On Tue, Aug 11, 2015 at 11:58 AM, Bjørn Mork <[email protected]> wrote: > [replaced 'netdev' with 'linux-usb' as this concerns a USB serial driver only] > > Yegor Yefremov <[email protected]> writes: > >> I have following problem. When removing USB dongle 07d1:3e01 or >> SierraWireless MC7304 I get following messages: >> >> option1 ttyUSB10: option_instat_callback: error -71 >> option1 ttyUSB9: option_instat_callback: error -71 >> option1 ttyUSB10: option_instat_callback: error -71 >> option1 ttyUSB9: option_instat_callback: error -71 >> option1 ttyUSB10: option_instat_callback: error -71 >> option1 ttyUSB9: option_instat_callback: error -71 >> INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by 0, >> t=2102 jiffies, g=694, c=693, q=24) >> INFO: Stall ended before state dump start >> option1 ttyUSB10: option_instat_callback: error -71 >> >> drivers/usb/serial/option.c seems to make nothing with such a status >> and just prints error. How one would handle this properly and just >> unregister device? Do you need more info? >> >> Tested kernels: 3.18.20 and 4.2.0-rc5 (this kernel shows only RCU stall >> crash) >> Hardware: TI am335x > > > Isn't the device unregistered? What else can be done here?
The problem is, that the system is dead (stall). It only prints "option1 ttyUSB10: option_instat_callback: error -71" endlessly (kernel 3.18.20) and console shows no reaction for input. And when you start watchdog from userspace the systems reboots after specified timeout (watchdog -t 5 -T 10 /dev/watchdog). Yegor -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
