netdev - Re: [PATCH] nf_conntrack_timestamp: Fix BUG

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Date:	Fri, 20 Dec 2013 14:59:35 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Helmut Schaa <helmut.schaa@...glemail.com>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	kaber@...sh.net, kadlec@...ckhole.kfki.hu
Subject: Re: [PATCH] nf_conntrack_timestamp: Fix BUG_ON after netns deletion

On Fri, Dec 20, 2013 at 02:41:54PM +0100, Helmut Schaa wrote:
> When having nf_conntrack_timestamp enabled deleting a netns can lead
> to the following BUG being triggered:
> 
> [63836.660000] Kernel bug detected[#1]:
> [63836.660000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.10.18 #14
> [63836.660000] task: 802d9420 ti: 802d2000 task.ti: 802d2000
> [63836.660000] $ 0   : 00000000 00000000 00000000 00000000
> [63836.660000] $ 4   : 00000001 00000004 00000020 00000020
> [63836.660000] $ 8   : 00000000 80064910 00000000 00000000
> [63836.660000] $12   : 0bff0002 00000001 00000000 0a0a0abe
> [63836.660000] $16   : 802e70a0 85f29d80 00000000 00000004
> [63836.660000] $20   : 85fb62a0 00000002 802d3bc0 85fb62a0
> [63836.660000] $24   : 00000000 87138110
> [63836.660000] $28   : 802d2000 802d3b40 00000014 871327cc
> [63836.660000] Hi    : 000005ff
> [63836.660000] Lo    : f2edd000
> [63836.660000] epc   : 87138794 __nf_ct_ext_add_length+0xe8/0x1ec [nf_conntrack]
> [63836.660000]     Not tainted
> [63836.660000] ra    : 871327cc nf_conntrack_in+0x31c/0x7b8 [nf_conntrack]
> [63836.660000] Status: 1100d403 KERNEL EXL IE
> [63836.660000] Cause : 00800034
> [63836.660000] PrId  : 0001974c (MIPS 74Kc)
> [63836.660000] Modules linked in: ath9k ath9k_common pppoe ppp_async iptable_nat ath9k_hw ath pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv4 mac80211 ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_quota xt_policy xt_pkttype xt_owner xt_nat xt_multiport xt_mark xh
> [63836.660000] Process swapper (pid: 0, threadinfo=802d2000, task=802d9420, tls=00000000)
> [63836.660000] Stack : 802e70a0 871323d4 00000005 87080234 802e70a0 86d2a840 00000000 00000000
> [63836.660000] Call Trace:
> [63836.660000] [<87138794>] __nf_ct_ext_add_length+0xe8/0x1ec [nf_conntrack]
> [63836.660000] [<871327cc>] nf_conntrack_in+0x31c/0x7b8 [nf_conntrack]
> [63836.660000] [<801ff63c>] nf_iterate+0x90/0xec
> [63836.660000] [<801ff730>] nf_hook_slow+0x98/0x164
> [63836.660000] [<80205968>] ip_rcv+0x3e8/0x40c
> [63836.660000] [<801d9754>] __netif_receive_skb_core+0x624/0x6a4
> [63836.660000] [<801da124>] process_backlog+0xa4/0x16c
> [63836.660000] [<801d9bb4>] net_rx_action+0x10c/0x1e0
> [63836.660000] [<8007c5a4>] __do_softirq+0xd0/0x1bc
> [63836.660000] [<8007c730>] do_softirq+0x48/0x68
> [63836.660000] [<8007c964>] irq_exit+0x54/0x70
> [63836.660000] [<80060830>] ret_from_irq+0x0/0x4
> [63836.660000] [<8006a9f8>] r4k_wait_irqoff+0x18/0x1c
> [63836.660000] [<8009cfb8>] cpu_startup_entry+0xa4/0x104
> [63836.660000] [<802eb918>] start_kernel+0x394/0x3ac
> [63836.660000]
> [63836.660000]
> Code: 00821021  8c420000  2c440001 <00040336> 90440011  92350010  90560010  2485ffff  02a5a821
> [63837.040000] ---[ end trace ebf660c3ce3b55e7 ]---
> [63837.050000] Kernel panic - not syncing: Fatal exception in interrupt
> [63837.050000] Rebooting in 3 seconds..
> 
> Fix this by not unregistering the conntrack extension in the per-netns
> cleanup code.

Applied, thanks.
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