USB to serial(ttyUSB) port crash in debian. task khubd:369 blocked for more than 120 seconds
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 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: [19926.15] 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. Nov 30 19:01:12 kernel: [20056.176931] Tainted: G O 3.12.0.custom-1.3 #2 Nov 30 19:01:12 kernel: [20056.179297] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Nov 30 19:01:12 kernel: [20056.181648] khubd D 880409a3f3c8 0 369 2 0x Nov 30 19:01:12 kernel: [20056.181653] 880409a3f0c0 0046 88040b573780 Nov 30 19:01:12 kernel: [20056.181655] 880032f1ffd8 880032f1ffd8 880032f1ffd8 880409a3f0c0 Nov 30 19:01:12 kernel: [20056.181657] 8000 88035aafc9e8 88035aafc9ec 880409a3f0c0 Nov 30 19:01:12 kernel: [20056.181660] Call Trace: Nov 30 19:01:12 kernel: [20056.181667] [] ? schedule_preempt_disabled+0x9/0x10 Nov 30 19:01:12 kernel: [20056.181670] [] ? __mutex_lock_slowpath+0x141/0x1c0 Nov 30 19:01:12 kernel: [20056.181673] [] ? mutex_lock+0x16/0x30 Nov 30 19:01:12 kernel: [20056.181685] [] ? usb_serial_disconnect+0x2e/0x120 [usbserial] Nov 30 19:01:12 kernel: [20056.181699] [] ? usb_unbind_interface+0x6a/0x1c0 [usbcore] Nov 30 19:01:12 kernel: [20056.181705] [] ? __device_release_driver+0x79/0xf0 Nov 30 19:01:12 kernel: [20056.181707] [] ? bus_get_device_klist+0x10/0x10 Nov 30 19:01:12 kernel: [20056.181709] [] ? device_release_driver+0x25/0x40 Nov 30 19:01:12 kernel: [20056.181712] [] ? bus_remove_device+0xf2/0x140 Nov 30 19:01:12 kernel: [20056.181714] [] ? device_del+0x115/0x1a0 Nov 30 19:01:12 kernel: [20056.181722] [] ? usb_disable_device+0x94/0x1d0 [usbcore] Nov 30 19:01:12 kernel: [20056.181728] [] ? usb_disconnect+0x8e/0x190 [usbcore] Nov 30 19:01:12 kernel: [20056.181734] [] ? hub_thread+0x422/0x1380 [usbcore] Nov 30 19:01:12 kernel: [20056.181738] [] ? __schedule+0x2de/0x770 Nov 30 19:01:12 kernel: [20056.181740] [] ? finish_wait+0x90/0x90 Nov 30 19:01:12 kernel: [20056.181747] [] ? hub_port_debounce+0xe0/0xe0 [usbcore] Nov 30 19:01:12 kernel: [20056.181750] [] ? kthread+0xb3/0xc0 Nov 30 19:01:12 kernel: [20056.181753] [] ? hrtimer_get_remaining+0x20/0x50 Nov 30 19:01:12 kernel: [20056.181756] [] ? kthread_create_on_node+0x110/0x110 Nov 30 19:01:12 kernel: [20056.181758] [] ? ret_from_fork+0x7c/0xb0 Nov 30 19:01:12 kernel: [20056.181761] [] ? kthread_create_on_node+0x110/0x110 Regards, Saravanan N -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: USB to serial(ttyUSB) port crash in debian. task khubd:369 blocked for more than 120 seconds
Our device went for reset. So it starts loading and unloading the serial USB port. Here the serious concern is kernel lock. Once it happens the system is unusable and hard reboot is the only way of recovering it. Kernel version is 3.12.0 Regards, Saravanan N On Wed, Dec 9, 2015 at 2:21 PM, Greg KH <gre...@linuxfoundation.org> wrote: > 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: [19926.15] 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
