[Bug 213621] WIFI connection is lost periodically on ath0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213621

--- Comment #3 from Sergey <kpect at protonmail.com> ---
Hi Adrian.

Below is what I got. Up till TSFOOR line in dmesg is what came out when the
link disapperared. 
Starting from 'wlan0: _ieee80211_crypto_delkey: NONE keyix 65535 flags 0x3 rsc
0 tsc 0 len 0' came out after initiating reassociate in wpa_cli.

$ doas wlandebug +assoc +state +auth +crypto
net.wlan.0.debug: 0x0 => 0x10c80000<crypto,assoc,auth,state>

$ sysctl net.wlan.0.debug
net.wlan.0.debug: 281542656


$ dmesg
...
wlan0: link state changed to UP
wlan0: beacon miss, mode STA state RUN
ath0: ath_intr: TSFOOR                                                         
   <- no traffic here
wlan0: _ieee80211_crypto_delkey: NONE keyix 65535 flags 0x3 rsc 0 tsc 0 len 0  
   <- 'reassociate' command started here (traffic is available again)
wlan0: _ieee80211_crypto_delkey: AES-CCM keyix 2 flags 0x106 rsc 34643 tsc 0
len 16
wlan0: _ieee80211_crypto_delkey: AES-CCM keyix 4 flags 0x103 rsc 0 tsc 89273
len 16
wlan0: [a0:f3:c1:46:1a:f3] station assoc via MLME
wlan0: [a0:f3:c1:46:1a:f3] switch station to HT40 channel 2452/0x40480
wlan0: ieee80211_new_state_locked: RUN -> ASSOC (nrunning 0 nscanning 0)
wlan0: ieee80211_newstate_cb: RUN -> ASSOC arg 1
wlan0: sta_newstate: RUN -> ASSOC (1)
wlan0: link state changed to DOWN
wlan0: [a0:f3:c1:46:1a:f3] station assoc via MLME
wlan0: [a0:f3:c1:46:1a:f3] switch station to HT40 channel 2452/0x40480
wlan0: ieee80211_new_state_locked: ASSOC -> AUTH (nrunning 0 nscanning 0)
wlan0: ieee80211_newstate_cb: ASSOC -> AUTH arg 192
wlan0: sta_newstate: ASSOC -> AUTH (192)
wlan0: [a0:f3:c1:46:1a:f3] recv auth frame with algorithm 0 seq 2
wlan0: ieee80211_new_state_locked: AUTH -> ASSOC (nrunning 0 nscanning 0)
wlan0: ieee80211_newstate_cb: AUTH -> ASSOC arg 0
wlan0: sta_newstate: AUTH -> ASSOC (0)
wlan0: [a0:f3:c1:46:1a:f3] assoc success at aid 2: short preamble, short slot
time, QoS, HT40 (+AMPDU)
wlan0: ieee80211_new_state_locked: ASSOC -> RUN (nrunning 0 nscanning 0)
wlan0: ieee80211_newstate_cb: ASSOC -> RUN arg 16
wlan0: sta_newstate: ASSOC -> RUN (16)
wlan0: link state changed to UP
wlan0: ieee80211_crypto_newkey: cipher 3 flags 0x3 keyix 65535
wlan0: ieee80211_crypto_setkey: AES-CCM keyix 4 flags 0x103 mac
a0:f3:c1:46:1a:f3 rsc 0 tsc 0 len 16
wlan0: ieee80211_crypto_newkey: cipher 3 flags 0x6 keyix 2
wlan0: ieee80211_crypto_setkey: AES-CCM keyix 2 flags 0x106 mac
ff:ff:ff:ff:ff:ff rsc 34673 tsc 0 len 16

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