I'm not sure where to report this, but I thought this was
something important to report, because AFAIK there are plans
to make 220.127.116.11 move to F-12 updates-testing.
Today I compiled my own F-12 18.104.22.168 kernel from pkg-CVS, as
I was working on rebasing the gspca driver in there to the latest
upstream (as a lot of really good to have fixes and new hardware
support has accumulated upstream).
When rebooting into my kernel (stock pkg-cvs + rebased gspca,
which at that time did not even load as no webcam was plugged in),
X failed to start (segfault).
After upgrading all xorg + libdrm + mesa packages to rawhide this was fixed.