[Bug 291621] iwx(4) hangs on a lot of outgoing ssh traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291621

--- Comment #7 from Alexander Shursha <freebsd@vibro-lnr.ru> ---
(In reply to Adrian Chadd from comment #6)
first wlanstats:

2                 rx from wrong bssid
1                 rx discard mgt frames
750               rx beacon frames
1                 rx required element missing
5155              rx element unknown
1                 rx frame chan mismatch
773               tx failed 'cuz no defkey
1                 active scans started
758               rx management frames
2                 rx action frames
1                 tx failed 'cuz vap not in RUN state
31                total data frames received
14                unicast data frames received
17                multicast data frames received
14                total data frames transmit
14                unicast data frames sent
40.5M             current transmit rate
51.0              current rssi
-127              current noise floor (dBm)
-76.0             current signal (dBm)

second wlanstats:
2                 rx from wrong bssid
1                 rx discard mgt frames
2607              rx beacon frames
1                 rx required element missing
18154             rx element unknown
1                 rx frame chan mismatch
2673              tx failed 'cuz no defkey
1                 active scans started
2616              rx management frames
3                 rx action frames
3                 A-MPDU frames held in reorder q
3                 A-MPDU frames rx out-of-order
2                 A-MPDU frames discarded for out of range seqno
1                 tx failed 'cuz vap not in RUN state
999               total data frames received
939               unicast data frames received
60                multicast data frames received
1375              total data frames transmit
1375              unicast data frames sent
13.5M             current transmit rate
54.0              current rssi
-105              current noise floor (dBm)
-51.0             current signal (dBm)

dmesg after ping show many:
wlan0: [ff:ff:ff:ff:ff:ff] no default transmit key (ieee80211_crypto_get_txkey)
deftxkey 65535
wlan0: [ff:ff:ff:ff:ff:ff] no default transmit key (ieee80211_crypto_get_txkey)
deftxkey 65535

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