Re: Possible fb ref count issue with drm_plane_force_disable()

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

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On 11/04/14 14:50, Ville Syrjälä wrote:

>> So the explicit unref done by drm_plane_force_disable() seems a bit out
>> of place. I can't figure out which drm_framebuffer_reference() would be
>> the matching one for the unref done by drm_plane_force_disable().
>>
>> Any ideas what ref is that? Or is the __drm_framebuffer_unreference()
>> extra in drm_plane_force_disable()?
> 
> That's the reference that was taken by the drm_mode_setplane() when it
> succesfully called the .update_plane() hook.

But drm_mode_setplane() is called via DRM_IOCTL_MODE_SETPLANE, which is
only used for "proper" planes, not for crtc primary planes, right?

At least I don't see drm_mode_setplane() in my stack traces, and git
grep doesn't show it called via any other means than ioctl.

I am not using any planes from my app, just the crtc and (indirectly)
its primary plane.

I've attached a slightly cleaned up log when running my test app. I have
dump_stack()s in the drm_framebuffer_(un)reference functions, and a
printk just before the dump_stack which prints something like "REF FB
ID: 36: 2", where 36 is the fb id, and 2 is the ref count after the
ref/unref.

In the middle of the log there are multiple blank lines, that's where I
ctrl-c the app and it starts shutting down. FB ID 35 is probably the
fbconsole fb, and 36 is the app's fb. And at some point the FB ID 36
changes to 0, as the drm framework clears it.

> __drm_framebuffer_unregister() drops the "idr reference" taken in
> drm_framebuffer_init().

What's "idr"?

