Comment # 6 on bug 106418 from Michel Dänzer

(In reply to davep from comment #5)
> My name's Dave Panariti (david.and I'm going to be taking a look at this.

Thanks for looking into this, Dave. After hitting the BUG_ON again this week, I
got fed up, took a closer look, and I think I found the problem here. This
patch should fix it:

https://patchwork.freedesktop.org/patch/231303/