Re: kern/57965: urtwn(4) command queue can overflow and deadlock

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/57965; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: Ramiro Aceves <ea1abz%gmail.com@localhost>
Cc: gnats-bugs%NetBSD.org@localhost, kern-bug-people%NetBSD.org@localhost,
	gnats-admin%NetBSD.org@localhost, netbsd-bugs%NetBSD.org@localhost
Subject: Re: kern/57965: urtwn(4) command queue can overflow and deadlock
Date: Thu, 29 Feb 2024 15:13:28 +0000

 > Date: Thu, 29 Feb 2024 13:05:09 +0100
 > From: Ramiro Aceves <ea1abz%gmail.com@localhost>
 > 
 > My RaspberryPi Zero W is using now the urtwn driver with a USB WIFI
 > adaptor because of bwfm driver does not function well. I made a
 > service that checks www.google.com and reboots the system if there is
 > no ping,  checking 3 times during  5 min intervals.
 > 
 > With urtwn, network worked fine but router automatic changing channels
 > leaded to complete network loss, needing reboot.
 
 Can you share the output of these commands when it fails, before you
 reboot?
 
 ifconfig urtwn0
 wpa_cli status
 dhcpcd -U urtwn0
 
 The symptom in this PR is that the commands will actually just hang in
 tstile or mutex, and examination with `ps' (either ps(1), or in
 crash(8) or ddb(4)) will show that some process is waiting for
 urtwntsk; the stack trace in crash/ddb will show it is waiting in
 urtwn_stop.
 
 If your symptom does match, there's a good chance this will resolve
 it.
 
 If your symptom doesn't match, can you file a new PR for it?