[Bug 109949] [skl] Hard lockup (Freeze) after reset failure: GPU HANG: ecode 9:0:0x85dffffb

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109949

--- Comment #34 from Arcadiy Ivanov <arcadiy at ivanov.biz> ---
(In reply to Chris Wilson from comment #33)
> Do what exactly? Userspace hangs the GPU, the kernel detects the hung GPU,
> resets the hung GPU and if userspace keeps on doing so, kills the userspace.
> We can't magically fix userspace.

Chris, this is not what're discussing here. If it was the issue, nobody would
make a peep!

The issue isn't that userspace hangs GPU and GPU then kills userspace. The
issue is that userspace hangs the GPU AND ***kills the kernel***: GPU is hung,
but it's not the userspace that dies it's the kernel that gets completely
seized up - no IO, no interrupts. Everything dies.

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