On Tue, Aug 11, 2015 at 11:58 AM, Bjørn Mork <bjorn@xxxxxxx> wrote:
> [replaced 'netdev' with 'linux-usb' as this concerns a USB serial driver only]
>
> Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> 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
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