https://bugzilla.kernel.org/show_bug.cgi?id=101261
--- Comment #2 from Beau V.C. Bellamy bellamy.beau@gmail.com --- When unbinding the radeon driver from a second GPU in order to bind to the vfio-pci driver (so it can be used on a virtual machine), the linux kernel will display several warnings. It looks like some resources may be double-freed. The GPU will otherwise work flawlessly in the VM with full acceleration on the stock AMD windows drivers.
This actually shows up on all kernels that I've tried: 4.1.0, 3.19, 3.18, etc.
I'm not sure it's related, but the first GPU when running X on the host will have some difficulties getting OpenGL working (I have a routine that involves a dance with glxgears and firefox) and will work for some time and then take the entire system down hard. If I avoid anything OpenGL/DRM, the system will run indefinitely.