update information
4.1.0-rc7-bone7, use usb webcam logitech c920 to take pictures.
Babble interrupt issues still exist..
The following is the part of dmesg while having the issue


[  349.815873] musb-hdrc musb-hdrc.1.auto: Babble
[  349.820659] musb-hdrc: setup fifo_mode 4
[  349.820706] musb-hdrc: 28/31 max ep, 16384/16384 memory
[  349.821331] usb 1-1: USB disconnect, device number 2
[  349.848235] ------------[ cut here ]------------
[  349.848320] WARNING: CPU: 0 PID: 1666 at fs/sysfs/group.c:224 
sysfs_remove_group+0x55/0x60()
[  349.848391] sysfs group c0a3cfcc not found for kobject 'event0'
[  349.848408] Modules linked in: usb_f_acm u_serial usb_f_ecm g_multi 
usb_f_mass_storage usb_f_rndis u_ether libcomposite snd_usb_audio snd_hwdep 
snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_seq 
snd_seq_device snd_timer evdev snd uvcvideo videobuf2_vmalloc 
videobuf2_memops soundcore videobuf2_core ti_am335x_adc kfifo_buf 
industrialio tda998x tilcdc omap_aes omap_sham ti_am335x_tsc omap_rng 
drm_kms_helper rng_core ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio
[  349.848747] CPU: 0 PID: 1666 Comm: v4l2grab Not tainted 4.1.0-rc6-bone6 
#1
[  349.848769] Hardware name: Generic AM33XX (Flattened Device Tree)
[  349.848850] [<c0012741>] (unwind_backtrace) from [<c0010941>] 
(show_stack+0x11/0x14)
[  349.848917] [<c0010941>] (show_stack) from [<c002cfab>] 
(warn_slowpath_common+0x57/0x84)
[  349.849026] [<c002cfab>] (warn_slowpath_common) from [<c002d043>] 
(warn_slowpath_fmt+0x23/0x2c)
[  349.849079] [<c002d043>] (warn_slowpath_fmt) from [<c01336a5>] 
(sysfs_remove_group+0x55/0x60)
[  349.849133] [<c01336a5>] (sysfs_remove_group) from [<c03cd4e9>] 
(device_del+0x2d/0x16c)
[  349.849204] [<c03cd4e9>] (device_del) from [<bf8e20df>] 
(evdev_disconnect+0x16/0x3c [evdev])
[  349.849286] [<bf8e20df>] (evdev_disconnect [evdev]) from [<c0475ec1>] 
(__input_unregister_device+0x65/0xe4)
[  349.849329] [<c0475ec1>] (__input_unregister_device) from [<c0476033>] 
(input_unregister_device+0x2f/0x58)
[  349.849469] [<c0476033>] (input_unregister_device) from [<bf8bb2c5>] 
(uvc_status_cleanup+0x2c/0x30 [uvcvideo])
[  349.849602] [<bf8bb2c5>] (uvc_status_cleanup [uvcvideo]) from 
[<bf8b41e3>] (uvc_delete+0xe/0xd0 [uvcvideo])
[  349.849695] [<bf8b41e3>] (uvc_delete [uvcvideo]) from [<bf8b436f>] 
(uvc_release+0x2e/0x30 [uvcvideo])
[  349.849771] [<bf8b436f>] (uvc_release [uvcvideo]) from [<c049cbfd>] 
(v4l2_device_release+0x89/0xac)
[  349.849814] [<c049cbfd>] (v4l2_device_release) from [<c03ccf9f>] 
(device_release+0x23/0x60)
[  349.849860] [<c03ccf9f>] (device_release) from [<c033caed>] 
(kobject_cleanup+0x51/0x11c)
[  349.849899] [<c033caed>] (kobject_cleanup) from [<c049bab3>] 
(v4l2_release+0x37/0x54)
[  349.849938] [<c049bab3>] (v4l2_release) from [<c00ee631>] 
(__fput+0x65/0x144)
[  349.849994] [<c00ee631>] (__fput) from [<c003d561>] 
(task_work_run+0x69/0x90)
[  349.850036] [<c003d561>] (task_work_run) from [<c002e58d>] 
(do_exit+0x22d/0x6dc)
[  349.850071] [<c002e58d>] (do_exit) from [<c002ea91>] 
