > [<c013d770>] __alloc_pages+0x2da/0x34a
> > [<c013d805>] __get_free_pages+0x25/0x3f
> > [<c0140e28>] kmem_getpages+0x2b/0xdc
> > [<c0141bfc>] kfree_skbmem+0x24/0x2c
> > [<c0141c5d>] cache_grow+0xe5/0x2a4
> > [<c0141f8a>] cache_grow+0x146/0x2a4
> > [<c0295917>] cache_alloc_refill+0x1cf/0x29f
> > [<c014262a>] __kmalloc+0x85/0x8c
> > [<c02681f1>] tcp_transmit_skb+0x411/0x68a
> > [<c0296621>] alloc_skb+0x47/0xe0
> > [<c026875e>] tcp_write_xmit+0x16d/0x2d6
> > [<c01da1ac>] skb_copy+0x33/0xde
> > [<c026ca5b>] copy_from_user+0x42/0x6e
>=20
> Does anybody have a clue what's going on?
I was running apache bench v2 on localhost
And Shorewall firewall script is installed on it (version 2.0.4)
iptables version 2.0.4
hope it can help