This problem related to the samba PAM module.

You have 2 solution at all.

Solution 1#: Remove it( as described below )

$ sudo apt-get remove libpam-smbpass

Solution 2#: Fix it( as described below )
Update your PAM authentication module by the following code and remove "SMB password synchronization"

$ pam-auth-update

References :
[1] http://ubuntuforums.org/showthread.php?t=2214042
[2] https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1257186

"no talloc stackframe at ../source3/param/loadparm.c:4864, leaki