lvremove on snapshots created with lvm2 can't be deleted. lvremove asks if you wan't to remove, answer yes, the process hangs indefinitly no other lvxyz will respond after that and the system will not reboot, as it hangs while shutdown. However the system will come up after hard reset and if the snapshotted volume is inactive, the snapshot can be removed. Tried to use lvm2.02.05 but that had problems with the snapshot ("Unrecognised segment type snapshot", altough explicitly compiled with that USE flag) Kernel 2.6.16-xen with dm_ stuff compiled as modules
Newer lvm2 should fix this issue....