Reloading stats failed: QMI operation failed: Transaction timed out

[Bjørn Mork]

Aleksander Morgado <aleksander at aleksander.es> writes:

>>
>> WARNING: CPU: 1 PID: 0 at /linux-4.10.0/net/sched/sch_generic.c:316 dev_watchdog+0x22c/0x230
>> NETDEV WATCHDOG: wwp0s (qmi_wwan): transmit queue 0 timed out
>>
>
> Oh well, the infamous "transmit queue 0 timed out" error... That is,
> as far as I know, a clear indication of a modem firmware problem; the
> device stopped responding in the USB layer, so the device is probably
> stuck.

Yes, this warning is expected if the modem is stuck.

But I'd like to note that the warning by itself doesn't necessarily
imply that a permanently stuck modem.  It can be triggered under normal
conditions for radio devices.  The warning just says that the TX queue
had to be stopped for more than 5 seconds. This can happen e.g. due to
temporary radio network issues. The driver doesn't know whether the
modem is stuck for 6 seconds or forever when issuing the warning.

Of course, in this case there are other indications that the modem
firmware has locked up, and the warning is definitely a symptom of that
lockup.

Just trying to add some extra context for future google searches :-)
Some people are worried when they see that warning from an otherwise
working modem.  There is no reason to worry in such cases.  It is
perfectly normal and harmless.



Bjørn