Hi
----- Original Message -----
> > I wonder if xf86-video-modesetting will reach the same crash now (since it
> > also has no crtc->driverIsPerformingTransform).
>
> So, I guess I'm missing some context here, but in xf86CrtcScreenInit()
> if those two hooks are not implemented, it should only expose support
> for zero degree rotation (ie. rotation not supported).. what crash
> are you seeing?
In modesetting and qxl drivers, drmmode_set_mode_major() is calling xf86CrtcRotate().
But xf86CrtcRotate() calls crtc->funcs->shadow_{destroy,allocate}() without
NULL checking in some situations and SEGV happens. See also patch with
some reference to the bug: https://freedesktop.org/patch/32869/
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