(In reply to comment #13)
> (In reply to comment #12)
> > Created attachment 98501 [details] [review] [review] [review]
> > Possible fix.
> > 
> > Please try the attached kernel patch.
> > 
> > Only tested with 3.15-rc2, but should apply to 3.14 as well.
> 
> Thanks, it applies to 3.13 as well, but still same issue :(
> 
> Exactly same crash (http://paste.ubuntu.com/7405255/) and dmesg
> (http://paste.ubuntu.com/7405259/)

Mhm, your dmesg looks like you are still booting the standard Ubuntu kernel:
[    0.000000] Linux version 3.13.0-24-generic (buildd@batsu) (gcc version
4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014
(Ubuntu 3.13.0-24.47-generic 3.13.9)

Grub usually selects the kernel with the highest version number for boot.
Please double check that you selected the self compiled version in grub while
booting.