Re: BUG: unable to handle kernel NULL pointer dereference at 000002c0 / IP: [<c04c70f2>] in6_dev_finish_destroy+0x35/0x8c

From: Simon Arlott
Date: Fri Apr 15 2011 - 12:53:28 EST

and again with the patch reverted...

[ 470.965098] BUG: unable to handle kernel paging request at a1fd3e8b
[ 470.966008] IP: [<c04d89a7>] icmpv6_send+0x5c3/0x6e2
[ 470.966008] *pdpt = 00000000318f2001 *pde = 0000000000000000
[ 470.966008] Oops: 0002 [#1] PREEMPT SMP
[ 470.966008] last sysfs file: /sys/devices/platform/it87.552/cpu0_vid
[ 470.966008] Modules linked in: nf_conntrack_ipv6 xt_tcpmss xt_length xt_TCPMSS ppp_synctty sch_sfq xt_u32 xt_CLASSIFY sch_htb ppp_async rfcomm bnep l2cap crc16 nfsd lockd sunrpc exportfs xt_state ip6t_LOG ip]
[ 470.966008]
[ 470.966008] Pid: 3, comm: ksoftirqd/0 Not tainted 2.6.35.4-git+ #git+ GA-MA69VM-S2/GA-MA69VM-S2
[ 470.966008] EIP: 0060:[<c04d89a7>] EFLAGS: 00010286 CPU: 0
[ 470.966008] EIP is at icmpv6_send+0x5c3/0x6e2
[ 470.966008] EAX: 00000000 EBX: a1fd3daf ECX: 00000000 EDX: 00000001
[ 470.966008] ESI: f6f1adb4 EDI: 00000000 EBP: f7483c4c ESP: f7483b48
[ 470.966008] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 470.966008] Process ksoftirqd/0 (pid: 3, ti=f7482000 task=f74800a0 task.ti=f7482000)
[ 470.966008] Stack:
[ 470.966008] f493fec0 f7483b5c c0513fe0 00033acf 00033ab5 f7483b7c c022e74d 00000046
[ 470.966008] <0> fffffd8a 00033acf 00000001 0101001a f1a2984c 00000500 f6f1aac0 f6f1adb4
[ 470.966008] <0> f1a2985c 00000000 00000040 f6f1aaf0 00000000 00000000 00000000 b0060120
[ 470.966008] Call Trace:
[ 470.966008] [<c0513fe0>] ? _raw_spin_unlock_irqrestore+0x42/0x58
[ 470.966008] [<c022e74d>] ? release_console_sem+0x197/0x1c4
[ 470.966008] [<fa73c0b5>] ? reject_tg6+0x70/0x43f [ip6t_REJECT]
[ 470.966008] [<fa7619b1>] ? ip6t_log_packet+0x15d/0x167 [ip6t_LOG]
[ 470.966008] [<c024e201>] ? trace_hardirqs_on+0xb/0xd
[ 470.966008] [<c0232a72>] ? local_bh_enable_ip+0x97/0xad
[ 470.966008] [<c0513f59>] ? _raw_spin_unlock_bh+0x2f/0x32
[ 470.966008] [<fa7619b1>] ? ip6t_log_packet+0x15d/0x167 [ip6t_LOG]
[ 470.966008] [<fa6290f0>] ? ipv6_find_hdr+0x48/0x164 [ip6_tables]
[ 470.966008] [<fa6297c1>] ? ip6t_do_table+0x4c8/0x53e [ip6_tables]
[ 470.966008] [<fa6cf0f0>] ? ip6table_mangle_hook+0xf0/0x100 [ip6table_mangle]
[ 470.966008] [<fa634018>] ? ip6table_filter_hook+0x18/0x20 [ip6table_filter]
[ 470.966008] [<c046ee87>] ? nf_iterate+0x2f/0x62
[ 470.966008] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 470.966008] [<c046f088>] ? nf_hook_slow+0x63/0xeb
[ 470.966008] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 470.966008] [<c04c44d6>] ? ip6_input+0x33/0x47
[ 470.966008] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 470.966008] [<c04c4775>] ? ip6_rcv_finish+0x8b/0x8e
[ 470.966008] [<fc81ea3a>] ? nf_ct_frag6_output+0x7c/0x95 [nf_conntrack_ipv6]
[ 470.966008] [<fc81e45c>] ? ipv6_defrag+0x87/0x9f [nf_conntrack_ipv6]
