[Bug 91906] [ILK] With Linux 4.2 Xorg can't start, then kernel module crash, then system completely freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91906

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
The trigger is the TIMESTAMP probe inside mesa, using the reg_read_ioctl. That
for some reason is causing a soft lockup inside the reader, so I presume it is
the retry if unstable logic? If you revert:

commit ee0a227b7ac6e75f28e10269f81c7ec6eb600952
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Jul 15 09:50:42 2015 +0100

    drm/i915: Replace WARN inside I915_READ64_2x32 with retry loop

does the system recover?

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