https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200611

            Bug ID: 200611
           Summary: iwn problems in "40 MHz" mode, Intel Advanced-N 6502
                    on Thinkpad T520
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless@FreeBSD.org
          Reporter: a...@kapranoff.ru

I was fighting for a couple of days trying to connect to my home router from a
fresh FreeBSD box. Was getting an infinite loop of this:

Jun  3 12:40:22 famagusta wpa_supplicant[14564]: wlan0:
CTRL-EVENT-SSID-REENABLED id=0 ssid="Serendipity"
Jun  3 12:40:22 famagusta wpa_supplicant[14564]: wlan0: Trying to associate
with 20:cf:30:ce:1c:85 (SSID='Serendipity' freq=2422 MHz)
Jun  3 12:40:22 famagusta wpa_supplicant[14564]: wlan0: Associated with
20:cf:30:ce:1c:85
Jun  3 12:40:22 famagusta kernel: wlan0: link state changed to UP
Jun  3 12:40:22 famagusta dhclient[14671]: send_packet: No buffer space
available
Jun  3 12:40:30 famagusta kernel: wlan0: link state changed to DOWN
Jun  3 12:40:30 famagusta wpa_supplicant[14564]: wlan0: CTRL-EVENT-DISCONNECTED
bssid=20:cf:30:ce:1c:85 reason=0
Jun  3 12:40:30 famagusta wpa_supplicant[14564]: wlan0: WPA: 4-Way Handshake
failed - pre-shared key may be incorrect
Jun  3 12:40:30 famagusta wpa_supplicant[14564]: wlan0:
CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="SerendipIity" auth_failures=21
duration=120 reason=WRONG_KEY
Jun  3 12:40:30 famagusta dhclient[14671]: send_packet: Invalid argument
Jun  3 12:40:39 famagusta dhclient[14671]: send_packet: Network is down
Jun  3 12:41:19 famagusta last message repeated 3 times
Jun  3 12:42:30 famagusta wpa_supplicant[14564]: wlan0:
CTRL-EVENT-SSID-REENABLED id=0 ssid="Serendipity"
Jun  3 12:42:30 famagusta wpa_supplicant[14564]: wlan0: Trying to associate
with 20:cf:30:ce:1c:85 (SSID='Serendipity' freq=2422 MHz)
Jun  3 12:42:30 famagusta kernel: wlan0: link state changed to UP
Jun  3 12:42:30 famagusta wpa_supplicant[14564]: wlan0: Associated with
20:cf:30:ce:1c:85
Jun  3 12:42:30 famagusta dhclient[14671]: send_packet: No buffer space
available
Jun  3 12:42:37 famagusta last message repeated 2 times
Jun  3 12:42:37 famagusta wpa_supplicant[14564]: wlan0: CTRL-EVENT-DISCONNECTED
bssid=20:cf:30:ce:1c:85 reason=0
Jun  3 12:42:37 famagusta kernel: wlan0: link state changed to DOWN

The machine is a PC-BSD based on 11-CURRENT on a ThinkPad T520 with iwn0:
<Intel Centrino Advanced-N 6205>.

"Serendipity" is an ASUS RT-16N home device configured for "WPA-Auto-Personal"
and "TKIP+AES". It supports 802.11n mode.

There is also a router setting called "Bandwidth" with two options: "40 MHz"
and "20 MHz". It was set to 40 and changing it to 20 resolved all problems.

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