System crashes with Kernel panic EIP: kmap_atomic while creating LVM snapshot on Red Hat Enterprise Linux 5.4

Issue

System crashes with

Kernel panic EIP: [<c041cb08>] kmap_atomic+0x5c/0x7f SS:ESP 0068:f7253f0c

This appears to be occuring during "lvcreate --snapshot" as part of a backup script. Problem occurs since update to recent kernel 2.6.18-164.6.1.el5

Command used for re-creating the issue :

$lvcreate --snapshot --size 512M --name snaproot /dev/VolGroup1/lv0

Upon hard reboot, snapshot appears to exist under /dev/mapper . The crash appears to be repeatable - has occurred at each run of this backup script since the new kernel was booted.