Hi Daniel, this showed up in drm-next on my radeon and udl drivers, I haven't bisected it yet, it may not even be your fault :-)
if (WARN_ON(!list_empty(&work->entry))) { is the line in the workqueue code. Dave. -------------- next part -------------- A non-text attachment was scrubbed... Name: mydmesg Type: application/octet-stream Size: 22820 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20130628/6591b7ed/attachment-0001.obj>