Kernel oops: 2.6.16-rc3-mm1 dvd mount

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[Note: please cc me on answers since I'm not subscribed to the kernel list]

Trying to mount a DVD drive connected to an Adaptec 29160 SCSI controller
(through an IDE-to-SCSI bridge), I get a crash in the kernel.
The mount command:
$: mount /dev/sr1 /dvd
The log:
BUG: unable to handle kernel NULL pointer dereference at virtual address 0000000c
 printing eip:
c0274f77
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
last sysfs file: /class/net/eth2/ifindex
Modules linked in: pl2303 usbserial softdog snd_pcm_oss snd_mixer_oss snd_cs46xx
gameport snd_rawmidi snd_seq_device snd_ac97_codec snd_ac97_bus snd_pcm
snd_timer snd soundcore snd_page_alloc zoran i2c_algo_bit videodev saa7
111 i2c_core pegasus arc4 ppp_mppe ppp_deflate ppp_generic slhc usblp
CPU:    0
EIP:    0060:[<c0274f77>]    Not tainted VLI
EFLAGS: 00010096   (2.6.16-rc3-mm1 #2)
EIP is at elv_may_queue+0xc/0x2b
eax: 00000000   ebx: d8712000   ecx: 00000000   edx: 00000000
esi: 00000000   edi: 00000000   ebp: 00000010   esp: d8713ccc
ds: 007b   es: 007b   ss: 0068
Process mount (pid: 3328, threadinfo=d8712000 task=e2bfa560)
Stack: <0>d8712000 00000000 c027762b e2bfa560 c0111f3e 00000000 00000000 00000000
       00000082 d8712000 00000000 c17f1400 00000000 c02778d9 00000010 00000000
       e978c82a 00000000 d8713d98 00000000 e978c82a 00000000 c0277e11 00000001
Call Trace:
 <c027762b> get_request+0x27/0x2b8   <c0111f3e> default_wake_function+0x0/0xc
 <c02778d9> get_request_wait+0x1d/0x12b   <c0277e11> blk_execute_rq+0x96/0xcf
 <c0278000> blk_end_sync_rq+0x0/0x1d   <c02778d9> get_request_wait+0x1d/0x12b
 <c0136cd3> mempool_free+0x48/0x9b   <c0277a0f> blk_get_request+0x28/0x65
 <c03582ad> scsi_execute+0x2c/0xde   <c0136cd3> mempool_free+0x48/0x9b
 <c03a678e> sr_do_ioctl+0x82/0x22a   <c013d6c7> kzalloc+0x1b/0x50
 <c03a6466> sr_read_tochdr+0x6a/0x89   <c03ad52f> cdrom_count_tracks+0x66/0x171
 <c03acb91> open_for_data+0xb6/0x331   <c02827d0> kobject_get+0xf/0x13
 <c027abc6> get_disk+0x62/0xbd   <c03aca28> cdrom_open+0x41/0xf4
 <c02827d0> kobject_get+0xf/0x13   <c03a5b1d> sr_block_open+0x69/0x9d
 <c0157a39> do_open+0xd8/0x2f2   <c015755e> bdget+0xed/0xfc
 <c0157469> bdev_set+0x0/0x8   <c0157d16> blkdev_open+0x25/0x5c
 <c0157cf1> blkdev_open+0x0/0x5c   <c014f5a8> __dentry_open+0xd8/0x20a
 <c014f7e6> nameidata_to_filp+0x28/0x3b   <c014f725> do_filp_open+0x4b/0x4d
 <c0467e5b> do_page_fault+0x162/0x5b2   <c014fa02> do_sys_open+0x42/0xbb
 <c0102985> syscall_call+0x7/0xb
Code: 24 89 f0 ff 53 2c eb e6 53 89 c3 8b 40 0c 8b 00 8b 48 30 85 c9 75 02 5b c3
89 d8 ff d1 eb f8 83 ec 08 89 7
4 24 04 89 1c 24 89 c6 <8b> 40 0c 8b 00 8b 58 34 31 c0 85 db 75 0b 8b 1c 24 8b
74 24 04
 <6>note: mount[3328] exited with preempt_count 1


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