[Bug 221496] KERNEL PANIC with iwn driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221496

            Bug ID: 221496
           Summary: KERNEL PANIC with iwn driver
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: vermaden at interia.pl

Hi,

I am able to KERNEL PANIC the latest FreeBSD 11.1-RELEASE-p1 with using these
two scripts.

# cat netdown.sh
killall -9 wpa_supplicant
killall -9 ppp
killall -9 dhclient
ifconfig wlan0 destroy
ifconfig em0 down
/etc/rc.d/netif onerestart

# cat netup.sh
killall -9 wpa_supplicant
killall -9 ppp
killall -9 dhclient
ifconfig wlan0 destroy
ifconfig em0 down
/etc/rc.d/netif onerestart
ifconfig wlan0 create wlandev iwn0
ifconfig wlan0 ether 00:1e:bd:a5:61:2b
ifconfig wlan0 up
wpa_supplicant -i wlan0 -c /etc/wpa_supplicant.conf -s -B
dhclient wlan0

Sometimes its not that instant and works after several minutes, but when You
randomly start each of them, then the panic would occur, for example like that:

# netup.sh &
# netup.sh &
# netdown.sh &
# netup.sh &
# netdown.sh &
# netdown.sh &
# netup.sh &
# netdown.sh &
# netup.sh &
# netdown.sh &
...


The wireless card is 'Centrino Advanced-N 6205 [Taylor Peak]' in ThinkPad T520.

Its probably not 'em' driver related but I left it there because these are the
commands that I actually execute.

The MAC in the above script is generated (but with first three octets from real
OUI).

Regards,
vermaden

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