 Tomi


[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1.1.2: m.log --]
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# ./nfs/work/omapdrm-tests/perf
using card '/dev/dri/card0'
mode for connector 5 is 1920x1200
1920x1200, stride 7680, size 9216000
[ 3145.642944] REF FB ID: 36: 2
[ 3145.649841] CPU: 0 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3145.661102] Backtrace: 
[ 3145.663726] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3145.672058] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3145.685607] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3145.695251] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf1ce0ac>] (drm_framebuffer_init+0x64/0x94 [drm])
[ 3145.714233] [<bf1ce048>] (drm_framebuffer_init [drm]) from [<bf233614>] (omap_framebuffer_init+0x1ec/0x2b0 [omapdrm])
[ 3145.729888] [<bf233428>] (omap_framebuffer_init [omapdrm]) from [<bf2337c0>] (omap_framebuffer_create+0xe8/0x210 [omapdrm])
[ 3145.754577] [<bf2336d8>] (omap_framebuffer_create [omapdrm]) from [<bf1d0f24>] (drm_mode_addfb2+0x6b8/0x88c [drm])
[ 3145.776672] [<bf1d086c>] (drm_mode_addfb2 [drm]) from [<bf1c313c>] (drm_ioctl+0x198/0x508 [drm])
[ 3145.797180] [<bf1c2fa4>] (drm_ioctl [drm]) from [<c013b544>] (do_vfs_ioctl+0x80/0x628)
[ 3145.810394] [<c013b4c4>] (do_vfs_ioctl) from [<c013bb58>] (SyS_ioctl+0x6c/0x7c)
[ 3145.829864] [<c013baec>] (SyS_ioctl) from [<c000f580>] (ret_fast_syscall+0x0/0x48)
[ 3145.851776] ===========================
[ 3145.851776] 
ignoring unused connector 12
[ 3145.952850] REF FB ID: 36: 3
[ 3145.953002] CPU: 0 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3145.967956] Backtrace: 
[ 3145.970367] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3145.983367] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3145.992370] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3146.002105] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf1ccb98>] (drm_framebuffer_lookup+0x3c/0x4c [drm])
[ 3146.017639] [<bf1ccb5c>] (drm_framebuffer_lookup [drm]) from [<bf1d027c>] (drm_mode_setcrtc+0xf0/0x4f4 [drm])
[ 3146.032196] [<bf1d018c>] (drm_mode_setcrtc [drm]) from [<bf1c313c>] (drm_ioctl+0x198/0x508 [drm])
[ 3146.056213] [<bf1c2fa4>] (drm_ioctl [drm]) from [<c013b544>] (do_vfs_ioctl+0x80/0x628)
[ 3146.075378] [<c013b4c4>] (do_vfs_ioctl) from [<c013bb58>] (SyS_ioctl+0x6c/0x7c)
[ 3146.096649] [<c013baec>] (SyS_ioctl) from [<c000f580>] (ret_fast_syscall+0x0/0x48)
[ 3146.105285] ===========================
[ 3146.105285] 
[ 3146.119659] REF FB ID: 36: 4
[ 3146.122772] CPU: 0 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3146.132232] Backtrace: 
[ 3146.132232] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3146.143157] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3146.156524] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3146.157073] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf1cca68>] (drm_mode_set_config_internal+0xa8/0xf0 [drm])
[ 3146.182342] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf1d0258>] (drm_mode_setcrtc+0xcc/0x4f4 [drm])
[ 3146.200714] [<bf1d018c>] (drm_mode_setcrtc [drm]) from [<bf1c313c>] (drm_ioctl+0x198/0x508 [drm])
[ 3146.223815] [<bf1c2fa4>] (drm_ioctl [drm]) from [<c013b544>] (do_vfs_ioctl+0x80/0x628)
[ 3146.240539] [<c013b4c4>] (do_vfs_ioctl) from [<c013bb58>] (SyS_ioctl+0x6c/0x7c)
[ 3146.259918] [<c013baec>] (SyS_ioctl) from [<c000f580>] (ret_fast_syscall+0x0/0x48)
[ 3146.278350] ===========================
[ 3146.278350] 
[ 3146.283996] UNREF FB ID: 35: 3
[ 3146.284454] CPU: 0 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3146.296722] Backtrace: 
[ 3146.296905] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3146.309875] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3146.319763] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3146.334899] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf1cca78>] (drm_mode_set_config_internal+0xb8/0xf0 [drm])
