[linux-lvm] workaround for RHEL4 + LVM2 inactive snapshot kernel panic

[Rob Ostrander]

It seems RHEL4's latest kernel and device-mapper have a bug which causes 
a kernel panic when an a snapshot gets *filled*, marked as inactive and 
then removed.  This is a known bug and fixed in later kernels but RHEL 
is a few versions behind...
What would you suggest to get around this issue?
Is there any overhead for keeping inactive snapshot LVs around?