[ 470.966008] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 470.966008] [<c046ee87>] ? nf_iterate+0x2f/0x62
[ 470.966008] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 470.966008] [<c046f088>] ? nf_hook_slow+0x63/0xeb
[ 470.966008] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 470.966008] [<c04c4aff>] ? ipv6_rcv+0x387/0x47c
[ 470.966008] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 470.966008] [<c0455065>] ? __netif_receive_skb+0x367/0x3b6
[ 470.966008] [<c0455142>] ? process_backlog+0x8e/0x146
[ 470.966008] [<c0455c3b>] ? net_rx_action+0x62/0x119
[ 470.966008] [<c0232750>] ? __do_softirq+0x8b/0x10a
[ 470.966008] [<c02327fa>] ? do_softirq+0x2b/0x43
[ 470.966008] [<c0232885>] ? run_ksoftirqd+0x73/0x155
[ 470.966008] [<c0232812>] ? run_ksoftirqd+0x0/0x155
[ 470.966008] [<c023fdbd>] ? kthread+0x61/0x66
[ 470.966008] [<c023fd5c>] ? kthread+0x0/0x66
[ 470.966008] [<c0202c7a>] ? kernel_thread_helper+0x6/0x1a
[ 470.966008] Code: e8 1b da d4 ff 68 48 89 4d c0 31 c9 31 d2 b8 58 11 68 c0 6a 00 6a 01 6a 02 e8 37 76 d7 ff 8b 9b 60 01 00 00 83 c4 10 85 db 74 07 <f0> ff 83 dc 00 00 00 b9 ae 89 4d c0 ba 01 00 00 00 b8 58 1
[ 470.966008] EIP: [<c04d89a7>] icmpv6_send+0x5c3/0x6e2 SS:ESP 0068:f7483b48
[ 470.966008] CR2: 00000000a1fd3e8b
[ 471.387732] ---[ end trace a325ca681eff783c ]---
[ 471.388770] __iptables__: l2tp_2 IN=aaisp3 OUT= MAC= SRC=2001:0678:0001:0000:0000:0000:0000:0001 DST=2001:08b0:ffea:0000:0053:4150:5841:0001 LEN=430 TC=0 HOPLIMIT=60 FLOWLBL=0 PROTO=UDP SPT=53 DPT=22008 LEN=
[ 471.388833] __iptables__: l2tp_2 IN=aaisp3 OUT= MAC= SRC=80.68.89.159 DST=81.2.80.67 LEN=143 TOS=0x00 PREC=0x00 TTL=59 ID=12462 PROTO=UDP SPT=53 DPT=36911 LEN=123
[ 471.388874] __iptables__: l2tp_2 IN=aaisp3 OUT= MAC= SRC=208.94.149.2 DST=81.2.80.67 LEN=116 TOS=0x00 PREC=0x00 TTL=58 ID=22935 PROTO=UDP SPT=53 DPT=10068 LEN=96
[ 471.443611] Kernel panic - not syncing: Fatal exception in interrupt
[ 471.444704] __iptables__: l2tp_2 IN=aaisp3 OUT= MAC= SRC=208.94.148.2 DST=81.2.80.67 LEN=120 TOS=0x00 PREC=0x00 TTL=58 ID=41552 PROTO=UDP SPT=53 DPT=27444 LEN=100
[ 471.444739] __iptables__: l2tp_2 IN=aaisp3 OUT= MAC= SRC=2a01:06d0:0001:0000:0000:0000:0000:0002 DST=2001:08b0:ffea:0000:0053:4150:5841:0001 LEN=109 TC=0 HOPLIMIT=56 FLOWLBL=0 PROTO=UDP SPT=53 DPT=31279 LEN=
[ 471.484694] Pid: 3, comm: ksoftirqd/0 Tainted: G D 2.6.35.4-git+ #git+
[ 471.492318] Call Trace:
[ 471.494885] [<c0511194>] ? printk+0xf/0x13
[ 471.499161] [<c0511116>] panic+0x55/0xc4
[ 471.503331] [<c02050ed>] oops_end+0x6e/0x7c
[ 471.507768] [<c021a514>] no_context+0x13f/0x149
[ 471.512534] [<c021a657>] __bad_area_nosemaphore+0x139/0x141
[ 471.518341] [<c04cef8d>] ? fib6_lookup+0x48/0x5c
[ 471.523203] [<c04cdd75>] ? ip6_pol_route+0x208/0x223
[ 471.528422] [<c024e201>] ? trace_hardirqs_on+0xb/0xd
[ 471.533608] [<c0232a72>] ? local_bh_enable_ip+0x97/0xad