(do_group_exit+0x2d/0x6c)
[  349.850108] [<c002ea91>] (do_group_exit) from [<c002eae1>] 
(__wake_up_parent+0x1/0x18)
[  349.850131] ---[ end trace e9fbe6cf6b19f635 ]---
[  349.859582] ------------[ cut here ]------------
[  349.859658] WARNING: CPU: 0 PID: 1666 at fs/sysfs/group.c:224 
sysfs_remove_group+0x55/0x60()
[  349.859681] sysfs group c0a3cfcc not found for kobject 'input0'
[  349.859699] Modules linked in: usb_f_acm u_serial usb_f_ecm g_multi 
usb_f_mass_storage usb_f_rndis u_ether libcomposite snd_usb_audio snd_hwdep 
snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_seq 
snd_seq_device snd_timer evdev snd uvcvideo videobuf2_vmalloc 
videobuf2_memops soundcore videobuf2_core ti_am335x_adc kfifo_buf 
industrialio tda998x tilcdc omap_aes omap_sham ti_am335x_tsc omap_rng 
drm_kms_helper rng_core ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio
[  349.859968] CPU: 0 PID: 1666 Comm: v4l2grab Tainted: G        W       
4.1.0-rc6-bone6 #1
[  349.859989] Hardware name: Generic AM33XX (Flattened Device Tree)
[  349.860066] [<c0012741>] (unwind_backtrace) from [<c0010941>] 
(show_stack+0x11/0x14)
[  349.860131] [<c0010941>] (show_stack) from [<c002cfab>] 
(warn_slowpath_common+0x57/0x84)
[  349.860173] [<c002cfab>] (warn_slowpath_common) from [<c002d043>] 
(warn_slowpath_fmt+0x23/0x2c)
[  349.860212] [<c002d043>] (warn_slowpath_fmt) from [<c01336a5>] 
(sysfs_remove_group+0x55/0x60)
[  349.860264] [<c01336a5>] (sysfs_remove_group) from [<c03cd4e9>] 
(device_del+0x2d/0x16c)
[  349.860309] [<c03cd4e9>] (device_del) from [<c0476033>] 
(input_unregister_device+0x2f/0x58)
[  349.860503] [<c0476033>] (input_unregister_device) from [<bf8bb2c5>] 
(uvc_status_cleanup+0x2c/0x30 [uvcvideo])
[  349.860704] [<bf8bb2c5>] (uvc_status_cleanup [uvcvideo]) from 
[<bf8b41e3>] (uvc_delete+0xe/0xd0 [uvcvideo])
[  349.860797] [<bf8b41e3>] (uvc_delete [uvcvideo]) from [<bf8b436f>] 
(uvc_release+0x2e/0x30 [uvcvideo])
[  349.860925] [<bf8b436f>] (uvc_release [uvcvideo]) from [<c049cbfd>] 
(v4l2_device_release+0x89/0xac)
[  349.860983] [<c049cbfd>] (v4l2_device_release) from [<c03ccf9f>] 
(device_release+0x23/0x60)
[  349.861032] [<c03ccf9f>] (device_release) from [<c033caed>] 
(kobject_cleanup+0x51/0x11c)
[  349.861071] [<c033caed>] (kobject_cleanup) from [<c049bab3>] 
(v4l2_release+0x37/0x54)
[  349.861110] [<c049bab3>] (v4l2_release) from [<c00ee631>] 
(__fput+0x65/0x144)
[  349.861165] [<c00ee631>] (__fput) from [<c003d561>] 
(task_work_run+0x69/0x90)
[  349.861206] [<c003d561>] (task_work_run) from [<c002e58d>] 
(do_exit+0x22d/0x6dc)
[  349.861242] [<c002e58d>] (do_exit) from [<c002ea91>] 
(do_group_exit+0x2d/0x6c)
[  349.861278] [<c002ea91>] (do_group_exit) from [<c002eae1>] 
(__wake_up_parent+0x1/0x18)
[  349.861301] ---[ end trace e9fbe6cf6b19f636 ]---
[  349.861357] ------------[ cut here ]------------
[  349.861391] WARNING: CPU: 0 PID: 1666 at fs/sysfs/group.c:224 
sysfs_remove_group+0x55/0x60()
[  349.861412] sysfs group c0a4ff00 not found for kobject 'input0'
