Nouveau - Nov 2013 - [Bug 71824] [NVE6] NULL deref on boot when there is nothing in DCB on 3.13-rc

https://bugs.freedesktop.org/show_bug.cgi?id=71824

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[HSW mobile                 |[NVE6] NULL deref on boot
                   |Regression]System booting   |when there is nothing in
                   |with Call Trace             |DCB on 3.13-rc

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like you have no outputs. I think this will lead to

    chan->vblank.nr_event = pdisp->vblank->index_nr;

failing in nv50_software_context_ctor, called from nouveau_accel_init since
pdisp->vblank == NULL. I suspect that ->index_nr is at offset 0x130 which
explains the CR2 that you see.

As a temporary workaround, booting with nouveau.noaccel=1 will avoid the crash
(and also remove your ability to use the card).

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