Comment 58 for bug 1053959

(In reply to comment #53)
> Oct 17 13:37:25 lap-x201 kernel: [266534.112127]
> [drm:drm_gem_create_mmap_offset] *ERROR* failed to allocate offset for bo 0
>
> I've started syslogging the number of inactive objects to see if it reaches
> the same kind of heights. I've also logged a bug on Launchpad, so we can see
> whether a new driver release is needed in Ubuntu:
>
> https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/

Could be this bug as the attached Xorg.log there indicates you are using 2.17.0 (I'd like to see your Xorg.log with 2.20.x if you have it, just to confirm) or it could just be a client pixmap leak. So also watch xrestop.
> 1053959