Created attachment 124508 [details]
GALLIUM_DDEBUG="800 noflush" dump

I tried to record an apitrace but could not get any lockups while recording or
glretracing the traces. I also was not able to get a hang while using
GALLIUM_DDEBUG="800" without noflush. Maybe the hang is framerate related, or
at least much less likely to occur at really low framerates?

However, I did reproduce a hang while using GALLIUM_DDEBUG="800 noflush".
Attached is the ddebug dump, not sure if it will be of any use.

Mesa 12.1.0-devel (git-a048047)
LLVM r272544