[Bug 93460] [amdgpu] Ooops during shutdown - amdgpu_vm_grab_id

https://bugs.freedesktop.org/show_bug.cgi?id=93460

--- Comment #6 from david1.zhou@amd.com david1.zhou@amd.com --- (In reply to Christian König from comment #5)

(In reply to Mike Lothian from comment #4)

...

When this happens my machine just freezes, the only way to continue is to press and hold the power button but that doesn't cleanly unmount the disks

Yeah, that is clearly a bug when the driver unloads.

Probably rather hard to reproduce, we should add a test case which loads and unloads the driver multiple times while there is load.

Maybe we shall avoid to use fence for vmid, instead using LRU list.