It says "File based locking initialization failed"
Try the --ignorelockingfailure argument.
I am not familiar with that and 'man lvdisplay' does not show it as an option. Google for that turns up more results. Is it used with e2fsck, I dont see it there either.
It's an option for most LVM commands. Do a "man lvdisplay" and look in the SYNOPSIS section. Apparently most options lvdisplay understands aren't actually listed in the OPTIONS section.
Thanks.
It does list out the volume information, what else should it do?