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Subject2.6.9-rc2 oops due to UDP packet.
I attach an oops that causes my SMP Pentium 4 system to hang, requiring 
me to press the reset button.

It seems to be due to an error in the processing of a UDP packet.
It happens quite rarely, about once every few days, but it is certainly
annoying.

Could anyone help me track this bug down?

James
new login: ------------[ cut here ]------------
kernel BUG at include/asm/spinlock.h:90!
invalid operand: 0000 [#1]
PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: md5 ipv6 ide_cd cdrom lp parport usbhid uhci_hcd usbcore e1000
CPU: 1
EIP: 0060:[<c02fecc0>] Not tainted VLI
EFLAGS: 00010202 (2.6.9-rc2)
EIP is at _spin_unlock+0x36/0x46
eax: 00000001 ebx: f1e8ef00 ecx: 00000002 edx: f33aa93c
esi: f33aa800 edi: f33aa93c ebp: c213bbb4 esp: c213bbb4
ds: 007b es: 007b ss: 0068
Process hotwayd (pid: 13950, threadinfo=c213a000 task=db25caa0)
Stack: c213bbd4 c0298e81 f33aa800 f1e8ef00 00000000 f6dc10e4 f6dc10fc d12aae08
c213bc0c c02aea71 c3951f54 d12aae24 c213bc10 c02afe71 d12aae44 c213bea0
00000000 f6dc10d0 c3951f54 c213bc48 c3951f54 d34daf04 c213bc58 c02b0cfe
Call Trace:
[<c01050e7>] show_stack+0x80/0x96
[<c010527a>] show_registers+0x15d/0x1d6
[<c01054a8>] die+0x112/0x19d
[<c01059a9>] do_invalid_op+0xee/0x10a
[<c0104d01>] error_code+0x2d/0x38
[<c0298e81>] dev_queue_xmit+0x23b/0x2d4
[<c02aea71>] ip_finish_output+0xda/0x24c
[<c02b0cfe>] ip_push_pending_frames+0x266/0x49a
[<c02ce758>] udp_push_pending_frames+0x12f/0x25a
[<c02cef22>] udp_sendmsg+0x661/0x7a9
[<c028f99f>] sock_sendmsg+0xbf/0xe3
[<c0290f7c>] sys_sendto+0xe8/0x107
[<c0290fd1>] sys_send+0x36/0x38
[<c029184d>] sys_socketcall+0x141/0x234
[<c0104277>] syscall_call+0x7/0xb
Code: e5 75 1e 0f b6 02 84 c0 7f 21 c6 02 01 b8 00 e0 ff ff 21 e0 83 68 14 01 8b 40 08 a8 08 75 16 5d c3 0f 0b 59 00 80 05 31 c0 eb d8 <0f> 0b 5a 00 80 05 31 c0 eb d5 5d e9 c6 f5 ff ff 55 89 e5 f0 81
<0>Kernel panic - not syncing: Fatal exception in interrupt
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