[30551.206239] usb 2-5: dvb_usb_v2: usb_bulk_msg() failed=-19
[30551.206246] i2c i2c-6: af9013: i2c rd failed=-19 reg=d417 len=1
[30720.972038] INFO: task khubd:20 blocked for more than 120 seconds.
[30720.972046]       Tainted: PF          O 3.13.0-27-generic #50-Ubuntu
[30720.972048] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[30720.972050] khubd           D d2e1c0b0     0    20      2 0x00000000
[30720.972057]  f71c5b5c 00000046 f71c5af4 d2e1c0b0 00000246 c1a8b540 43195a3f 
00001bc9
[30720.972063]  c1a8b540 d2e98cf0 f71519e0 f7bd8540 00000001 f71519e0 c1082b00 
00100100
[30720.972068]  00200200 e7d07f90 e4778228 d2e1c0b0 f71c5b40 c107513d e7c8ac00 
00000246
[30720.972074] Call Trace:
[30720.972088]  [<c1082b00>] ? wake_up_state+0x20/0x20
[30720.972093]  [<c107513d>] ? kthread_stop+0x3d/0xc0
[30720.972098]  [<c10911bb>] ? prepare_to_wait_event+0x6b/0xd0
[30720.972103]  [<c16529b3>] schedule+0x23/0x60
[30720.972132]  [<f903b04d>] dvb_unregister_frontend+0x9d/0x100 [dvb_core]
[30720.972141]  [<f8f24b06>] ? rc_free_device+0x36/0x40 [rc_core]
[30720.972145]  [<c1091220>] ? prepare_to_wait_event+0xd0/0xd0
[30720.972152]  [<f901a3ad>] dvb_usbv2_exit+0xad/0x310 [dvb_usb_v2]
[30720.972156]  [<c10862ed>] ? __enqueue_entity+0x6d/0x80
[30720.972162]  [<f901a67f>] dvb_usbv2_disconnect+0x6f/0xf0 [dvb_usb_v2]
[30720.972168]  [<c12f77a3>] ? format_decode+0x323/0x390
[30720.972175]  [<c1415460>] ? __pm_runtime_suspend+0x70/0x70
[30720.972179]  [<c14154c0>] ? pm_suspend_timer_fn+0x60/0x60
[30720.972187]  [<c14abb4a>] usb_unbind_interface+0x4a/0x190
[30720.972191]  [<c1409d81>] __device_release_driver+0x61/0xc0
[30720.972195]  [<c1409dfd>] device_release_driver+0x1d/0x30
[30720.972198]  [<c1409773>] bus_remove_device+0xc3/0x130
[30720.972202]  [<c14060b4>] ? device_remove_attrs+0x54/0x70
[30720.972206]  [<c1406aec>] device_del+0xec/0x170
[30720.972210]  [<c14a9746>] usb_disable_device+0x86/0x240
[30720.972213]  [<c1406efd>] ? _dev_info+0x2d/0x30
[30720.972217]  [<c149ec3d>] usb_disconnect+0x9d/0x1d0
[30720.972220]  [<c14a186a>] hub_port_connect_change+0xca/0xaa0
[30720.972224]  [<c14a8376>] ? usb_control_msg+0xb6/0xd0
[30720.972227]  [<c14a2678>] hub_events+0x438/0xa60
[30720.972231]  [<c1652578>] ? __schedule+0x358/0x770
[30720.972234]  [<c1091044>] ? finish_wait+0x44/0x60
[30720.972238]  [<c14a2cc5>] hub_thread+0x25/0x140
[30720.972241]  [<c1091220>] ? prepare_to_wait_event+0xd0/0xd0
[30720.972244]  [<c14a2ca0>] ? hub_events+0xa60/0xa60
[30720.972247]  [<c1074f21>] kthread+0xa1/0xc0
[30720.972252]  [<c165d037>] ret_from_kernel_thread+0x1b/0x28
[30720.972256]  [<c1074e80>] ? kthread_create_on_node+0x150/0x150
[30720.972329] INFO: task vlc:19266 blocked for more than 120 seconds.
[30720.972332]       Tainted: PF          O 3.13.0-27-generic #50-Ubuntu
