If you getting following message during drbd startup:
Starting DRBD resources:DRBD module version: 8.3.11
userland version: 8.3.9
you should upgrade your drbd tools!
You can use that updated package:
http://desunote.ru/pub/drbd8-utils_8.3.11-0_amd64.deb (Use at your own risk).
I have just applied debian patches to current vanilla drbd 8-8.3.11, and I really hope I have not broken anything.
PS Страх и ужас.