Jun 26 08:32:17 testc kernel: [ 3371.547292] INFO: task python:13475 blocked for more than 120 seconds.
Jun 26 08:32:17 testc kernel: [ 3371.547320] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jun 26 08:32:17 testc kernel: [ 3371.547352] python          D c03fc034     0 13475   1639 0x00000001
Jun 26 08:32:17 testc kernel: [ 3371.547434] [<c03fc034>] (__schedule+0x314/0x670) from [<c03fc954>] (schedule+0x58/0x70)
Jun 26 08:32:17 testc kernel: [ 3371.547490] [<c03fc954>] (schedule+0x58/0x70) from [<c02da7b4>] (usb_kill_urb+0xb4/0x100)
Jun 26 08:32:17 testc kernel: [ 3371.547591] [<c02da7b4>] (usb_kill_urb+0xb4/0x100) from [<bf009a20>] (generic_cleanup+0x58/0xfc [usbserial])
Jun 26 08:32:17 testc kernel: [ 3371.547690] [<bf009a20>] (generic_cleanup+0x58/0xfc [usbserial]) from [<bf009b70>] (usb_serial_generic_close+0x30/0x5c [usbserial])
Jun 26 08:32:17 testc kernel: [ 3371.547789] [<bf009b70>] (usb_serial_generic_close+0x30/0x5c [usbserial]) from [<bf019e6c>] (ftdi_close+0x3c/0x74 [ftdi_sio])
Jun 26 08:32:17 testc kernel: [ 3371.547860] [<bf019e6c>] (ftdi_close+0x3c/0x74 [ftdi_sio]) from [<bf007040>] (serial_down+0x40/0x44 [usbserial])
Jun 26 08:32:17 testc kernel: [ 3371.547937] [<bf007040>] (serial_down+0x40/0x44 [usbserial]) from [<c027f870>] (tty_port_shutdown+0x7c/0x88)
Jun 26 08:32:17 testc kernel: [ 3371.547990] [<c027f870>] (tty_port_shutdown+0x7c/0x88) from [<c02802c4>] (tty_port_close+0x30/0x64)
Jun 26 08:32:17 testc kernel: [ 3371.548049] [<c02802c4>] (tty_port_close+0x30/0x64) from [<bf00779c>] (serial_close+0x40/0x6c [usbserial])
Jun 26 08:32:17 testc kernel: [ 3371.548124] [<bf00779c>] (serial_close+0x40/0x6c [usbserial]) from [<c0277688>] (tty_release+0x12c/0x534)
Jun 26 08:32:17 testc kernel: [ 3371.548189] [<c0277688>] (tty_release+0x12c/0x534) from [<c00f7f74>] (fput+0xc0/0x218)
Jun 26 08:32:17 testc kernel: [ 3371.548239] [<c00f7f74>] (fput+0xc0/0x218) from [<c00f43b4>] (filp_close+0x78/0x90)
Jun 26 08:32:17 testc kernel: [ 3371.548283] [<c00f43b4>] (filp_close+0x78/0x90) from [<c0031024>] (put_files_struct+0x130/0x15c)
Jun 26 08:32:17 testc kernel: [ 3371.548323] [<c0031024>] (put_files_struct+0x130/0x15c) from [<c003110c>] (exit_files+0x5c/0x68)
Jun 26 08:32:17 testc kernel: [ 3371.548368] [<c003110c>] (exit_files+0x5c/0x68) from [<c003126c>] (do_exit+0x154/0x7c4)
Jun 26 08:32:17 testc kernel: [ 3371.548404] [<c003126c>] (do_exit+0x154/0x7c4) from [<c0031bb8>] (do_group_exit+0x50/0xe4)
Jun 26 08:32:17 testc kernel: [ 3371.548456] [<c0031bb8>] (do_group_exit+0x50/0xe4) from [<c0042dfc>] (get_signal_to_deliver+0x22c/0x604)
Jun 26 08:32:17 testc kernel: [ 3371.548522] [<c0042dfc>] (get_signal_to_deliver+0x22c/0x604) from [<c0011228>] (do_signal+0xa4/0x5a0)
Jun 26 08:32:17 testc kernel: [ 3371.548566] [<c0011228>] (do_signal+0xa4/0x5a0) from [<c0011d6c>] (do_notify_resume+0x6c/0x78)
Jun 26 08:32:17 testc kernel: [ 3371.548616] [<c0011d6c>] (do_notify_resume+0x6c/0x78) from [<c000e1b0>] (work_pending+0x24/0x28)