[30720.972334] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.
[30720.972335] vlc             D c108ac82     0 19266  15309 0x00000000
[30720.972339]  e478dcb0 00000082 e478dc90 c108ac82 f7bd85b0 c1a8b540 e9fa1d45 
00001bc8
[30720.972345]  c1a8b540 f62540b0 f62526d0 f7bd8540 d2e1c0b0 f62526d0 e478dc88 
c100ecb0
[30720.972349]  00000000 f62529f4 f7bd5e00 f9ec6d95 00000002 f9ec6d95 f14aca80 
f14aca80
[30720.972355] Call Trace:
[30720.972359]  [<c108ac82>] ? put_prev_task_fair+0xd2/0x540
[30720.972364]  [<c100ecb0>] ? __switch_to+0xb0/0x340
[30720.972368]  [<c1652578>] ? __schedule+0x358/0x770
[30720.972371]  [<c16529b3>] schedule+0x23/0x60
[30720.972375]  [<c1651ccd>] schedule_timeout+0x1cd/0x250
[30720.972379]  [<c1080c22>] ? check_preempt_curr+0x72/0x90
[30720.972382]  [<c1080c58>] ? ttwu_do_wakeup+0x18/0x120
[30720.972385]  [<c1653223>] wait_for_completion+0x83/0x100
[30720.972389]  [<c1082b00>] ? wake_up_state+0x20/0x20
[30720.972392]  [<c107513d>] kthread_stop+0x3d/0xc0
[30720.972403]  [<f903ab6b>] dvb_frontend_stop.isra.10+0x3b/0xc0 [dvb_core]
[30720.972409]  [<c11528ee>] ? __vmalloc_node+0x5e/0x70
[30720.972418]  [<f903ae51>] dvb_frontend_open+0x261/0x3c0 [dvb_core]
[30720.972421]  [<c1152ad8>] ? vmalloc+0x38/0x40
[30720.972432]  [<f903e537>] ? dvb_ringbuffer_init+0x37/0x40 [dvb_core]
[30720.972439]  [<f9031406>] ? dvb_device_open+0x66/0xd0 [dvb_core]
[30720.972447]  [<f903141b>] dvb_device_open+0x7b/0xd0 [dvb_core]
[30720.972453]  [<c117c987>] chrdev_open+0x87/0x190
[30720.972457]  [<c117c900>] ? cdev_put+0x20/0x20
[30720.972462]  [<c1176574>] do_dentry_open+0x174/0x260
[30720.972466]  [<c1181ed0>] ? __inode_permission+0x40/0xa0
[30720.972469]  [<c117c900>] ? cdev_put+0x20/0x20
[30720.972473]  [<c1176aac>] vfs_open+0x3c/0x50
[30720.972476]  [<c1185849>] do_last+0x4a9/0xf60
[30720.972479]  [<c1183fdf>] ? link_path_walk+0x5f/0x6f0
[30720.972485]  [<c12a6d5a>] ? apparmor_file_alloc_security+0x4a/0x130
[30720.972489]  [<c11863b0>] path_openat+0xb0/0x520
[30720.972492]  [<c11873d1>] do_filp_open+0x31/0x80
[30720.972496]  [<c1178245>] do_sys_open+0x115/0x260
[30720.972500]  [<c11887ff>] ? do_fcntl+0x3bf/0x4d0
[30720.972503]  [<c11783e0>] SyS_openat+0x20/0x30
[30720.972507]  [<c165d0cd>] sysenter_do_call+0x12/0x28
[30720.972512]  [<c1650000>] ? kzalloc.constprop.8+0x5/0x19
[30840.972041] INFO: task khubd:20 blocked for more than 120 seconds.
[30840.972049]       Tainted: PF          O 3.13.0-27-generic #50-Ubuntu
[30840.972050] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this 
message.

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https://bugs.launchpad.net/bugs/558532

Title:
  After removing dvb-t usb stick (MSI Digivox duo, af9015 based)usb
  subsystem hangs

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