https://bugs.freedesktop.org/show_bug.cgi?id=110635
--- Comment #7 from tempel.julian@gmail.com --- The OGL issue occurs with both LLVM 8 and 9-git, so there might not be a connection to your radv issue here. I suppose LLVM 9 would also be fine with AMD_DEBUG=nodma & radeonsi, which indicates that the bug really is in the async DMA code of radeonsi (or at least triggers it).
I also would suppose that RADV_PERFTEST= doesn't have to know the same values like AMD_DEBUG=, which afaik applies only to radeonsi.