[ 3146.347167] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf1d0258>] (drm_mode_setcrtc+0xcc/0x4f4 [drm])
[ 3146.362243] [<bf1d018c>] (drm_mode_setcrtc [drm]) from [<bf1c313c>] (drm_ioctl+0x198/0x508 [drm])
[ 3146.381774] [<bf1c2fa4>] (drm_ioctl [drm]) from [<c013b544>] (do_vfs_ioctl+0x80/0x628)
[ 3146.402191] [<c013b4c4>] (do_vfs_ioctl) from [<c013bb58>] (SyS_ioctl+0x6c/0x7c)
[ 3146.420684] [<c013baec>] (SyS_ioctl) from [<c000f580>] (ret_fast_syscall+0x0/0x48)
[ 3146.439788] ===========================
[ 3146.439788] 
[ 3146.448791] UNREF FB ID: 36: 3
[ 3146.452056] CPU: 0 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3146.461547] Backtrace: 
[ 3146.464172] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3146.472930] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3146.485992] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3146.499755] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf1d03d0>] (drm_mode_setcrtc+0x244/0x4f4 [drm])
[ 3146.511077] [<bf1d018c>] (drm_mode_setcrtc [drm]) from [<bf1c313c>] (drm_ioctl+0x198/0x508 [drm])
[ 3146.535278] [<bf1c2fa4>] (drm_ioctl [drm]) from [<c013b544>] (do_vfs_ioctl+0x80/0x628)
[ 3146.550720] [<c013b4c4>] (do_vfs_ioctl) from [<c013bb58>] (SyS_ioctl+0x6c/0x7c)
[ 3146.573486] [<c013baec>] (SyS_ioctl) from [<c000f580>] (ret_fast_syscall+0x0/0x48)
[ 3146.589904] ===========================
[ 3146.589904] 
sequential_line_read: [ 3146.627410] UPDATE PIN REF
[ 3146.630371] REF FB ID: 36: 4
[ 3146.630584] CPU: 1 PID: 1519 Comm: kworker/u4:0 Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3146.643646] Workqueue: omapdrm apply_worker [omapdrm]
[ 3146.643646] Backtrace: 
[ 3146.651733] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3146.663604] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3146.663604] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3146.683563] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf231c44>] (omap_plane_pre_apply+0x188/0x248 [omapdrm])
[ 3146.702331] [<bf231abc>] (omap_plane_pre_apply [omapdrm]) from [<bf2310b8>] (apply_worker+0xb0/0x178 [omapdrm])
[ 3146.721527] [<bf231008>] (apply_worker [omapdrm]) from [<c005e8f0>] (process_one_work+0x1b8/0x510)
[ 3146.740753] [<c005e738>] (process_one_work) from [<c005f050>] (worker_thread+0x120/0x394)
[ 3146.764434] [<c005ef30>] (worker_thread) from [<c0065e9c>] (kthread+0xd0/0xec)
[ 3146.783142] [<c0065dcc>] (kthread) from [<c000f648>] (ret_from_fork+0x14/0x2c)
[ 3146.795562] ===========================
[ 3146.795562] 
[ 3146.810913] sleep
[ 3148.320739] sleep done
[ 3148.320739] UNPIN WORKER UNREF
[ 3148.320739] UNREF FB ID: 35: 2
[ 3148.329681] CPU: 1 PID: 1519 Comm: kworker/u4:0 Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3148.340087] Workqueue: omapdrm flip_worker [drm]
[ 3148.340087] Backtrace: 
[ 3148.340087] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3148.361633] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3148.369354] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3148.381744] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf231d58>] (unpin_worker+0x54/0x70 [omapdrm])
[ 3148.396453] [<bf231d04>] (unpin_worker [omapdrm]) from [<bf1da5bc>] (flip_worker+0x94/0xa0 [drm])
[ 3148.410858] [<bf1da528>] (flip_worker [drm]) from [<c005e8f0>] (process_one_work+0x1b8/0x510)
[ 3148.427215] [<c005e738>] (process_one_work) from [<c005f050>] (worker_thread+0x120/0x394)
[ 3148.445404] [<c005ef30>] (worker_thread) from [<c0065e9c>] (kthread+0xd0/0xec)
[ 3148.466766] [<c0065dcc>] (kthread) from [<c000f648>] (ret_from_fork+0x14/0x2c)
[ 3148.480407] ===========================
[ 3148.480407] 



