[Bug 99977] [SNB] [i915] GPU HANG: ecode 6:0:0x85fffffc, in aquaria [2893], reason: Hang on render ring, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99977

--- Comment #15 from Jan Nordholz <jckn at gmx.net> ---
Re #12:
Cannot find reservation_object_trylock() in drm-tip or in Linus' master.
Extrapolated from the declarations of <reservation.h> and <ww_mutex.h> that the
intention was (please correct if I'm wrong):

if (reservation_object_lock(resv, NULL) == 0) { /* lock successfully acquired
*/
  ...
}

Tested that, hard freeze persists.

Re #14:
Not sure, just pulled it out of the closet again. Played it years ago, but the
kernels I ran back then didn't have IOMMU compiled in, if I remember correctly.
I'll happily bisect this - what would be a good guess for how far to go back?

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