[  237.235515] bcm2835-v4l2: Broadcom 2835 MMAL video capture ver 0.0.2 loaded.
[  253.265723] ------------[ cut here ]------------
[  253.265780] WARNING: CPU: 0 PID: 953 at drivers/media/v4l2-core/videobuf2-core.c:2179 __vb2_queue_cancel+0xf8/0x15c [videobuf2_core]()
[  253.265794] Modules linked in: bcm2835_v4l2 videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media ctr ccm arc4 rt2800usb rt2800lib rt2x00usb rt2x00lib mac80211 cfg80211 crc_ccitt rfkill evdev joydev bcm2835_gpiomem uio_pdrv_genirq uio i2c_dev snd_bcm2835 snd_pcm snd_timer snd fuse ipv6
[  253.265967] CPU: 0 PID: 953 Comm: v4l2-ctl Not tainted 4.1.12-v7+ #1
[  253.265980] Hardware name: BCM2709
[  253.266025] [<80018444>] (unwind_backtrace) from [<80013e08>] (show_stack+0x20/0x24)
[  253.266054] [<80013e08>] (show_stack) from [<80557fb4>] (dump_stack+0x98/0xe0)
[  253.266084] [<80557fb4>] (dump_stack) from [<80026aa8>] (warn_slowpath_common+0x8c/0xc8)
[  253.266113] [<80026aa8>] (warn_slowpath_common) from [<80026ba0>] (warn_slowpath_null+0x2c/0x34)
[  253.266147] [<80026ba0>] (warn_slowpath_null) from [<7f2f2784>] (__vb2_queue_cancel+0xf8/0x15c [videobuf2_core])
[  253.266208] [<7f2f2784>] (__vb2_queue_cancel [videobuf2_core]) from [<7f2f44b4>] (vb2_internal_streamoff+0x40/0xd8 [videobuf2_core])
[  253.266252] [<7f2f44b4>] (vb2_internal_streamoff [videobuf2_core]) from [<7f2f4588>] (vb2_streamoff+0x3c/0x60 [videobuf2_core])
[  253.266295] [<7f2f4588>] (vb2_streamoff [videobuf2_core]) from [<7f2f45fc>] (vb2_ioctl_streamoff+0x50/0x54 [videobuf2_core])
[  253.266353] [<7f2f45fc>] (vb2_ioctl_streamoff [videobuf2_core]) from [<7f2beb7c>] (v4l_streamoff+0x28/0x2c [videodev])
[  253.266427] [<7f2beb7c>] (v4l_streamoff [videodev]) from [<7f2c1ecc>] (__video_do_ioctl+0x270/0x30c [videodev])
[  253.266505] [<7f2c1ecc>] (__video_do_ioctl [videodev]) from [<7f2c1868>] (video_usercopy+0x180/0x550 [videodev])
[  253.266583] [<7f2c1868>] (video_usercopy [videodev]) from [<7f2c1c54>] (video_ioctl2+0x1c/0x24 [videodev])
[  253.266648] [<7f2c1c54>] (video_ioctl2 [videodev]) from [<7f2bd6d8>] (v4l2_ioctl+0xb0/0xd0 [videodev])
[  253.266692] [<7f2bd6d8>] (v4l2_ioctl [videodev]) from [<801564c0>] (do_vfs_ioctl+0x420/0x618)
[  253.266719] [<801564c0>] (do_vfs_ioctl) from [<801566fc>] (SyS_ioctl+0x44/0x6c)
[  253.266745] [<801566fc>] (SyS_ioctl) from [<8000f980>] (ret_fast_syscall+0x0/0x54)
[  253.266760] ---[ end trace 310ccd47c847355e ]---