[Bug 84041] New: I built my kernel with lockdep, and caught a possible deadlock while playing video using vdpau on radeon driver.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=84041

            Bug ID: 84041
           Summary: I built my kernel with lockdep, and caught a possible
                    deadlock while playing video using vdpau on radeon
                    driver.
           Product: Drivers
           Version: 2.5
    Kernel Version: Possible deadlock when using dri PRIME
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: yshuiv7@gmail.com
        Regression: No

dmesg:

[  166.768423] =============================================
[  166.768424] [ INFO: possible recursive locking detected ]
[  166.768429] 3.16.1 #7 Not tainted
[  166.768430] ---------------------------------------------
[  166.768432] Xorg.bin/319 is trying to acquire lock:
[  166.768435]  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8146efb3>]
i915_gem_unmap_dma_buf+0x33/0xd0
[  166.768461] 
but task is already holding lock:
[  166.768462]  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8143b382>]
drm_gem_object_handle_unreference_unlocked+0x102/0x130
[  166.768475] 
other info that might help us debug this:
[  166.768477]  Possible unsafe locking scenario:

[  166.768479]        CPU0
[  166.768480]        ----
[  166.768481]   lock(&dev->struct_mutex);
[  166.768483]   lock(&dev->struct_mutex);
[  166.768484] 
 *** DEADLOCK ***

[  166.768486]  May be due to missing lock nesting notation

[  166.768488] 1 lock held by Xorg.bin/319:
[  166.768489]  #0:  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8143b382>]
drm_gem_object_handle_unreference_unlocked+0x102/0x130
[  166.768493] 
stack backtrace:
[  166.768496] CPU: 0 PID: 319 Comm: Xorg.bin Not tainted 3.16.1-zen-v7+ #7
[  166.768499] Hardware name: LENOVO 20347/Lenovo Y40-70, BIOS 99CN24WW(V1.07)
07/28/2014
[  166.768500]  ffffffff825f02c0 ffff880098dcfae0 ffffffff8174e942
ffff88024f065fa0
[  166.768504]  ffff880098dcfbb0 ffffffff810ca996 ffff8802553b8e88
00000000fffff200
[  166.768506]  ffff880098dcfb20 ffffffff810c8abd ffff8802553b8ea8
ffff88024f066878
[  166.768510] Call Trace:
[  166.768520]  [<ffffffff8174e942>] dump_stack+0x4d/0x6f
[  166.768528]  [<ffffffff810ca996>] __lock_acquire+0x1b06/0x1fa0
[  166.768531]  [<ffffffff810c8abd>] ? trace_hardirqs_on_caller+0x15d/0x200
[  166.768534]  [<ffffffff810cb6a5>] lock_acquire+0x95/0x130
[  166.768537]  [<ffffffff8146efb3>] ? i915_gem_unmap_dma_buf+0x33/0xd0
[  166.768542]  [<ffffffff817538b3>] mutex_lock_nested+0x63/0x410
[  166.768544]  [<ffffffff8146efb3>] ? i915_gem_unmap_dma_buf+0x33/0xd0
[  166.768546]  [<ffffffff810c8935>] ? mark_held_locks+0x75/0xa0
[  166.768549]  [<ffffffff8146efb3>] i915_gem_unmap_dma_buf+0x33/0xd0
[  166.768556]  [<ffffffff814fc88c>] dma_buf_unmap_attachment+0x4c/0x70
[  166.768564]  [<ffffffff81451d82>] drm_prime_gem_destroy+0x22/0x40
[  166.768662]  [<ffffffffa02ed663>] radeon_gem_object_free+0x33/0x40 [radeon]
[  166.768665]  [<ffffffff8143b267>] drm_gem_object_free+0x27/0x40
[  166.768667]  [<ffffffff8143b3a0>]
drm_gem_object_handle_unreference_unlocked+0x120/0x130
[  166.768671]  [<ffffffff8143b52a>] drm_gem_handle_delete+0xba/0x110
[  166.768674]  [<ffffffff8143b8e5>] drm_gem_close_ioctl+0x25/0x30
[  166.768676]  [<ffffffff814394d7>] drm_ioctl+0x197/0x680
[  166.768680]  [<ffffffff81757525>] ? _raw_spin_unlock_irqrestore+0x55/0x70
[  166.768682]  [<ffffffff810c8abd>] ? trace_hardirqs_on_caller+0x15d/0x200
[  166.768684]  [<ffffffff810c8b6d>] ? trace_hardirqs_on+0xd/0x10
[  166.768703]  [<ffffffffa02bd04c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
[  166.768708]  [<ffffffff811d5a00>] do_vfs_ioctl+0x2f0/0x4f0
[  166.768710]  [<ffffffff811e0b3c>] ? __fget+0xac/0xf0
[  166.768712]  [<ffffffff811e0a95>] ? __fget+0x5/0xf0
[  166.768714]  [<ffffffff811d5c41>] SyS_ioctl+0x41/0x80
[  166.768717]  [<ffffffff8175832a>] tracesys+0xd4/0xd9

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