kernel bug : file.c at line 72

Hi,

I get this message:

kernel BUG at file.c:72!
invalid operand: 0000
CPU:    0
EIP:    0010:[<c01522e6>]
EFLAGS: 00010286
eax: 00000019   ebx: 00000000   ecx: c1472000   edx: c02aada0
esi: 00001743   edi: c04f22a0   ebp: c18d8960   esp: c1473e54
ds: 0018   es: 0018   ss: 0018
Process wget (pid: 812, stackpage=c1473000)
Stack: c024e18c c024e26d 00000048 00000793 00000800 000002e8 c1473eb0
c08bdc00
       c012da58 c04f22a0 00001743 c18d8960 00000001 00000793 c1473f58
000002e8
       00000bc7 c19a4000 c18d8a80 00000200 00001743 00000600 c18d8960
c0124a76
Call Trace: [<c012da58>] [<c0124a76>] [<c012e073>] [<c0152274>]
[<c0153a66>] [<c0152274>] [<c0121332>]
       [<c01523c2>] [<c0152399>] [<c012b6fb>] [<c0106b43>]

Code: 0f 0b 83 c4 0c b8 fb ff ff ff eb 72 8b 87 8c 00 00 00 31 d2

Jul 26 01:13:29 ns1 kernel: Call Trace: [__block_prepare_write+240/584]
[reclaim_page+806/1044] [cont_prepare_write+459/652] [fat_get_block+0/248]
[fat_prepare_write+38/44] [fat_get_block+0/248]
[generic_file_write+954/1336]
Jul 26 01:13:29 ns1 kernel:        [default_fat_file_write+34/80]
[fat_file_write+45/52] [sys_write+143/196] [system_call+51/64]
Jul 26 01:13:29 ns1 kernel:

This happens while I try to download many files using wget on a fat32
partition on a 30GB IBM disk (IBM-DTLA-307030).

This message never appeard before. I mention that the kernel is 2.4.7
patched against ipsec and vlan. With previous kernels I had no problem.