[ 471.539055] [<c0513d08>] ? _raw_read_unlock_bh+0x2f/0x32
[ 471.544620] [<c04cdd75>] ? ip6_pol_route+0x208/0x223
[ 471.549821] [<c021a66c>] bad_area_nosemaphore+0xd/0x10
[ 471.555192] [<c021a910>] do_page_fault+0x14e/0x302
[ 471.560145] [<c04b3486>] ? __xfrm_lookup+0x32d/0x38b
[ 471.565396] [<c04e8bbe>] ? fib6_rule_lookup+0x35/0x77
[ 471.570720] [<c021a7c2>] ? do_page_fault+0x0/0x302
[ 471.575807] [<c051499b>] error_code+0x6b/0x70
[ 471.580443] [<c021a7c2>] ? do_page_fault+0x0/0x302
[ 471.585476] [<c04d89a7>] ? icmpv6_send+0x5c3/0x6e2
[ 471.590527] [<c0513fe0>] ? _raw_spin_unlock_irqrestore+0x42/0x58
[ 471.596755] [<c022e74d>] ? release_console_sem+0x197/0x1c4
[ 471.602547] [<fa73c0b5>] reject_tg6+0x70/0x43f [ip6t_REJECT]
[ 471.608472] [<fa7619b1>] ? ip6t_log_packet+0x15d/0x167 [ip6t_LOG]
[ 471.614834] [<c024e201>] ? trace_hardirqs_on+0xb/0xd
[ 471.620120] [<c0232a72>] ? local_bh_enable_ip+0x97/0xad
[ 471.625575] [<c0513f59>] ? _raw_spin_unlock_bh+0x2f/0x32
[ 471.631145] [<fa7619b1>] ? ip6t_log_packet+0x15d/0x167 [ip6t_LOG]
[ 471.637519] [<fa6290f0>] ? ipv6_find_hdr+0x48/0x164 [ip6_tables]
[ 471.643794] [<fa6297c1>] ip6t_do_table+0x4c8/0x53e [ip6_tables]
[ 471.650014] [<fa6cf0f0>] ? ip6table_mangle_hook+0xf0/0x100 [ip6table_mangle]
[ 471.657364] [<fa634018>] ip6table_filter_hook+0x18/0x20 [ip6table_filter]
[ 471.664419] [<c046ee87>] nf_iterate+0x2f/0x62
[ 471.668935] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 471.674231] [<c046f088>] nf_hook_slow+0x63/0xeb
[ 471.678999] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 471.684321] [<c04c44d6>] ip6_input+0x33/0x47
[ 471.688851] [<c04c40c8>] ? ip6_input_finish+0x0/0x3db
[ 471.694097] [<c04c4775>] ip6_rcv_finish+0x8b/0x8e
[ 471.699002] [<fc81ea3a>] nf_ct_frag6_output+0x7c/0x95 [nf_conntrack_ipv6]
[ 471.706039] [<fc81e45c>] ipv6_defrag+0x87/0x9f [nf_conntrack_ipv6]
[ 471.712470] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 471.717471] [<c046ee87>] nf_iterate+0x2f/0x62
[ 471.722013] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 471.727013] [<c046f088>] nf_hook_slow+0x63/0xeb
[ 471.731703] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 471.736764] [<c04c4aff>] ipv6_rcv+0x387/0x47c
[ 471.741384] [<c04c46ea>] ? ip6_rcv_finish+0x0/0x8e
[ 471.746438] [<c0455065>] __netif_receive_skb+0x367/0x3b6
[ 471.752011] [<c0455142>] process_backlog+0x8e/0x146
[ 471.757063] [<c0455c3b>] net_rx_action+0x62/0x119
[ 471.761994] [<c0232750>] __do_softirq+0x8b/0x10a
[ 471.766822] [<c02327fa>] do_softirq+0x2b/0x43
[ 471.771354] [<c0232885>] run_ksoftirqd+0x73/0x155
[ 471.776252] [<c0232812>] ? run_ksoftirqd+0x0/0x155
[ 471.781253] [<c023fdbd>] kthread+0x61/0x66
[ 471.785544] [<c023fd5c>] ? kthread+0x0/0x66
[ 471.789957] [<c0202c7a>] kernel_thread_helper+0x6/0x1a
[ 471.795306] Rebooting in 10 seconds..

--
Simon Arlott
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