[Bug 109956] New: [CI][DRMTIP] igt at kms_plane@plane-panning-bottom-right-suspend-pipe-c-planes - dmesg-warn- WARNING: possible circular locking dependency detected/(&dev->struct_mutex)/(&mm->mmap_sem)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109956

            Bug ID: 109956
           Summary: [CI][DRMTIP]
                    igt at kms_plane@plane-panning-bottom-right-suspend-pipe-
                    c-planes - dmesg-warn- WARNING: possible circular
                    locking dependency
                    detected/(&dev->struct_mutex)/(&mm->mmap_sem)
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lakshminarayana.vudum at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_216/fi-bsw-n3050/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-c-planes.html

<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.

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