On Wed, Dec 09, 2015 at 12:36:12PM -0600, SaRaVanAn wrote: > We are using sierra modem for 4G LTE networks. we used to communicate > with modem using AT commands via ttyUSB ports. > Recently we observed a crash in usb driver interface when we try to > post some AT commands. After the crash the kernel seems to be hanged. > We were not able to execute any commands or open a new tty terminal. > Even reboot command was not working fine. > The system went to completely unusable/unstable state. It recovered > only after hard reboot. > > > > Nov 30 18:59:01 ATCMD = [AT+CMEE=2] > Nov 30 18:59:02 [AT_TRX]Garbage cleared > Nov 30 18:59:02 [AT_TRX]Data from Stream --> [OK] > Nov 30 18:59:02 [AT_TRX]Poll Ended > Nov 30 18:59:02 [AT_TRX]Result :[-1] > > Nov 30 18:59:02 [AT_TRX]Garbage cleared > Nov 30 18:59:02 kernel: [19926.147811] usb 2-1.3: USB disconnect, > device number 126 Your device disconnected itself from the system for some reason, you might want to look into why that happens, could be an electrical issue. > Nov 30 18:59:02 kernel: [19926.147985] sierra ttyUSB0: Sierra USB > modem converter now disconnected from ttyUSB0 > Nov 30 18:59:02 kernel: [19926.148002] sierra 2-1.3:1.0: device disconnected > Nov 30 18:59:02 kernel: [19926.148127] sierra ttyUSB1: Sierra USB > modem converter now disconnected from ttyUSB1 > Nov 30 18:59:02 kernel: [19926.148138] sierra 2-1.3:1.1: device disconnected > Nov 30 18:59:02 kernel: [19926.150070] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.152626] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.155136] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.157589] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.159999] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.162438] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 18:59:02 kernel: [19926.164870] sierra ttyUSB2: > sierra_submit_rx_urbs: submit urb failed: -19 > Nov 30 19:01:12 kernel: [20056.174514] INFO: task khubd:369 blocked > for more than 120 seconds. Not good, what kernel version is this? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
