netdev - Re: [PATCH] ipvs: fix oops on NAT reply in br

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Date:	Tue, 10 Jul 2012 17:51:45 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Lin Ming <mlin@...pku.edu.cn>
Cc:	Julian Anastasov <ja@....bg>,
	Massimo Cetra <ctrix+debianbugs@...ynet.it>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] ipvs: fix oops on NAT reply in br_nf context

On Sat, Jul 07, 2012 at 06:26:10PM +0800, Lin Ming wrote:
> IPVS should not reset skb->nf_bridge in FORWARD hook
> by calling nf_reset for NAT replies. It triggers oops in
> br_nf_forward_finish.
> 
> [  579.781508] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
> [  579.781669] IP: [<ffffffff817b1ca5>] br_nf_forward_finish+0x58/0x112
> [  579.781792] PGD 218f9067 PUD 0 
> [  579.781865] Oops: 0000 [#1] SMP 
> [  579.781945] CPU 0 
> [  579.781983] Modules linked in:
> [  579.782047] 
> [  579.782080] 
> [  579.782114] Pid: 4644, comm: qemu Tainted: G        W    3.5.0-rc5-00006-g95e69f9 #282 Hewlett-Packard  /30E8
> [  579.782300] RIP: 0010:[<ffffffff817b1ca5>]  [<ffffffff817b1ca5>] br_nf_forward_finish+0x58/0x112
> [  579.782455] RSP: 0018:ffff88007b003a98  EFLAGS: 00010287
> [  579.782541] RAX: 0000000000000008 RBX: ffff8800762ead00 RCX: 000000000001670a
> [  579.782653] RDX: 0000000000000000 RSI: 000000000000000a RDI: ffff8800762ead00
> [  579.782845] RBP: ffff88007b003ac8 R08: 0000000000016630 R09: ffff88007b003a90
> [  579.782957] R10: ffff88007b0038e8 R11: ffff88002da37540 R12: ffff88002da01a02
> [  579.783066] R13: ffff88002da01a80 R14: ffff88002d83c000 R15: ffff88002d82a000
> [  579.783177] FS:  0000000000000000(0000) GS:ffff88007b000000(0063) knlGS:00000000f62d1b70
> [  579.783306] CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
> [  579.783395] CR2: 0000000000000004 CR3: 00000000218fe000 CR4: 00000000000027f0
> [  579.783505] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [  579.783684] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [  579.783795] Process qemu (pid: 4644, threadinfo ffff880021b20000, task ffff880021aba760)
> [  579.783919] Stack:
> [  579.783959]  ffff88007693cedc ffff8800762ead00 ffff88002da01a02 ffff8800762ead00
> [  579.784110]  ffff88002da01a02 ffff88002da01a80 ffff88007b003b18 ffffffff817b26c7
> [  579.784260]  ffff880080000000 ffffffff81ef59f0 ffff8800762ead00 ffffffff81ef58b0
> [  579.784477] Call Trace:
> [  579.784523]  <IRQ> 
> [  579.784562] 
> [  579.784603]  [<ffffffff817b26c7>] br_nf_forward_ip+0x275/0x2c8
> [  579.784707]  [<ffffffff81704b58>] nf_iterate+0x47/0x7d
> [  579.784797]  [<ffffffff817ac32e>] ? br_dev_queue_push_xmit+0xae/0xae
> [  579.784906]  [<ffffffff81704bfb>] nf_hook_slow+0x6d/0x102
> [  579.784995]  [<ffffffff817ac32e>] ? br_dev_queue_push_xmit+0xae/0xae
> [  579.785175]  [<ffffffff8187fa95>] ? _raw_write_unlock_bh+0x19/0x1b
> [  579.785179]  [<ffffffff817ac417>] __br_forward+0x97/0xa2
> [  579.785179]  [<ffffffff817ad366>] br_handle_frame_finish+0x1a6/0x257
> [  579.785179]  [<ffffffff817b2386>] br_nf_pre_routing_finish+0x26d/0x2cb
> [  579.785179]  [<ffffffff817b2cf0>] br_nf_pre_routing+0x55d/0x5c1
> [  579.785179]  [<ffffffff81704b58>] nf_iterate+0x47/0x7d
> [  579.785179]  [<ffffffff817ad1c0>] ? br_handle_local_finish+0x44/0x44
> [  579.785179]  [<ffffffff81704bfb>] nf_hook_slow+0x6d/0x102
> [  579.785179]  [<ffffffff817ad1c0>] ? br_handle_local_finish+0x44/0x44
> [  579.785179]  [<ffffffff81551525>] ? sky2_poll+0xb35/0xb54
> [  579.785179]  [<ffffffff817ad62a>] br_handle_frame+0x213/0x229
> [  579.785179]  [<ffffffff817ad417>] ? br_handle_frame_finish+0x257/0x257
> [  579.785179]  [<ffffffff816e3b47>] __netif_receive_skb+0x2b4/0x3f1
> [  579.785179]  [<ffffffff816e69fc>] process_backlog+0x99/0x1e2
> [  579.785179]  [<ffffffff816e6800>] net_rx_action+0xdf/0x242
> [  579.785179]  [<ffffffff8107e8a8>] __do_softirq+0xc1/0x1e0
> [  579.785179]  [<ffffffff8135a5ba>] ? trace_hardirqs_off_thunk+0x3a/0x6c
> [  579.785179]  [<ffffffff8188812c>] call_softirq+0x1c/0x30
> 
> The steps to reproduce as follow,
> 
> 1. On Host1, setup brige br0(192.168.1.106)
> 2. Boot a kvm guest(192.168.1.105) on Host1 and start httpd
> 3. Start IPVS service on Host1
>    ipvsadm -A -t 192.168.1.106:80 -s rr
>    ipvsadm -a -t 192.168.1.106:80 -r 192.168.1.105:80 -m
> 4. Run apache benchmark on Host2(192.168.1.101)
>    ab -n 1000 http://192.168.1.106/
> 
> ip_vs_reply4
>   ip_vs_out
>     handle_response
>       ip_vs_notrack
>         nf_reset()
>         {
>           skb->nf_bridge = NULL;
>         }
> 
> Actually, IPVS wants in this case just to replace nfct
> with untracked version. So replace the nf_reset(skb) call
> in ip_vs_notrack() with a nf_conntrack_put(skb->nfct) call.
> 
> Signed-off-by: Lin Ming <mlin@...pku.edu.cn>
> Signed-off-by: Julian Anastasov <ja@....bg>

Actually, I'll queue up this version for 3.5 rather than the previous one
as it has a better title.

As per my previous comment (repeated here for reference) it seems to me
that this problem has been present since 2.6.37 and thus is stable material.

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