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SubjectKernel error during "umount" on ext3 with 2.4.15-pre7

I got the following error from the kernel:

Unable to handle kernel paging request at virtual address 4bbdc8fd
printing eip:
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[add_wait_queue_exclusive+28/36] Tainted: P EFLAGS:
eax: d76512a0 ebx: 4bbdc8fd ecx: 00000202 edx: c1cebe68
esi: c1cebe60 edi: c1cea000 ebp: cd1d04d0 esp: c1cebe48
ds: 0018 es: 0018 ss: 0018
Process umount (pid: 7461, stackpage=c1ceb000)
Stack: d7651294 c1cebe60 c0105949 c13532c0 00000000 00000000 00000001
c1cea000 d76512a0 4bbdc8fd c0105aa8 d7651294 00000000 d7651200
c01d26f5 c13532c0 00000000 00000000 cd1d04d0 ce271f18 00000001
c01126b0 c014cd12 d7651200 Call Trace: [__down+65/156]
[__down_failed+8/12] [stext_lock+4133/10892] [schedule+548/852]
[ext3_flushpage+34/40] charon kernel: [do_flushpage+25/44]
[truncate_complete_page+19/72] [truncate_list_pages+254/352]
[truncate_inode_pages+67/108] [dispose_list+50/84]
[invalidate_inodes+91/104] [kill_super+167/316] [__mntput+30/36]
[path_release+39/44] [sys_umount+167/180] [sys_munmap+53/84]
[sys_oldumount+12/16] [system_call+51/56] Code: 89 13 51 9d 5b 5e c3 90
9c 58 fa 8b 4a 0c 8b 52 08 89 4a 04
This error occured during the execution of the "umount" command from
the following script:

LIST="bin boot dev etc lib opt root sbin usr var"
mount /backup
# System Backup
for d in $LIST; do
/usr/bin/rsync -ax --delete /$d/ /backup/$d/
# Home Backup
/usr/bin/rsync -ax --delete --exclude-from=/etc/rsync/exclude /home/
umount /backup

My fstab looks like:

/dev/hda5 / ext3 defaults,errors=remount-ro
0 1
/dev/hda6 none swap sw
0 0
proc /proc proc defaults
0 0
/dev/fd0 /floppy auto defaults,user,noauto
0 0
/dev/hdd /cdrom iso9660 defaults,ro,user,noauto
0 0
/dev/scd0 /cdrw iso9660 defaults,ro,user,noauto
0 0
/dev/hda1 /boot ext3 rw
0 2
/dev/hdb1 /backup ext3 rw,noauto
0 2
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