[Bug 107065] "BUG: unable to handle kernel paging request at 0000000000002000" at amdgpu_vm_cpu_set_ptes at S3 resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107065

--- Comment #7 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Andrey Grodzovsky from comment #6)
> So with Arch Linux kernel it happens only during S3 but with
> amd-staging-drm-next it happens once you start X ?

Yes. I know it sounds strange, but it's currently 100% reproducible to me:

Booting linux-4.17.2-ARCH with amdgpu.vm_update_mode=0:
 X11 starts fine, but system crashes after minutes of firefox browsing

Booting linux-4.17.2-ARCH with amdgpu.vm_update_mode=3:
 X11 starts fine, system does not crash (for at least hours of use)
 but crashes as above if resumed from S3 sleep

Booting linux compiled from amd-staging-drm-next, as of commit
527d6e839a0e52b744fd092453544e4f58977334 from yesterday, with
amdgpu.vm_update_mode=0:
 X11 starts fine, but system crashes after minutes of firefox browsing

Booting linux compiled from amd-staging-drm-next, as of commit
527d6e839a0e52b744fd092453544e4f58977334 from yesterday, with
amdgpu.vm_update_mode=3:
 X11 does not start, crashes immediately with the same above pasted kernel BUG
message and backtrace


So something with CPU-based vm_update_mode is broken, but in a different way
than the SDMA-based method.

I will change the subject of this report to reflect that this crash is not
necessarily S3-resume-related.

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