Bug 109956 - [CI][DRMTIP] igt@kms_plane@plane-panning-bottom-right-suspend-pipe-c-planes - dmesg-warn- WARNING: possible circular locking dependency detected/(&dev->struct_mutex)/(&mm->mmap_sem)
Summary: [CI][DRMTIP] igt@kms_plane@plane-panning-bottom-right-suspend-pipe-c-planes -...
Status: RESOLVED DUPLICATE of bug 109385
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
Whiteboard: ReadyForDev
Depends on:
Reported: 2019-03-11 07:50 UTC by Lakshmi
Modified: 2019-03-13 08:36 UTC (History)
1 user (show)

See Also:
i915 platform: BSW/CHT
i915 features: power/runtime PM


Description Lakshmi 2019-03-11 07:50:12 UTC

<4> [61.382525] ======================================================
<4> [61.382528] WARNING: possible circular locking dependency detected
<4> [61.382532] 5.0.0-rc5-g041ba1d6aa0f-drmtip_216+ #1 Tainted: G     U           
<4> [61.382535] ------------------------------------------------------
<4> [61.382538] kms_plane/1072 is trying to acquire lock:
<4> [61.382542] 00000000e7bea55b (&dev->struct_mutex){+.+.}, at: i915_gem_fault+0x1f8/0x850 [i915]
<4> [61.382656] 
but task is already holding lock:
<4> [61.382658] 00000000c73dd26a (&mm->mmap_sem){++++}, at: __do_page_fault+0x133/0x500
<4> [61.382668] 
which lock already depends on the new lock.
Comment 1 CI Bug Log 2019-03-11 08:03:47 UTC
The CI Bug Log issue associated to this bug has been updated.

### New filters associated

* BSW : igt@kms_plane@plane-panning-bottom-right-suspend-*-dmesg-warn- WARNING: possible circular locking dependency detected/(&amp;dev-&gt;struct_mutex)/(&amp;mm-&gt;mmap_sem) (No new failures associated)
Comment 2 Chris Wilson 2019-03-11 08:37:28 UTC

*** This bug has been marked as a duplicate of bug 109385 ***
Comment 3 Lakshmi 2019-03-13 08:36:12 UTC
The reason why I have created a separate bug is that, assuming acquire and holding lock in this issue is different from the original Bug 109385.

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