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Date: Fri, 15 Apr 2011 17:18:45 +0100 From: Simon Arlott <simon@...e.lp0.eu> To: Eric Dumazet <eric.dumazet@...il.com> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>, Netfilter Development Mailinglist <netfilter-devel@...r.kernel.org> Subject: Re: BUG: unable to handle kernel NULL pointer dereference at 000002c0 / IP: [<c04c70f2>] in6_dev_finish_destroy+0x35/0x8c On 15/04/11 14:24, Eric Dumazet wrote: > Hmm.. a more complete patch : > > diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c > index 0857272..6f0bed0 100644 I applied the patch by recompiling and then reloading the nf_conntrack_ipv6 module (temporarily flushing and then restoring all ip6tables rules). Then this happened 10 minutes later: [33876.950100] BUG: unable to handle kernel NULL pointer dereference at 00000014 [33876.951060] IP: [<f9b012bb>] nf_ct_frag6_gather+0x864/0x881 [nf_conntrack_ipv6] [33876.951060] *pdpt = 0000000033491001 *pde = 0000000000000000 [33876.951060] Oops: 0002 [#1] PREEMPT SMP [33876.951060] last sysfs file: /sys/devices/platform/it87.552/cpu0_vid [33876.951060] Modules linked in: nf_conntrack_ipv6 xt_tcpmss xt_length xt_TCPMSS ppp_synctty sch_sfq xt_u32 xt_CLASSIFY sch_htb ppp_async nfsd lockd sunrpc bnep exportfs rfcomm l2cap crc16 xt_state ip6t_LOG ip] [33876.951060] [33876.951060] Pid: 7, comm: ksoftirqd/1 Not tainted 2.6.35.4-git+ #git+ GA-MA69VM-S2/GA-MA69VM-S2 [33876.951060] EIP: 0060:[<f9b012bb>] EFLAGS: 00010246 CPU: 1 [33876.951060] EIP is at nf_ct_frag6_gather+0x864/0x881 [nf_conntrack_ipv6] [33877.071165] EAX: f68e1800 EBX: 00000000 ECX: f560f3c0 EDX: f74921a0 [33877.071165] ESI: 00000000 EDI: f636f200 EBP: f7495e34 ESP: f7495ddc [33877.071165] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [33877.071165] Process ksoftirqd/1 (pid: 7, ti=f7494000 task=f74921a0 task.ti=f7494000) [33877.071165] Stack: [33877.071165] 00000001 f5d6c8c0 f636f218 726b4c79 f68e1800 062c1158 f226d06c f560f3c0 [33877.071165] <0> f560f3d4 000005a8 00000000 f74921a0 00000001 00000000 00000000 726b4c79 [33877.071165] <0> 00000001 f226d04c f226d05c f5d6c8c0 00000000 f68e1800 f7495e48 f9b0043e [33877.071165] Call Trace: [33877.071165] [<f9b0043e>] ? ipv6_defrag+0x69/0x9f [nf_conntrack_ipv6] [33877.071165] [<c046ee87>] ? nf_iterate+0x2f/0x62 [33877.071165] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.071165] [<c046f088>] ? nf_hook_slow+0x63/0xeb [33877.071165] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.071165] [<c04c4aff>] ? ipv6_rcv+0x387/0x47c [33877.071165] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.071165] [<c0455065>] ? __netif_receive_skb+0x367/0x3b6 [33877.071165] [<c0455142>] ? process_backlog+0x8e/0x146 [33877.071165] [<c0455c3b>] ? net_rx_action+0x62/0x119 [33877.071165] [<c0232750>] ? __do_softirq+0x8b/0x10a [33877.071165] [<c02327fa>] ? do_softirq+0x2b/0x43 [33877.071165] [<c0232885>] ? run_ksoftirqd+0x73/0x155 [33877.071165] [<c0232812>] ? run_ksoftirqd+0x0/0x155 [33877.071165] [<c023fdbd>] ? kthread+0x61/0x66 [33877.071165] [<c023fd5c>] ? kthread+0x0/0x66 [33877.071165] [<c0202c7a>] ? kernel_thread_helper+0x6/0x1a [33877.071165] Code: 02 31 db 8b 45 c8 e8 8f 2c a1 c6 8b 4d c4 f0 ff 49 30 0f 94 c0 84 c0 74 0f 8b 45 c4 31 c9 ba 78 1a b0 f9 e8 38 fe 99 c6 8b 45 b8 <89> 43 14 89 5d ac eb 07 89 f8 e8 11 e3 94 c6 8b 45 ac 8d 6 [33877.071165] EIP: [<f9b012bb>] nf_ct_frag6_gather+0x864/0x881 [nf_conntrack_ipv6] SS:ESP 0068:f7495ddc [33877.071165] CR2: 0000000000000014 [33877.253064] ---[ end trace 91cffe982fd021cc ]--- [33877.257847] Kernel panic - not syncing: Fatal exception in interrupt [33877.264339] Pid: 7, comm: ksoftirqd/1 Tainted: G D 2.6.35.4-git+ #git+ [33877.271842] Call Trace: [33877.274420] [<c0511194>] ? printk+0xf/0x13 [33877.278743] [<c0511116>] panic+0x55/0xc4 [33877.282860] [<c02050ed>] oops_end+0x6e/0x7c [33877.287239] [<c021a514>] no_context+0x13f/0x149 [33877.291988] [<c021a657>] __bad_area_nosemaphore+0x139/0x141 [33877.297802] [<c0224fb6>] ? task_rq_lock+0x36/0x60 [33877.302760] [<c021a66c>] bad_area_nosemaphore+0xd/0x10 [33877.308107] [<c021a910>] do_page_fault+0x14e/0x302 [33877.313119] [<c0513a46>] ? _raw_spin_lock_irqsave+0x35/0x3e [33877.318985] [<c0513fe0>] ? _raw_spin_unlock_irqrestore+0x42/0x58 [33877.325261] [<c021a7c2>] ? do_page_fault+0x0/0x302 [33877.330306] [<c051499b>] error_code+0x6b/0x70 [33877.334854] [<c021a7c2>] ? do_page_fault+0x0/0x302 [33877.339926] [<f9b012bb>] ? nf_ct_frag6_gather+0x864/0x881 [nf_conntrack_ipv6] [33877.347451] [<f9b0043e>] ipv6_defrag+0x69/0x9f [nf_conntrack_ipv6] [33877.353958] [<c046ee87>] nf_iterate+0x2f/0x62 [33877.358560] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.363588] [<c046f088>] nf_hook_slow+0x63/0xeb [33877.368322] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.373388] [<c04c4aff>] ipv6_rcv+0x387/0x47c [33877.377965] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e [33877.383022] [<c0455065>] __netif_receive_skb+0x367/0x3b6 [33877.388558] [<c0455142>] process_backlog+0x8e/0x146 [33877.393715] [<c0455c3b>] net_rx_action+0x62/0x119 [33877.398664] [<c0232750>] __do_softirq+0x8b/0x10a [33877.403554] [<c02327fa>] do_softirq+0x2b/0x43 [33877.408154] [<c0232885>] run_ksoftirqd+0x73/0x155 [33877.413051] [<c0232812>] ? run_ksoftirqd+0x0/0x155 [33877.418053] [<c023fdbd>] kthread+0x61/0x66 [33877.422360] [<c023fd5c>] ? kthread+0x0/0x66 [33877.426735] [<c0202c7a>] kernel_thread_helper+0x6/0x1a -- Simon Arlott -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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