72 frames, 3164001 us, 22 fps
sequential_line_write: 









\x03[ 3152.279907] __UNREF FB ID: 0: 3
[ 3152.283325] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3152.292846] Backtrace: 
[ 3152.293182] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3152.306427] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3152.317199] [<c05b8028>] (dump_stack) from [<bf1cc7ec>] (__drm_framebuffer_unreference+0x28/0x6c [drm])
[ 3152.329895] [<bf1cc7c4>] (__drm_framebuffer_unreference [drm]) from [<bf1cc878>] (__drm_framebuffer_unregister+0x48/0x4c [drm])
[ 3152.347564] [<bf1cc830>] (__drm_framebuffer_unregister [drm]) from [<bf1d14a4>] (drm_fb_release+0x60/0xa4 [drm])
[ 3152.360870] [<bf1d1444>] (drm_fb_release [drm]) from [<bf1c4298>] (drm_release+0x494/0x544 [drm])
[ 3152.379943] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3152.400238] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3152.421020] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3152.431365] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3152.441772] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3152.457855] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3152.472320] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3152.490112] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3152.501098] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3152.525726] ===========================
[ 3152.525726] 
[ 3152.531799] UNREF FB ID: 0: 2
[ 3152.532073] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3152.544464] Backtrace: 
[ 3152.544647] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3152.560943] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3152.564147] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3152.581207] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf1cca78>] (drm_mode_set_config_internal+0xb8/0xf0 [drm])
[ 3152.595062] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf1cd0f4>] (drm_framebuffer_remove+0x10c/0x14c [drm])
[ 3152.610778] [<bf1ccfe8>] (drm_framebuffer_remove [drm]) from [<bf1d14c8>] (drm_fb_release+0x84/0xa4 [drm])
[ 3152.633911] [<bf1d1444>] (drm_fb_release [drm]) from [<bf1c4298>] (drm_release+0x494/0x544 [drm])
[ 3152.650756] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3152.669921] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3152.690704] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3152.701080] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3152.711456] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3152.725189] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3152.740295] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3152.762481] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3152.776824] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3152.792205] ===========================
[ 3152.792205] 
[ 3152.899841] 
[ 3152.899841] 
[ 3152.899841] ====
[ 3152.899841] ABOUT TO FORCE DISABLE PLANE
[ 3152.909057] __UNREF FB ID: 0: 1
[ 3152.912384] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3152.921905] Backtrace: 
[ 3152.922821] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3152.938568] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3152.938568] [<c05b8028>] (dump_stack) from [<bf1cc7ec>] (__drm_framebuffer_unreference+0x28/0x6c [drm])
[ 3152.959930] [<bf1cc7c4>] (__drm_framebuffer_unreference [drm]) from [<bf1cce1c>] (drm_plane_force_disable+0x38/0x60 [drm])
[ 3152.972442] [<bf1ccde4>] (drm_plane_force_disable [drm]) from [<bf1cd118>] (drm_framebuffer_remove+0x130/0x14c [drm])
[ 3152.991302] [<bf1ccfe8>] (drm_framebuffer_remove [drm]) from [<bf1d14c8>] (drm_fb_release+0x84/0xa4 [drm])
[ 3153.002197] [<bf1d1444>] (drm_fb_release [drm]) from [<bf1c4298>] (drm_release+0x494/0x544 [drm])
[ 3153.030517] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3153.041168] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3153.067687] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3153.075622] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3153.083526] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3153.099365] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3153.111846] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3153.134246] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3153.149810] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3153.161926] ===========================
[ 3153.161926] 
[ 3153.269805] 
[ 3153.269805] 
[ 3153.269805] ====
[ 3153.269805] FORCE DISABLE PLANE done
[ 3153.269805] 
[ 3153.280273] UNREF FB ID: 0: 0
[ 3153.283264] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3153.283477] sleep
[ 3153.294921] Backtrace: 
[ 3153.296264] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3153.311645] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3153.319305] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3153.331756] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf1cd024>] (drm_framebuffer_remove+0x3c/0x14c [drm])
[ 3153.345153] [<bf1ccfe8>] (drm_framebuffer_remove [drm]) from [<bf1d14c8>] (drm_fb_release+0x84/0xa4 [drm])
[ 3153.361572] [<bf1d1444>] (drm_fb_release [drm]) from [<bf1c4298>] (drm_release+0x494/0x544 [drm])
