[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

Marta Löfstedt <marta.lofstedt at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|CLOSED                      |REOPENED

--- Comment #3 from Marta Löfstedt <marta.lofstedt at intel.com> ---
I was to quick to close this one:
The issue has started again on CI_DRM_3172 and forward

[   85.488531] ======================================================
[   85.488534] WARNING: possible circular locking dependency detected
[   85.488537] 4.14.0-rc3-CI-CI_DRM_3172+ #1 Tainted: G     U         
[   85.488539] ------------------------------------------------------
[   85.488542] prime_mmap/1588 is trying to acquire lock:
[   85.488544]  (cpu_hotplug_lock.rw_sem){++++}, at: [<ffffffff8109e5a7>]
apply_workqueue_attrs+0x17/0x50
[   85.488552] 
               but task is already holding lock:
[   85.488555]  (&dev_priv->mm_lock){+.+.}, at: [<ffffffffa01b2dfa>]
i915_gem_userptr_init__mmu_notifier+0x14a/0x270 [i915]
[   85.488589] 
               which lock already depends on the new lock.

It is very weird that this lockdep wasn't caught on CI_DRM_3170 CI_DRM_3171.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3172/shard-snb5/igt@prime_mmap@test_userptr.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3172/shard-hsw5/igt@prime_mmap@test_userptr.html

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