kern/57561: iwm device timeouts

[bsdprg%tuta.io@localhost]

>Number:         57561
>Category:       kern
>Synopsis:       iwm device timeouts
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 04 05:35:00 +0000 2023
>Originator:     Salil Wadnerkar
>Release:        HEAD
>Organization:
>Environment:
NetBSD latitude 10.99.7 NetBSD 10.99.7 (MYKERNEL) #1: Thu Aug  3 19:24:20 PDT 2023  swadnerkar@latitude:/usr/obj/sys/arch/amd64/compile/MYKERNEL amd64
>Description:
Every tens of minutes or sometimes after a few minutes, iwm interface times out resulting in loss of connectivity. 
>How-To-Repeat:
This is an intermittent problem. It occurs at least once in an hour, and sometimes multiple times in an hour. I believe anyone using iwm interface should be experiementing these frustrating timeouts which result in loss of connectivity.
>Fix:
The workaround is to execute the following twice:
doas ifconfig iwm0 down
doas ifconfig iwm0 up

It needs to be executed twice, because after the first down and up, I get:
ifconfig: exec_matches: Resource temporarily unavailable