Created attachment 144123 [details]
example of artifacts

Distro: Manjaro
Kernel: 5.0.5
GPU: R9 380X

Reproducible with:
  Mesa: git (07745f94948)
  LLVM: 9 (359393)

Isn't reproducible with:
  Mesa: 19.0.3
  LLVM: 8

Parts of the screen randomly become corrupted for 1 or 2 frames. It's not a
rare event.
Doesn't happen when capturing and/or replaying with apitrace.
Doesn't happen when running OBS.

Happens on new Sirocco map, didn't test on other.

Sorry for the image quality - it was taken from video recorded with old phone,
the grey squares on a tree branch are the artifacts in question but they could
be completely different.

I'm using https://pkgbuild.com/~lcarlier/mesa-git/x86_64/ for mesa and llvm
builds.