[Bug 101998] X server 1.19.3 failure with amdgpu (radeon M295X) on Ubuntu HWE16.04 kernel 4.10.0-28

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101998

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |agoins at nvidia.com
           Assignee|xorg-driver-ati at lists.x.org |xorg-team at lists.x.org
          Component|Driver/AMDgpu               |Driver/modesetting

--- Comment #37 from Michel Dänzer <michel at daenzer.net> ---
I was able to reproduce the problem. It's a modesetting driver bug, this code
in ms_dirty_update:

            msPixmapPrivPtr ppriv =
                msGetPixmapPriv(&ms->drmmode, ent->slave_dst);

probably needs to be:

            msPixmapPrivPtr ppriv =
                msGetPixmapPriv(&ms->drmmode, ent->slave_dst->master_pixmap);

otherwise it tries to access random memory when the slave screen doesn't use
the modesetting driver.

There might be more related issues.

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