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Subject2.5.32 oops on unmount of ext2 filesystems
I get following oops while unmounting ext2 filesystems. I have not seen
this on 2.5.31. Is this a known problem ?

(I have 200 ext2 filesystems on 40 disks, I got one oops per filesystem
- all looks same).


<1>Unable to handle kernel NULL pointer dereference at virtual address 0000001c
*pde = 00000000
Oops: 0000
CPU: 4
EIP: 0060:[<c01e1e34>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010202
eax: 00000000 ebx: c872c800 ecx: c12bf860 edx: 00000000
esi: 00000001 edi: 00000000 ebp: f6e5c5e8 esp: efef5ea0
ds: 0068 es: 0068 ss: 0068
Stack: c01e1a27 00000000 00000296 cdc4da80 00000000 efef5ecc c872c800 f6e5c5c0
c0349180 c872c800 c017d685 00000001 00000001 f6e5c5e8 c01501a2 cdc4daf0
cdc4daf0 c0150458 00000000 c017c609 c872c800 cffd3400 c01505ac efef5f00
Call Trace: [<c01e1a27>] [<c017d685>] [<c01501a2>] [<c0150458>] [<c017c609>]
[<c01505ac>] [<c0140d8f>] [<c01415b2>] [<c0140bf6>] [<c0152858>] [<c0146119>]
[<c0152fe0>] [<c0128dc5>] [<c0152ffc>] [<c0107643>]
Code: 8b 40 1c c3 90 8d b4 26 00 00 00 00 53 8b 5c 24 08 8d 8b 98

>>EIP; c01e1e34 <bdev_get_queue+4/10> <=====
Trace; c01e1a27 <ll_rw_block+27/1a0>
Trace; c017d685 <ext2_sync_super+35/60>
Trace; c01501a2 <destroy_inode+32/50>
Trace; c0150458 <dispose_list+48/60>
Trace; c017c609 <ext2_put_super+29/90>
Trace; c01505ac <invalidate_inodes+7c/90>
Trace; c0140d8f <generic_shutdown_super+9f/150>
Trace; c01415b2 <kill_block_super+12/30>
Trace; c0140bf6 <deactivate_super+46/90>
Trace; c0152858 <__mntput+18/30>
Trace; c0146119 <path_release+29/30>
Trace; c0152fe0 <sys_umount+60/70>
Trace; c0128dc5 <sys_munmap+35/60>
Trace; c0152ffc <sys_oldumount+c/10>
Trace; c0107643 <syscall_call+7/b>
Code; c01e1e34 <bdev_get_queue+4/10>
00000000 <_EIP>:
Code; c01e1e34 <bdev_get_queue+4/10> <=====
0: 8b 40 1c mov 0x1c(%eax),%eax <=====
Code; c01e1e37 <bdev_get_queue+7/10>
3: c3 ret
Code; c01e1e38 <bdev_get_queue+8/10>
4: 90 nop
Code; c01e1e39 <bdev_get_queue+9/10>
5: 8d b4 26 00 00 00 00 lea 0x0(%esi,1),%esi
Code; c01e1e40 <blk_remove_plug+0/50>
c: 53 push %ebx
Code; c01e1e41 <blk_remove_plug+1/50>
d: 8b 5c 24 08 mov 0x8(%esp,1),%ebx
Code; c01e1e45 <blk_remove_plug+5/50>
11: 8d 8b 98 00 00 00 lea 0x98(%ebx),%ecx

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