2.5.45: raid oops

Hi,
With 2.5.45 (with the device mapper patches to get lvm to build on
2.5.45) when I start raid I get the following oops (its raid1 on ide hda, hdg):

md: could not lock hda4.
md: could not import hda4!

Unable to handle kernel NULL pointer dereference at virtual address

00000004
printing eip:
c028da27
*pde = 00000000

Oops: 0000

CPU:    0
EIP:    0060:[<c028da27>]    Not tainted
EFLAGS: 00010246

EIP is at export_rdev+0x7/0x90
eax: 0000001e ebx: fffffff0 ecx: ffff8000 edx: 00000000
esi: 00000304 edi: 00000000 ebp: 00000304 esp: dccb3ee0
ds: 0068 es: 0068 ss: 0068
Process raidstart (pid: 264, threadinfo=dccb2000 task=dcc6b7c0)

Stack: fffffff0 c028f081 fffffff0 00000304 df757a04 00000000 dfcb8200
c028f8d7
       00000304 00000931 00000304 dfd17484 dfcb8400 df711e5c dccb3f1c
00000304
       00000000 00000000 0008f331 000061b0 00000001 00000000 00000006
00000304
Call Trace:
 [<c028f081>] autostart_array+0x101/0x110
 [<c028f8d7>] md_ioctl+0xe7/0x520
 [<c023f30a>] blkdev_ioctl+0x39a/0x3d0
 [<c0160b61>] sys_ioctl+0x271/0x2e8
 [<c0107617>] syscall_call+0x7/0xb

Code: 8b 43 14 85 c0 74 04 0f b7 50 10 52 e8 68 23 ef ff 83 c4 04

Dave
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