Hardware:
Radeon R9 290X (Hawaii)

Installed components:
Linux 4.11.9
Libdrm 2.4.81
Mesa 17.1.4

Running Arch Linux, using both radeon and amdgpu drm drivers, Chromium and
Firefox the system can freeze when running WebGL shaders. I've experienced this
on shadertoy.com before and now have a reproducible example:

https://threejs.org/examples/webgl_gpgpu_protoplanet.html

Sound keeps on playing and I can move the cursor but not interact with the
system any more. If I can provide any logs to help, please ask.