[ 3153.384216] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3153.405364] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3153.424804] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3153.433227] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3153.445343] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3153.457336] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3153.471343] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3153.491394] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3153.509094] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3153.521850] ===========================
[ 3153.521850] 
[ 3153.533233] destroy: FB ID: 0 (eb48f7c0)
[ 3153.569152] REF FB ID: 35: 3
[ 3153.572265] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3153.572631] Backtrace: 
[ 3153.581756] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3153.592742] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3153.606231] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3153.619781] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf1cca68>] (drm_mode_set_config_internal+0xa8/0xf0 [drm])
[ 3153.631988] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf220a70>] (drm_fb_helper_restore_fbdev_mode+0xb8/0xd8 [drm_kms_helper])
[ 3153.651550] [<bf2209b8>] (drm_fb_helper_restore_fbdev_mode [drm_kms_helper]) from [<bf22f588>] (dev_lastclose+0xc4/0x118 [omapdrm])
[ 3153.670196] [<bf22f4c4>] (dev_lastclose [omapdrm]) from [<bf1c3cfc>] (drm_lastclose+0x38/0x140 [drm])
[ 3153.693176] [<bf1c3cc4>] (drm_lastclose [drm]) from [<bf1c4148>] (drm_release+0x344/0x544 [drm])
[ 3153.710845] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3153.730041] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3153.742401] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3153.756072] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3153.770874] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3153.780212] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3153.797729] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3153.817443] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3153.833770] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3153.850372] ===========================
[ 3153.850372] 
[ 3153.850860] REF FB ID: 35: 4
[ 3153.857086] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3153.868530] Backtrace: 
[ 3153.871185] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3153.883178] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3153.888397] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3153.903076] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf1cca68>] (drm_mode_set_config_internal+0xa8/0xf0 [drm])
[ 3153.920898] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf220a70>] (drm_fb_helper_restore_fbdev_mode+0xb8/0xd8 [drm_kms_helper])
[ 3153.941162] [<bf2209b8>] (drm_fb_helper_restore_fbdev_mode [drm_kms_helper]) from [<bf22f588>] (dev_lastclose+0xc4/0x118 [omapdrm])
[ 3153.961547] [<bf22f4c4>] (dev_lastclose [omapdrm]) from [<bf1c3cfc>] (drm_lastclose+0x38/0x140 [drm])
[ 3153.979766] [<bf1c3cc4>] (drm_lastclose [drm]) from [<bf1c4148>] (drm_release+0x344/0x544 [drm])
[ 3153.991699] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3154.013763] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3154.030792] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3154.042633] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3154.058715] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3154.066741] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3154.080718] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3154.101531] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3154.120391] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3154.136962] ===========================
[ 3154.136962] 
[ 3154.142608] UNREF FB ID: 35: 3
[ 3154.143157] CPU: 1 PID: 1525 Comm: perf Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3154.155334] Backtrace: 
[ 3154.156463] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3154.170715] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3154.179748] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3154.193572] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf1cca78>] (drm_mode_set_config_internal+0xb8/0xf0 [drm])
[ 3154.209472] [<bf1cc9c0>] (drm_mode_set_config_internal [drm]) from [<bf220a70>] (drm_fb_helper_restore_fbdev_mode+0xb8/0xd8 [drm_kms_helper])
[ 3154.229003] [<bf2209b8>] (drm_fb_helper_restore_fbdev_mode [drm_kms_helper]) from [<bf22f588>] (dev_lastclose+0xc4/0x118 [omapdrm])
[ 3154.241882] [<bf22f4c4>] (dev_lastclose [omapdrm]) from [<bf1c3cfc>] (drm_lastclose+0x38/0x140 [drm])
[ 3154.266967] [<bf1c3cc4>] (drm_lastclose [drm]) from [<bf1c4148>] (drm_release+0x344/0x544 [drm])
[ 3154.279907] [<bf1c3e04>] (drm_release [drm]) from [<c012b828>] (__fput+0x9c/0x1ec)
[ 3154.301147] [<c012b78c>] (__fput) from [<c012b9d8>] (____fput+0x10/0x14)
[ 3154.321929] [<c012b9c8>] (____fput) from [<c0062c80>] (task_work_run+0xbc/0x100)
[ 3154.329864] [<c0062bc4>] (task_work_run) from [<c00473d0>] (do_exit+0x2f8/0x950)
[ 3154.345947] [<c00470d8>] (do_exit) from [<c0047b3c>] (do_group_exit+0x44/0xb8)
[ 3154.353973] [<c0047af8>] (do_group_exit) from [<c0055d04>] (get_signal_to_deliver+0x23c/0x67c)
[ 3154.370178] [<c0055ac8>] (get_signal_to_deliver) from [<c05b4504>] (do_signal+0xb4/0x3d8)
[ 3154.391204] [<c05b4450>] (do_signal) from [<c0012588>] (do_work_pending+0xa4/0xe4)
[ 3154.401855] [<c00124e4>] (do_work_pending) from [<c000f5d8>] (work_pending+0xc/0x20)
[ 3154.420623] ===========================
[ 3154.420623] 

