no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Newly installed Ubuntu 14.04 server and samba on a new PC.
When I was trying to create an array by execute the mdadm command with sudo, I got this error message:

no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory

Somehow, the sudo command was successfully completed, but the error message is annoying. I was thinking this maybe a mdadm bug, but after tried some other commands – I found each time when I was execute a command with sudo I got this error message. Weird! After googling around I found some pages relating to this problem. Looks like this seems to be a issue with samba and libpam-smbpass?
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