[  349.861427] Modules linked in: usb_f_acm u_serial usb_f_ecm g_multi 
usb_f_mass_storage usb_f_rndis u_ether libcomposite snd_usb_audio snd_hwdep 
snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_seq 
snd_seq_device snd_timer evdev snd uvcvideo videobuf2_vmalloc 
videobuf2_memops soundcore videobuf2_core ti_am335x_adc kfifo_buf 
industrialio tda998x tilcdc omap_aes omap_sham ti_am335x_tsc omap_rng 
drm_kms_helper rng_core ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio
[  349.861664] CPU: 0 PID: 1666 Comm: v4l2grab Tainted: G        W       
4.1.0-rc6-bone6 #1
[  349.861684] Hardware name: Generic AM33XX (Flattened Device Tree)
[  349.861733] [<c0012741>] (unwind_backtrace) from [<c0010941>] 
(show_stack+0x11/0x14)
[  349.861783] [<c0010941>] (show_stack) from [<c002cfab>] 
(warn_slowpath_common+0x57/0x84)
[  349.861824] [<c002cfab>] (warn_slowpath_common) from [<c002d043>] 
(warn_slowpath_fmt+0x23/0x2c)
[  349.861862] [<c002d043>] (warn_slowpath_fmt) from [<c01336a5>] 
(sysfs_remove_group+0x55/0x60)
[  349.861899] [<c01336a5>] (sysfs_remove_group) from [<c01336c9>] 
(sysfs_remove_groups+0x19/0x24)
[  349.861939] [<c01336c9>] (sysfs_remove_groups) from [<c03cd363>] 
(device_remove_attrs+0x2f/0x44)
[  349.861980] [<c03cd363>] (device_remove_attrs) from [<c03cd56b>] 
(device_del+0xaf/0x16c)
[  349.862019] [<c03cd56b>] (device_del) from [<c0476033>] 
(input_unregister_device+0x2f/0x58)
[  349.862125] [<c0476033>] (input_unregister_device) from [<bf8bb2c5>] 
(uvc_status_cleanup+0x2c/0x30 [uvcvideo])
[  349.862254] [<bf8bb2c5>] (uvc_status_cleanup [uvcvideo]) from 
[<bf8b41e3>] (uvc_delete+0xe/0xd0 [uvcvideo])
[  349.862344] [<bf8b41e3>] (uvc_delete [uvcvideo]) from [<bf8b436f>] 
(uvc_release+0x2e/0x30 [uvcvideo])
[  349.862413] [<bf8b436f>] (uvc_release [uvcvideo]) from [<c049cbfd>] 
(v4l2_device_release+0x89/0xac)
[  349.862454] [<c049cbfd>] (v4l2_device_release) from [<c03ccf9f>] 
(device_release+0x23/0x60)
[  349.862493] [<c03ccf9f>] (device_release) from [<c033caed>] 
(kobject_cleanup+0x51/0x11c)
[  349.862530] [<c033caed>] (kobject_cleanup) from [<c049bab3>] 
(v4l2_release+0x37/0x54)
[  349.862565] [<c049bab3>] (v4l2_release) from [<c00ee631>] 
(__fput+0x65/0x144)
[  349.862606] [<c00ee631>] (__fput) from [<c003d561>] 
(task_work_run+0x69/0x90)
[  349.862645] [<c003d561>] (task_work_run) from [<c002e58d>] 
(do_exit+0x22d/0x6dc)
[  349.862679] [<c002e58d>] (do_exit) from [<c002ea91>] 
(do_group_exit+0x2d/0x6c)
[  349.862714] [<c002ea91>] (do_group_exit) from [<c002eae1>] 
(__wake_up_parent+0x1/0x18)
[  349.862736] ---[ end trace e9fbe6cf6b19f637 ]---
[  349.862756] ------------[ cut here ]------------
[  349.862788] WARNING: CPU: 0 PID: 1666 at fs/sysfs/group.c:224 
sysfs_remove_group+0x55/0x60()
[  349.862809] sysfs group c0a4ff10 not found for kobject 'input0'
[  349.862823] Modules linked in: usb_f_acm u_serial usb_f_ecm g_multi 
usb_f_mass_storage usb_f_rndis u_ether libcomposite snd_usb_audio snd_hwdep 
snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_seq 
snd_seq_device snd_timer evdev snd uvcvideo videobuf2_vmalloc 
