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Subjectide-cd oops in 2.4.19-pre3-ac5

I got an oops trying to load ide-cd, which is
perpetually stuck on initialization:
here is the ksymoops output:
(ide-cd loaded as a module)
kernel BUG at ide-cd.c:790!
invalid operand: 0000
CPU: 0
EIP: 0010:[<d8f88951>] Tainted: PF
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00013246
eax: c1511160 ebx: c02f0100 ecx: 0880cd97 edx: 00000177
esi: 000001f4 edi: c8a2be34 ebp: d8f89428 esp: c8a2bc50
ds: 0018 es: 0018 ss: 0018
Process modprobe (pid: 1252, stackpage=c8a2b000)
Stack: c02f0100 cbf4c200 00000000 d8f89428 00800363 d8f89454 c02f0100 c8a2be1c
d8f89260 d8f888a5 c02f0100 c02f0100 cbf4c200 c8a2bd6c 00000000 00000190
d8f8949b c02f0100 00000018 d8f89428 d8f899d8 c02f0100 00000000 c02f0100
Call Trace: [<d8f89428>] [<d8f89454>] [<d8f89260>] [<d8f888a5>] [<d8f8949b>]
[<d8f89428>] [<d8f899d8>] [<c01c6032>] [<c01c6349>] [<c01c691a>] [<d8f89513>]
[<c012a7a4>] [<c012e8fe>] [<d8f8a39f>] [<d8f8e740>] [<d8f817ee>] [<d8f8e1b9>]
[<d8f8e740>] [<d8f8aa9b>] [<d8f8e350>] [<d8f8ab0b>] [<d8f8e350>] [<d8f8b44c>]
[<d8f8b9b4>] [<c011476d>] [<d8f88060>] [<c0106e43>] [<c023002b>]
Code: 0f 0b 16 03 62 dd f8 d8 68 2c 87 f8 d8 56 8b 44 24 28 50 53

>>EIP; d8f88951 <[ide-cd]cdrom_transfer_packet_command+71/a4> <=====
Trace; d8f89428 <[ide-cd]cdrom_do_pc_continuation+0/30>
Trace; d8f89454 <[ide-cd]cdrom_do_pc_continuation+2c/30>
Trace; d8f89260 <[ide-cd]cdrom_pc_intr+0/1c8>
Trace; d8f888a5 <[ide-cd]cdrom_start_packet_command+141/17c>
Trace; d8f8949b <[ide-cd]cdrom_do_packet_command+43/48>
Trace; d8f89428 <[ide-cd]cdrom_do_pc_continuation+0/30>
Trace; d8f899d8 <[ide-cd]ide_do_rw_cdrom+108/144>
Trace; c01c6032 <start_request+1a2/1fc>
Trace; c01c6349 <ide_do_request+27d/2c8>
Trace; c01c691a <ide_do_drive_cmd+ee/120>
Trace; d8f89513 <[ide-cd]cdrom_queue_packet_command+4f/b4>
Trace; c012a7a4 <__alloc_pages+64/2b0>
Trace; c012e8fe <page_add_rmap+2a/40>
Trace; d8f8a39f <[ide-cd]ide_cdrom_packet+6b/78>
Trace; d8f8e740 <[ide-cd]ide_cdrom_dops+0/40>
Trace; d8f817ee <[cdrom]cdrom_mode_sense+5a/64>
Trace; d8f8e1b9 <[ide-cd]sense_data_texts+21e1/25a7>
Trace; d8f8e740 <[ide-cd]ide_cdrom_dops+0/40>
Trace; d8f8aa9b <[ide-cd]ide_cdrom_get_capabilities+9f/b4>
Trace; d8f8e350 <[ide-cd]sense_data_texts+2378/25a7>
Trace; d8f8ab0b <[ide-cd]ide_cdrom_probe_capabilities+5b/44c>
Trace; d8f8e350 <[ide-cd]sense_data_texts+2378/25a7>
Trace; d8f8b44c <[ide-cd]ide_cdrom_setup+468/4e4>
Trace; d8f8b9b4 <[ide-cd]init_module+f0/19b>
Trace; c011476d <sys_init_module+505/5a8>
Trace; d8f88060 <[ide-cd]__module_license+0/0>
Trace; c0106e43 <system_call+33/38>
Trace; c023002b <rwsem_wake+1843/1e64>
Code; d8f88951 <[ide-cd]cdrom_transfer_packet_command+71/a4>
00000000 <_EIP>:
Code; d8f88951 <[ide-cd]cdrom_transfer_packet_command+71/a4> <=====
0: 0f 0b ud2a <=====
Code; d8f88953 <[ide-cd]cdrom_transfer_packet_command+73/a4>
2: 16 push %ss
Code; d8f88954 <[ide-cd]cdrom_transfer_packet_command+74/a4>
3: 03 62 dd add 0xffffffdd(%edx),%esp
Code; d8f88957 <[ide-cd]cdrom_transfer_packet_command+77/a4>
6: f8 clc
Code; d8f88958 <[ide-cd]cdrom_transfer_packet_command+78/a4>
7: d8 68 2c fsubrs 0x2c(%eax)
Code; d8f8895b <[ide-cd]cdrom_transfer_packet_command+7b/a4>
a: 87 f8 xchg %edi,%eax
Code; d8f8895d <[ide-cd]cdrom_transfer_packet_command+7d/a4>
c: d8 56 8b fcoms 0xffffff8b(%esi)
Code; d8f88960 <[ide-cd]cdrom_transfer_packet_command+80/a4>
f: 44 inc %esp
Code; d8f88961 <[ide-cd]cdrom_transfer_packet_command+81/a4>
10: 24 28 and $0x28,%al
Code; d8f88963 <[ide-cd]cdrom_transfer_packet_command+83/a4>
12: 50 push %eax
Code; d8f88964 <[ide-cd]cdrom_transfer_packet_command+84/a4>
13: 53 push %ebx


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