[Bug 89166] New: [ivb] mutex deadlock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89166

            Bug ID: 89166
           Summary: [ivb] mutex deadlock
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

[  600.562671] INFO: task kworker/u32:5:99 blocked for more than 120 seconds.
[  600.562691]       Not tainted 3.19.0+ #251
[  600.562694] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[  600.562697] kworker/u32:5   D ffff88009c183c98     0    99      2 0x00000000
[  600.562710] Workqueue: i915 intel_unpin_work_fn
[  600.562716]  ffff88009c183c98 ffff8802561c4010 ffff88009c122010
ffff88009c183c68
[  600.562726]  ffffffff8157c84e ffff88009c183cc8 ffff88009c183fd8
ffff880255bef864
[  600.562736]  ffff88009c122010 00000000ffffffff ffff880255bef868
ffff88009c183cb8
[  600.562746] Call Trace:
[  600.562753]  [<ffffffff8157c84e>] ? schedule_preempt_disabled+0xe/0x10
[  600.562760]  [<ffffffff8157c787>] schedule+0x37/0x90
[  600.562765]  [<ffffffff8157c84e>] schedule_preempt_disabled+0xe/0x10
[  600.562769]  [<ffffffff8157e553>] __mutex_lock_slowpath+0x93/0x100
[  600.562773]  [<ffffffff8157e5db>] mutex_lock+0x1b/0x30
[  600.562778]  [<ffffffff813d5a73>] intel_user_framebuffer_destroy+0x23/0xa0
[  600.562783]  [<ffffffff8135e58e>] drm_framebuffer_free+0x4e/0x60
[  600.562788]  [<ffffffff8135eed5>] drm_framebuffer_unreference+0x35/0x70
[  600.562792]  [<ffffffff813d62e8>] intel_unpin_work_fn+0x68/0x150
[  600.562797]  [<ffffffff810a054d>] process_one_work+0x14d/0x410
[  600.562802]  [<ffffffff810a087b>] worker_thread+0x6b/0x470
[  600.562806]  [<ffffffff810a0810>] ? process_one_work+0x410/0x410
[  600.562810]  [<ffffffff810a5e2b>] kthread+0xdb/0x100
[  600.562814]  [<ffffffff810a5d50>] ? __kthread_parkme+0x90/0x90
[  600.562818]  [<ffffffff815805ac>] ret_from_fork+0x7c/0xb0
[  600.562822]  [<ffffffff810a5d50>] ? __kthread_parkme+0x90/0x90

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