videobuf2_memops soundcore videobuf2_core ti_am335x_adc kfifo_buf 
industrialio tda998x tilcdc omap_aes omap_sham ti_am335x_tsc omap_rng 
drm_kms_helper rng_core ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio
[  349.863053] CPU: 0 PID: 1666 Comm: v4l2grab Tainted: G        W       
4.1.0-rc6-bone6 #1
[  349.863073] Hardware name: Generic AM33XX (Flattened Device Tree)
[  349.863268] [<c0012741>] (unwind_backtrace) from [<c0010941>] 
(show_stack+0x11/0x14)
[  349.863320] [<c0010941>] (show_stack) from [<c002cfab>] 
(warn_slowpath_common+0x57/0x84)
[  349.863360] [<c002cfab>] (warn_slowpath_common) from [<c002d043>] 
(warn_slowpath_fmt+0x23/0x2c)
[  349.863398] [<c002d043>] (warn_slowpath_fmt) from [<c01336a5>] 
(sysfs_remove_group+0x55/0x60)
[  349.863434] [<c01336a5>] (sysfs_remove_group) from [<c01336c9>] 
(sysfs_remove_groups+0x19/0x24)
[  349.863475] [<c01336c9>] (sysfs_remove_groups) from [<c03cd363>] 
(device_remove_attrs+0x2f/0x44)
[  349.863515] [<c03cd363>] (device_remove_attrs) from [<c03cd56b>] 
(device_del+0xaf/0x16c)
[  349.863554] [<c03cd56b>] (device_del) from [<c0476033>] 
(input_unregister_device+0x2f/0x58)
[  349.863660] [<c0476033>] (input_unregister_device) from [<bf8bb2c5>] 
(uvc_status_cleanup+0x2c/0x30 [uvcvideo])
[  349.863789] [<bf8bb2c5>] (uvc_status_cleanup [uvcvideo]) from 
[<bf8b41e3>] (uvc_delete+0xe/0xd0 [uvcvideo])
[  349.863880] [<bf8b41e3>] (uvc_delete [uvcvideo]) from [<bf8b436f>] 
(uvc_release+0x2e/0x30 [uvcvideo])
[  349.863950] [<bf8b436f>] (uvc_release [uvcvideo]) from [<c049cbfd>] 
(v4l2_device_release+0x89/0xac)
[  349.863990] [<c049cbfd>] (v4l2_device_release) from [<c03ccf9f>] 
(device_release+0x23/0x60)
[  349.864030] [<c03ccf9f>] (device_release) from [<c033caed>] 
(kobject_cleanup+0x51/0x11c)
[  349.864066] [<c033caed>] (kobject_cleanup) from [<c049bab3>] 
(v4l2_release+0x37/0x54)
[  349.864101] [<c049bab3>] (v4l2_release) from [<c00ee631>] 
(__fput+0x65/0x144)
[  349.864141] [<c00ee631>] (__fput) from [<c003d561>] 
(task_work_run+0x69/0x90)
[  349.864181] [<c003d561>] (task_work_run) from [<c002e58d>] 
(do_exit+0x22d/0x6dc)
[  349.864215] [<c002e58d>] (do_exit) from [<c002ea91>] 
(do_group_exit+0x2d/0x6c)
[  349.864250] [<c002ea91>] (do_group_exit) from [<c002eae1>] 
(__wake_up_parent+0x1/0x18)
[  349.864272] ---[ end trace e9fbe6cf6b19f638 ]---
[  349.875203] ------------[ cut here ]------------
[  349.875271] WARNING: CPU: 0 PID: 1666 at fs/sysfs/group.c:224 
sysfs_remove_group+0x55/0x60()
[  349.875294] sysfs group c0a3cfcc not found for kobject 'media0'
[  349.875312] Modules linked in: usb_f_acm u_serial usb_f_ecm g_multi 
usb_f_mass_storage usb_f_rndis u_ether libcomposite snd_usb_audio snd_hwdep 
snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_rawmidi snd_pcm snd_seq 
snd_seq_device snd_timer evdev snd uvcvideo videobuf2_vmalloc 
videobuf2_memops soundcore videobuf2_core ti_am335x_adc kfifo_buf 
industrialio tda998x tilcdc omap_aes omap_sham ti_am335x_tsc omap_rng 
drm_kms_helper rng_core ti_am335x_tscadc uio_pdrv_genirq leds_gpio uio
