[Bug 203111] Unrecoverable GPU crash with DiRT 4

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203111

--- Comment #4 from Alex Deucher (alexdeucher at gmail.com) ---
(In reply to Thomas from comment #3)
> 
> Are you sure this could be a mesa bug? Just asking cause for me a hanging
> kernel sounds like a kernel bug.

Likely a mesa bug.  Mesa submits gfx/video/compute jobs to the kernel driver. 
If there are subtle bugs in those jobs, the GPU can hang.  The kernel driver
can reset the GPU, but the display server needs to catch the reset and properly
re-initialize it's context and buffers.  At the moment, none of the display
servers do this so you need to restart them after a GPU reset.

The:
[drm:amdgpu_cs_ioctl] *ERROR* Failed to initialize parser -125!
error is because userspace tried to submit more work to the kernel after a
reset without re-initializing it's context, so the kernel rejects it.

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