Wifi bug

[Hannu Nyman]

e9hack kirjoitti 26.9.2021 klo 15.48:
> Am 26.09.2021 um 12:54 schrieb Hannu Nyman:
>> e9hack kirjoitti 26.9.2021 klo 10.02:
>>> Am 24.09.2021 um 22:04 schrieb e9hack:
>>>> In the past (a few days ago), it was possible to disable or shut-down 
>>>> wifi by introduce the command 'wifi down'. This doesn't work currently. 
>>>> After some seconds, wifi is start again.
>>>
>>> It may be related to a page fault of netifd. Netifd is restart afterwards:
>>>
>>> [  236.658379] do_page_fault(): sending SIGSEGV to netifd for invalid 
>>> write access to 77cdd048
>>> [  236.666942] epc = 77d7ded5 in libubox.so.20210819[77d78000+18000]
>>> [  236.673212] ra  = 77d7dec9 in libubox.so.20210819[77d78000+18000]
>>>
>>> This occurs after 'wifi down'.
>>
>>
>> Wifi coming up again happens also with R7800 (ipq806x, ath10k), master 
>> build from two days ago.
>>
>>
>> System log shoes wifi goes down, then the whole network stack gets 
>> restarted (?), and finally wifi comes back up.
>>
>>
>>   OpenWrt SNAPSHOT, r17581-2c9a07ed28
>>   -----------------------------------------------------
>> root at router1:~# wifi down; logread -f
>> Sun Sep 26 13:42:39 2021 daemon.notice hostapd: Remove interface 'wlan0'
>> Sun Sep 26 13:42:39 2021 daemon.notice hostapd: wlan0: interface state 
>> ENABLED->DISABLED
>
> Do you see a page fault from netifd in the log? If it does crash, it is 
> restarted by procd. This does restart the network stack.


I do not see any crash in the logs.

But I do see netifd PID first disappearing from the proccess list and then 
re-appearing with a changed PID, so apparently netifd closes/crashes/whatever 
and restarts:

root at router1:~# pgrep netifd
8773
root at router1:~# wifi down
root at router1:~# pgrep netifd
root at router1:~# pgrep netifd
root at router1:~# pgrep netifd
18139