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Subject[2.4.20] segfault when unloading soundmodem-driver

I tried to unload the soundmodem-driver (for hamradio) and got a segfault.
lsmod tells me:
soundmodem 0 0 (deleted)

and dmesg tells me:
soundmodem: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA
soundmodem: version 0.12 compiled 02:55:25 Feb 9 2003
sm: cleanup_module called
Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
*pde = 0496c067
*pte = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<d032b642>] Not tainted
EFLAGS: 00010202
eax: 00000000 ebx: c66a6000 ecx: 00000000 edx: cac34d60
esi: d0330c60 edi: ffffffed ebp: bfffea08 esp: c2565f58
ds: 0018 es: 0018 ss: 0018
Process rmmod (pid: 12304, stackpage=c2565000)
Stack: 00000000 00000000 000000ff c66a6000 d0330c60 d0331074 d011e43f
d0330c60 d0330cc8 d032c1a6 d0330c60 d032b000 fffffff0 d032b000
d032b000 fffffff0 c294d000 bfffea08 c01146e7 d032b000 00000000
Call Trace: [<d0330c60>] [<d0331074>] [<d011e43f>] [<d0330c60>]
[<d0330cc8>] [<d032c1a6>] [<d0330c60>] [<c0115343>] [<c01146e7>]

Code: 8b 00 50 68 92 fc 32 d0 68 a0 ff 32 d0 e8 c4 81 de ef 89 f8

Kernel version 2.4.20

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