Distribution:
Debian GNU/Linux 3.1

Hardware Environment:
Apple PowerBook G4 Aluminum 12" 1.33GHz

~~~snip~~~
$ cat /proc/cpuinfo
processor       : 0
cpu             : 7447A, altivec supported
clock           : 1333MHz
revision        : 1.1 (pvr 8003 0101)
bogomips        : 1327.10
machine         : PowerBook6,4
motherboard     : PowerBook6,4 MacRISC3 Power Macintosh
detected as     : 287 (PowerBook G4 12")
pmac flags      : 0000000a
L2 cache        : 512K unified
memory          : 256MB
pmac-generation : NewWorld
$ lspci
0000:00:0b.0 Host bridge: Apple Computer Inc. UniNorth 2 AGP
0000:00:10.0 VGA compatible controller: nVidia Corporation NV34M [GeForce FX 
Go5200] (rev a1)
0001:01:0b.0 Host bridge: Apple Computer Inc. UniNorth 2 PCI
0001:01:12.0 Network controller: Broadcom Corporation BCM4306 802.11b/g 
Wireless LAN Controller (rev 03)
0001:01:17.0 ff00: Apple Computer Inc. KeyLargo/Intrepid Mac I/O
0001:01:18.0 USB Controller: Apple Computer Inc. KeyLargo/Intrepid USB
0001:01:19.0 USB Controller: Apple Computer Inc. KeyLargo/Intrepid USB
0001:01:1a.0 USB Controller: Apple Computer Inc. KeyLargo/Intrepid USB
0001:01:1b.0 USB Controller: NEC Corporation USB (rev 43)
0001:01:1b.1 USB Controller: NEC Corporation USB (rev 43)
0001:01:1b.2 USB Controller: NEC Corporation USB 2.0 (rev 04)
0002:02:0b.0 Host bridge: Apple Computer Inc. UniNorth 2 Internal PCI
0002:02:0d.0 ff00: Apple Computer Inc. UniNorth/Intrepid ATA/100
0002:02:0e.0 FireWire (IEEE 1394): Apple Computer Inc. UniNorth 2 FireWire (rev 
81)
0002:02:0f.0 Ethernet controller: Apple Computer Inc. UniNorth 2 GMAC (Sun GEM) 
(rev 80)
~~~snip~~~

Software Environment:
Linux bauxite 2.6.8-powerpc #1 Tue Sep 14 00:15:52 CEST 2004 ppc GNU/Linux

Gnu C                  3.3.4
Gnu make               3.80
binutils               2.15
util-linux             2.12
mount                  2.12
module-init-tools      3.1-pre5
e2fsprogs              1.35
nfs-utils              1.0.6
Linux C Library        2.3.2
Dynamic linker (ldd)   2.3.2
Procps                 3.2.1
Net-tools              1.60
Console-tools          0.2.3
Sh-utils               5.2.1
Modules Loaded         sg ipv6 snd_powermac snd_pcm_oss snd_mixer_oss snd_pcm 
snd_page_alloc snd_timer snd soundcore af_packet eth1394 sungem crc32 
sungem_phy ohci1394 ehci_hcd joydev usbhid ohci_hcd usbcore uninorth_agp 
agpgart evdev tsdev dm_mod therm_adt746x cpufreq_userspace sbp2 ieee1394 sr_mod 
cdrom ide_scsi scsi_mod isofs nls_base reiserfs ext3 jbd mbcache ide_disk unix

~~~snip~~~
cat /proc/cmdline
root=dev/hda4 ro hdc=scsi
~~~snip~~~

It is debian's kernel-image-2.6.8-powerpc kernel tree, not Linus' tree.

Problem Description:
rmmod ide-scsi cause kernel oops.

Steps to reproduce:
I burn a cd image with cdrecord.

~~~snip~~~
$ cdrecord -tao -dummy -v -v -v fs=8m speed=8 dev=0,0 download/sarge-
netinst/sarge-powerpc-netinst.iso
Cdrecord-Clone 2.01a34 (powerpc-unknown-linux-gnu) Copyright (C) 1995-2004 J