[Bug 102939] New: [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

            Bug ID: 102939
           Summary: [CI][SNB,HSW,APL,KBl] igt at prime_mmap@test_userptr -
                    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

>From CI_DRM_3118 on SNB-, HSW-, APL- and KBL-shards:
new test: igt at prime_mmap@test_userptr: 

[   29.531667] ======================================================
[   29.531670] WARNING: possible circular locking dependency detected
[   29.531673] 4.14.0-rc1-CI-CI_DRM_3119+ #1 Tainted: G     U         
[   29.531676] ------------------------------------------------------
[   29.531679] prime_mmap/1521 is trying to acquire lock:
[   29.531681]  (cpu_hotplug_lock.rw_sem){++++}, at: [<ffffffff8109dbb7>]
apply_workqueue_attrs+0x17/0x50
[   29.531691] 
               but task is already holding lock:
[   29.531694]  (&dev_priv->mm_lock){+.+.}, at: [<ffffffffa0151b2a>]
i915_gem_userptr_init__mmu_notifier+0x14a/0x270 [i915]
[   29.531742] 
               which lock already depends on the new lock.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3118/shard-snb4/igt@prime_mmap@test_userptr.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3118/shard-hsw6/igt@prime_mmap@test_userptr.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3118/shard-apl2/igt@prime_mmap@test_userptr.html
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3118/shard-kbl3/igt@prime_mmap@test_userptr.html

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