Created attachment 201356 [details] Panic backtrace It's an RTL8821AU - driven by rtwn_usb(4) (however, I don't think this matters); after some scan testing (wlandebug scan) I've done: ifconfig wlan0 down [~1 second pause] ifconfig wlan0 destroy The panic backtrace / kdb was shown instantly after the last command.
The backtrace has no net80211 / driver calls; I think it's something net-specific.
Comment on attachment 201356 [details] Panic backtrace Hi, I think this issue is another variant of: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233535 Can you try the latest 13-current ? --HPS
https://svnweb.freebsd.org/changeset/base/343394 Try this patch. --HPS
Everything is okay after update (r343473), thanks!