(In reply to MWATTT from comment #5)
> However, one of them starts to hang with an earlier commit:
> edbbfac6cfc634e697d7f981155a5072c52d77ac
> "r600g: fast color clears for single-sample buffers"
> 
> This only happens on evergreen+ hardware(tested on JUNIPER and THAMES, works
> fine on RV770).
> 
> A workaround is to set the environment variable R600_DEBUG=notiling.

Fast clears only work with tiled surfaces, so R600_DEBUG=notiling makes the
commit above ineffective. Adding the author of that commit to CC.