[CentOS] ecryptfs (from centosplus) and libvirt lxc quest on it - quest upon start shoots host in the head

hi guys

I have a lxc guest on Dell's R815(AMD Opterons) which I just moved to an 
ecryptfs mounted folder(using centosplus' kernel)

Copying data to that folder seems to work just fine, but I as soon as I 
start the quest the host gets shot in the head, hard reboot, no dump.

I also have another, virtually identical guest but on Intel platform and 
that one does not do anything but runs okey.

Any of you guys has experience such gross abnormality?

many thanks, L.