[ 3154.789916] sleep done
[ 3154.789947] UNPIN WORKER UNREF
[ 3154.795654] UNREF FB ID: 0: -1
[ 3154.798889] CPU: 0 PID: 1519 Comm: kworker/u4:0 Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3154.798889] Workqueue: omapdrm flip_worker [drm]
[ 3154.814208] Backtrace: 
[ 3154.816833] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3154.830718] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3154.830718] [<c05b8028>] (dump_stack) from [<bf1cc978>] (drm_framebuffer_unreference+0x28/0x70 [drm])
[ 3154.852355] [<bf1cc950>] (drm_framebuffer_unreference [drm]) from [<bf231d58>] (unpin_worker+0x54/0x70 [omapdrm])
[ 3154.863800] [<bf231d04>] (unpin_worker [omapdrm]) from [<bf1da5bc>] (flip_worker+0x94/0xa0 [drm])
[ 3154.863800] [<bf1da528>] (flip_worker [drm]) from [<c005e8f0>] (process_one_work+0x1b8/0x510)
[ 3154.897033] [<c005e738>] (process_one_work) from [<c005f050>] (worker_thread+0x120/0x394)
[ 3154.914855] [<c005ef30>] (worker_thread) from [<c0065e9c>] (kthread+0xd0/0xec)
[ 3154.933563] [<c0065dcc>] (kthread) from [<c000f648>] (ret_from_fork+0x14/0x2c)
[ 3154.949951] ===========================
[ 3154.949951] 
[ 3154.955718] UPDATE PIN REF
[ 3154.958618] REF FB ID: 35: 4
[ 3154.961730] CPU: 0 PID: 1519 Comm: kworker/u4:0 Tainted: G        W     3.15.0-rc1-00033-g16787b3dfc0f #45
[ 3154.971984] Workqueue: omapdrm apply_worker [omapdrm]
[ 3154.972015] Backtrace: 
[ 3154.972015] [<c0012bfc>] (dump_backtrace) from [<c0012d98>] (show_stack+0x18/0x1c)
[ 3154.994049] [<c0012d80>] (show_stack) from [<c05b80bc>] (dump_stack+0x94/0xc8)
[ 3155.001770] [<c05b8028>] (dump_stack) from [<bf1cc90c>] (drm_framebuffer_reference+0x54/0x98 [drm])
[ 3155.015472] [<bf1cc8b8>] (drm_framebuffer_reference [drm]) from [<bf231c44>] (omap_plane_pre_apply+0x188/0x248 [omapdrm])
[ 3155.015472] [<bf231abc>] (omap_plane_pre_apply [omapdrm]) from [<bf2310b8>] (apply_worker+0xb0/0x178 [omapdrm])
[ 3155.042053] [<bf231008>] (apply_worker [omapdrm]) from [<c005e8f0>] (process_one_work+0x1b8/0x510)
[ 3155.070922] [<c005e738>] (process_one_work) from [<c005f050>] (worker_thread+0x120/0x394)
[ 3155.092864] [<c005ef30>] (worker_thread) from [<c0065e9c>] (kthread+0xd0/0xec)
[ 3155.111511] [<c0065dcc>] (kthread) from [<c000f648>] (ret_from_fork+0x14/0x2c)
[ 3155.121978] ===========================
[ 3155.121978] 
[ 3155.130920] omapdrm omapdrm.0: rotation '1' ignored for non-tiled fb

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