Hi, zhaojingmin
Two computer(a linux box as a router, one in nat, the other one outside of nat) has established a connection by Windows Netmeeting. When I did rmmod ip_nat_h323.ko & ip_conntrack_h323.ko, then hang up the call, it caused a kernel panic.
I found that the epc is the address of "h245_help" function. The helper didn't set to null when h323 conntrack module fini.
If I flushed ip_conntrack first, then rmmod the module & hang up, it' all right. I also tried patch-2.6.18-nath323-1.5, the problem still exist.
________________________________________________________________________________________________
CPU 0 Unable to handle kernel paging request at virtual address c00a6828, epc == 802224dc, ra == 801d4e7c
Oops[#1]:
Cpu 0
$ 0 : 00000000 00000000 00000004 c00a67f0
$ 4 : 802a5ad0 81657e00 00000000 00000000
$ 8 : 00000008 801461c8 00000000 80570050
$12 : 819b0280 819b04b0 00000006 00000000
$16 : 802a5a60 80000000 80b46000 80321010
$20 : 00000000 00000004 802a5ad0 00000001
$24 : 00000000 802257a8
$28 : 802a4000 802a59e8 00000004 801d4e7c
Hi : 0000000b
Lo : 00506320
epc : 802224dc ip_conntrack_help+0x38/0x74 Tainted: P
ra : 801d4e7c nf_iterate+0xbc/0x130
Status: 1000f403 KERNEL EXL IE
Cause : 00800008
BadVA : c00a6828
PrId : 00019374
Modules linked in: ip_nat_pptp ip_conntrack_pptp ath_pktlog wlan_acl wlan_wep wlan_tkip wlan_ccmp wlan_xauth ath_pci ath_dev ath_dfs ath_rate_atheros wlan ath_hal ip_nat_tftp ip_conntrack_tftp ip_nat_ftp ip_conntrack_ftp pppoe ppp_async ppp_deflate ppp_mppe pppox ppp_generic slhc
Process swapper (pid: 0, threadinfo=802a4000, task=802a6000)
Stack : 801e7d98 00000004 802a5a60 80000000 801d4e7c 801d4e7c 802a5ad0 00000004
00000000 00000000 801e7d98 00000000 00000004 802a5ad0 00000000 00000010
801e7d98 80b46000 802a5a60 80320000 80000000 801d4f8c 802a5b00 00000002
80063834 00000000 80b46000 802a5a60 801e7d98 80000000 802ba854 00000000
81a02180 80b7e260 81a021b0 819b0000 819b0000 80570056 00000000 00000001
...
Call Trace:
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801d4e7c>] nf_iterate+0xbc/0x130
[<801d4e7c>] nf_iterate+0xbc/0x130
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801d4f8c>] nf_hook_slow+0x9c/0x1a4
[<80063834>] handle_adel_int+0x2c/0x38
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801e81c8>] ip_output+0x1f4/0x30c
[<801e4d70>] ip_forward_finish+0x0/0x58
[<801e7d98>] ip_finish_output+0x0/0x23c
[<801e4fe0>] ip_forward+0x218/0x368
[<801e5104>] ip_forward+0x33c/0x368
[<801e4d70>] ip_forward_finish+0x0/0x58
[<801e3780>] ip_rcv+0x33c/0x65c
[<801e30ec>] ip_rcv_finish+0x0/0x358
[<801bad10>] netif_receive_skb+0x464/0x4d0
[<80255650>] br_pass_frame_up+0xa0/0xac
[<801ba8ac>] netif_receive_skb+0x0/0x4d0
[<80255f4c>] br_handle_frame_finish+0x188/0x250
[<80255e58>] br_handle_frame_finish+0x94/0x250
[<801d4f8c>] nf_hook_slow+0x9c/0x1a4
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<8025af70>] br_nf_pre_routing_finish+0x224/0x474
[<80233408>] ip_nat_in+0x30/0xd8
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<80233428>] ip_nat_in+0x50/0xd8
[<8025ad4c>] br_nf_pre_routing_finish+0x0/0x474
[<801d4e7c>] nf_iterate+0xbc/0x130
[<8025ad4c>] br_nf_pre_routing_finish+0x0/0x474
[<8025ad4c>] br_nf_pre_routing_finish+0x0/0x474
[<801d4f8c>] nf_hook_slow+0x9c/0x1a4
[<8025ad4c>] br_nf_pre_routing_finish+0x0/0x474
[<8025ba1c>] br_nf_pre_routing+0x7ec/0x838
[<8025ba50>] br_nf_pre_routing+0x820/0x838
[<8025ad4c>] br_nf_pre_routing_finish+0x0/0x474
[<801d4e7c>] nf_iterate+0xbc/0x130
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<801d4f8c>] nf_hook_slow+0x9c/0x1a4
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<802562cc>] br_handle_frame+0x260/0x274
[<c01b5e24>] ath_rx_tasklet+0x5e4/0xa50 [ath_dev]
[<8017e758>] ag7100_buffer_alloc+0x18/0x50
[<80255dc4>] br_handle_frame_finish+0x0/0x250
[<801bac5c>] netif_receive_skb+0x3b0/0x4d0
[<c011d304>] ath_hal_reg_read+0x38/0x4c [ath_hal]
[<8017eb0c>] ag7100_poll+0x214/0x664
[<801baff0>] net_rx_action+0x9c/0x19c
[<8008c2ec>] __do_softirq+0x84/0x118
[<8008c3e8>] do_softirq+0x68/0x80
[<800647f4>] do_IRQ+0x24/0x34
[<8006134c>] ar7100_interrupt_receive+0xec/0x100
[<8006134c>] ar7100_interrupt_receive+0xec/0x100
[<80062be4>] r4k_wait+0x0/0xc
[<80064a30>] cpu_idle+0x50/0x58
[<80062be8>] r4k_wait+0x4/0xc
[<802df884>] start_kernel+0x26c/0x2b8
[<802df130>] unknown_bootoption+0x0/0x310
Code: 24020004 10e2000c 00e03021 <8c620038> 0040f809 00000000 24030001 10430005 00402021
Kernel panic - not syncing: Aiee, killing interrupt handler!
liannan
2008-06-14
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