[Bug 88433] [all Bisected]igt/drv_module_reload causes major memory corruption and system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88433

--- Comment #6 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Ander Conselvan de Oliveira from comment #5)
> (In reply to Jani Nikula from comment #4)
> > Please always assign to bisected bad commit author! I'm also CC'ing Ander
> > for being the reviewer.
> > 
> > At a very quick glance, only intel_plane_duplicate_state looks suspicious.
> > Is plane->state always valid when non-NULL?
> > 
> > Matt, Ander?
> 
> It should, but maybe I missed something in the review. But the error
> checking in intel_plane_duplicate_state() and callers seems to be correct.
> Perhaps the bug is in the plane helpers.

Actually the problem is somewhere with intel_plane_destroy.
intel_plane_state_destroy doesn't set the plane to NULL and then something bad
happens when drm_plane_cleanup tries to destroy it again.

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