[  349.875577] CPU: 0 PID: 1666 Comm: v4l2grab Tainted: G        W       
4.1.0-rc6-bone6 #1
[  349.875597] Hardware name: Generic AM33XX (Flattened Device Tree)
[  349.875675] [<c0012741>] (unwind_backtrace) from [<c0010941>] 
(show_stack+0x11/0x14)
[  349.875738] [<c0010941>] (show_stack) from [<c002cfab>] 
(warn_slowpath_common+0x57/0x84)
[  349.875780] [<c002cfab>] (warn_slowpath_common) from [<c002d043>] 
(warn_slowpath_fmt+0x23/0x2c)
[  349.875818] [<c002d043>] (warn_slowpath_fmt) from [<c01336a5>] 
(sysfs_remove_group+0x55/0x60)
[  349.875869] [<c01336a5>] (sysfs_remove_group) from [<c03cd4e9>] 
(device_del+0x2d/0x16c)
[  349.875912] [<c03cd4e9>] (device_del) from [<c03cd643>] 
(device_unregister+0x1b/0x48)
[  349.876009] [<c03cd643>] (device_unregister) from [<bf8b429d>] 
(uvc_delete+0xc8/0xd0 [uvcvideo])
[  349.876105] [<bf8b429d>] (uvc_delete [uvcvideo]) from [<bf8b436f>] 
(uvc_release+0x2e/0x30 [uvcvideo])
[  349.876180] [<bf8b436f>] (uvc_release [uvcvideo]) from [<c049cbfd>] 
(v4l2_device_release+0x89/0xac)
[  349.876223] [<c049cbfd>] (v4l2_device_release) from [<c03ccf9f>] 
(device_release+0x23/0x60)
[  349.876269] [<c03ccf9f>] (device_release) from [<c033caed>] 
(kobject_cleanup+0x51/0x11c)
[  349.876309] [<c033caed>] (kobject_cleanup) from [<c049bab3>] 
(v4l2_release+0x37/0x54)
[  349.876385] [<c049bab3>] (v4l2_release) from [<c00ee631>] 
(__fput+0x65/0x144)
[  349.876440] [<c00ee631>] (__fput) from [<c003d561>] 
(task_work_run+0x69/0x90)
[  349.876542] [<c003d561>] (task_work_run) from [<c002e58d>] 
(do_exit+0x22d/0x6dc)
[  349.876579] [<c002e58d>] (do_exit) from [<c002ea91>] 
(do_group_exit+0x2d/0x6c)
[  349.876616] [<c002ea91>] (do_group_exit) from [<c002eae1>] 
(__wake_up_parent+0x1/0x18)
[  349.876639] ---[ end trace e9fbe6cf6b19f639 ]---
[  350.323151] usb 1-1: new high-speed USB device number 3 using musb-hdrc
[  351.585302] usb 1-1: New USB device found, idVendor=046d, idProduct=082d
[  351.585353] usb 1-1: New USB device strings: Mfr=0, Product=2, 
SerialNumber=1
[  351.585382] usb 1-1: Product: HD Pro Webcam C920
[  351.585408] usb 1-1: SerialNumber: 6FAF985F
[  351.587413] uvcvideo: Found UVC 1.00 device HD Pro Webcam C920 
(046d:082d)
[  351.594999] input: HD Pro Webcam C920 as 
/devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb1/1-1/1-1:1.0/input/input1

jez...@gmail.com於 2013年8月31日星期六 UTC+8下午11時42分09秒寫道:
>
> I'm using my Beaglebone Black with a USB temperature sensor. It works very 
> well, however I noticed monitoring stopped last night after roughly 35 days 
> uptime. This morning I looked more closely into the log file and noticed:
>
> kernel: [2892926.929555] CAUTION: musb: Babble Interrupt Occurred
>
> I wasn't able to successfully reset the USB device and before I was able 
> to restart the BBB stopped responding. I power-cycled it and it was back to 
> normal again. Any ideas what caused this kernel message?
>

-- 
For more options, visit http://beagleboard.org/discuss
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