mount.cifs task fails to freeze during suspend; suspend fails

I have a CIFS mount and am operating over wireless on a Lenovo X230 Tablet Thinkpad
When I close the lid to sleep, the sleep light flashes for a while and then stops, and the machine fails to suspend. Same if I try to initiate sleep from the menus.

/var/log/kern.log is attached.

This is bad because it can lead to damage from overheating of hardware (let alone running out of battery). I close my lid and don't usually check for success before putting it into my bag. If it fails to suspend, it will overheat.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: samba 2:4.1.6+dfsg-1ubuntu2
Uname: Linux 3.14.0-031400-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CIFSMounts: Error: command ['mount', '|', 'grep', 'cifs'] failed with exit code 1: mount: only root can do that
CurrentDesktop: Unity
Date: Mon May 5 07:44:15 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-03-11 (54 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140218)
SambaClientRegression: Yes
SourcePackage: samba
UpgradeStatus: No upgrade log present (probably fresh install)