[Nouveau] [Bug 91632] Assert in nouveau_pushbuf_data

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91632

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Allan Sandfeld from comment #2)
> The original qtwebengine bug is at
> https://bugreports.qt.io/browse/QTBUG-41242
> 
> One interesting thing I discovered was that using the EGL/GLES mode instead
> of GLX/GL solved the issue. I assume at your level it shouldn't be that
> different. So it could be a difference in how EGL vs GLX acts.

The issue was happening for me with Unigine Heaven run with DRI3 + DRI_PRIME=1.
Then I started running it with vblank_mode=0 and all my problems disappeared. I
haven't checked whether removing vblank_mode=0 would cause the issues to
reappear. I was happy to blame it on the DRI3 boogeyman and moved on (I tend
not to have a good grasp on these types of issues in the first place...
normally I wouldn't touch DRI3 but it really makes nouveau dev quite a bit
easier with a primary non-nvidia adapter since I can load/unload nouveau/nvidia
at will and still have things display on my regular screen).

Not sure how vsync would cause the problems, but I was getting actual shader
traps reported in dmesg. Do you (or whoever is having the issue) have that as
well?

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