[Bug 103096] New: [CI] igt at kms_addfb_basic@bad-pitch-0 - dmesg-warn - possible circular locking dependency detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103096

            Bug ID: 103096
           Summary: [CI] igt at kms_addfb_basic@bad-pitch-0 - dmesg-warn -
                    possible circular locking dependency detected
           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: marta.lofstedt at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On CI_DRM_3167 all shards dmesg-warn on lockdep:        

[   56.872627] ======================================================
[   56.872629] WARNING: possible circular locking dependency detected
[   56.872632] 4.14.0-rc3-CI-CI_DRM_3167+ #1 Tainted: G     U         
[   56.872634] ------------------------------------------------------
[   56.872637] kms_addfb_basic/1462 is trying to acquire lock:
[   56.872639]  (&dev->struct_mutex){+.+.}, at: [<ffffffffa01cc7d1>]
i915_mutex_lock_interruptible+0x51/0x130 [i915]
[   56.872680] 
               but task is already holding lock:
[   56.872682]  (&mm->mmap_sem){++++}, at: [<ffffffff8104adad>]
__do_page_fault+0x10d/0x570
[   56.872687] 
               which lock already depends on the new lock.

[   56.872690] 
               the existing dependency chain (in reverse order) is:

Note, this is not reproduced on CI_DRM_3168 nor CI_DRM_3169

Full data:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3167/shard-snb6/igt@kms_addfb_basic@bad-pitch-0.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3167/shard-hsw3/igt@kms_addfb_basic@bad-pitch-0.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3167/shard-apl5/igt@kms_addfb_basic@bad-pitch-0.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3167/shard-kbl6/igt@kms_addfb_basic@bad-pitch-0.html

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