[Bug 204181] NULL pointer dereference regression in amdgpu

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https://bugzilla.kernel.org/show_bug.cgi?id=204181

--- Comment #9 from Sergey Kondakov (virtuousfox@xxxxxxxxx) ---
(In reply to Nicholas Kazlauskas from comment #1)
> Do you mind posting an dmesg log with drm=debug=4 as part of your boot
> parameters?
> 
> An xorg log would be good too if applicable.
> 
> I'm curious to know what the actual sequence / system setup is for
> reproducing this as this isn't really a typical sequence. I think you'd run
> into other NULL pointer dereferences even if this one is guarded.
> 
> I think the stream itself is NULL and it shouldn't be in the context.

I don't think that putting 'drm=debug=4' into boot cmd has changed anything but
here's some more data. I also stumbled into another baffling regression (bug
#203703) recently (from 5.0 to 5.1) concerning network packet scheduling
(fq_codel qdics) that halts affected Ethernet device, it also gives out
repeatable kernel trace on random network activity unless qdics is changed on
dumb "pfifo_fast" early on, similarly how this gives out same repeatable amdgpu
trace on some random GPU activity. Weird.

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