[Bug 102939] [CI][SNB,HSW,APL,KBL] igt at prime_mmap@test_userptr - possible circular locking dependency detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102939

--- Comment #9 from Marta Löfstedt <marta.lofstedt at intel.com> ---
"commit 7741b547b6e000b08e20667bb3bef22e1a362661
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Oct 9 18:44:00 2017 +0200

    drm/i915: Preallocate our mmu notifier workequeu to unbreak cpu hotplug
deadlock"

was integrated in CI_DRM_3202. From then the lockdep in 
igt at prime_mmap@test_userptr has not been reproduced. Note that this is not due
it being hidden by another lockdep, in for example:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3202/shard-apl3/igt@prime_mmap@test_userptr.html
there is no lockdep either in bootlog or runtime dmesg.
The same is true for:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3202/shard-kbl5/igt@gem_userptr_blits@process-exit-gtt.html.
>From which I draw the conclusion that all the gem_userptr_blits lockdeps are
fixed by above commit.

However, the gem_eio lockdep is still present, see for example: 
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3202/shard-kbl7/igt@gem_eio@throttle.html.
Also, this is still present:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3202/shard-hsw2/igt@kms_frontbuffer_tracking@fbc-1p-primscrn-cur-indfb-draw-render.html

>From this I (again) draw the conclusion that this is not a duplicate BUG
102886.

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