[Bug 83677] [HSW] GPU hang on ctx load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83677

--- Comment #30 from Simon Farnsworth <simon at farnz.org.uk> ---
(In reply to comment #28)
> Could you get drm.debug=7 dmesg for the BUG()? I don't it will give anything
> else, but maybe it will have a nugget of gold in there. Best would slub
> debug=y (use-after-free checks) or even kmemcheck.

I've turned on slub debug, but drm.debug=7 dmesg flows too fast to send over
netconsole, with lots of repeats of:

[  164.320029] [drm:legacy_ringbuffer_submission] UXA submitting garbage DR4,
fixing up
[  164.320055] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_BUSY
[  164.320056] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_MADVISE
[  164.320060] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_MADVISE
[  164.320062] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_PWRITE
[  164.320064] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_PWRITE
[  164.320066] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_BUSY
[  164.320067] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_MADVISE
[  164.320069] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1, I915_GEM_PWRITE
[  164.320071] [drm:drm_ioctl] pid=888, dev=0xe200, auth=1,
I915_GEM_EXECBUFFER2

If I hit the BUG() again, I'll give you whatever I can get.

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