Nouveau - Oct 2017 - [Bug 103284] New: Unable to handle kernel NULL pointer dereference on 4.13.0-1-sparc64-smp

https://bugs.freedesktop.org/show_bug.cgi?id=103284

            Bug ID: 103284
           Summary: Unable to handle kernel NULL pointer dereference on
                    4.13.0-1-sparc64-smp
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: theholyettlz at googlemail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 134850
  --> https://bugs.freedesktop.org/attachment.cgi?id=134850&action=edit
dmesg with oops

dmesg output attached.

I'll admit this is a somewhat bizarre hardware combination (PC GeForce 210
card
in a Sun Ultra 45), but it probably shouldn't Oops on a null pointer.

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like if we error out somewhere we never have before, and the attempt to
clean things up ends up using something that hasn't been initialized yet.
Can
you try booting with nouveau.debug=trace to see where we end up going wrong,
which should hopefully point out the bad piece of code wrt error recovery?

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--- Comment #2 from James <theholyettlz at googlemail.com> ---
Created attachment 134875
  --> https://bugs.freedesktop.org/attachment.cgi?id=134875&action=edit
debug.trace output from modprobe nouveau

Requested info attached -- taken from manually doing modprobe nouveau
debug=trace.

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
OK, so looks like it very successfully creates a GT214_DISP object, and then
proceeds to call nv50_display_create. This then does not trigger *any* further
traces, and errors out. It errors out before the dmac is initialized, and I
think something in the list head thing fails.

Now, as I recall, SPARC has 8k pages. You could try bumping some of those 4096
values up to 8192 and see if that magically makes it work, at least a little
(like the nouveau_bo_new).

If you're sufficiently interested, you could add a lot more prints
throughout
that file to see exactly what fails, and then try to resolve it.

It might be an uphill battle though - a bunch of stuff is tied to 4K pages, I
think.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
https://github.com/skeggsb/nouveau/commit/0f6081089699b9f882def35ebe2b1649e77b7688

I believe this patch should fix your crash, but won't help you get the board
running. If you want to do that, you'll need to figure out which thing is
failing.

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--- Comment #5 from James <theholyettlz at googlemail.com> ---
OK -- I'll try giving that a go some time this week. To be honest I'm no
too
bothered about actually getting this card working on an Ultra 45...

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #6 from Martin Peres <martin.peres at free.fr> ---
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