[Bug 287625] net80211: kernel panic with 11ac support but no 11n

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287625

--- Comment #6 from Vyacheslav <terehovv@mail.ru> ---
> I'll look at the crash in a minute
In my rc.conf there is a line 'netif_enable="NO"'
About a minute after the system was started and I executed "service netif
onestart" manually. This allowed me to separate the log into two parts, before
and after the network was started. The kernel panic occurred immediately as
soon as wpa_suppliant found a match ssid.

> you need to run fwget to get the firmware installed which also sets the loader configuration (don't do it manually).
Yes, I ran fwget, the wifi-firmware-iwlwifi-kmod-ax210-20241017.1402000_2
package was installed. The entries in /boot/loader.conf.d/iwlwifi-ax210.conf
were added by the package, I just supplemented them with parameters for
debugging.

> That means you also need to remove you manual loader.conf entries as you enabled 11ac but keep 11n disabled.
I used these sysctls to avoid changing the AP settings. It also convinced me
that the problem was only with 802.11ac.

> If I am not mistaken this is a logic error introduced in 51172f62a753f in net80211
> for cases where VHT is avail but HT would be not (which normally should not be the case).
If I disable 802.11ac (via sysctl or AP settings) - I have a chance to connect:
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
    options=0
    ether 44:e5:17:b9:eb:14
    inet 10.0.1.71 netmask 0xffffff00 broadcast 10.0.1.255
    groups: wlan
    ssid test5ghz channel 52 (5260 MHz 11a ht/40+) bssid cc:9d:a2:e2:3e:c0
    regdomain NONE country RU authmode WPA2/802.11i privacy ON
    deftxkey UNDEF AES-CCM 2:128-bit txpower 24 bmiss 7 mcastrate 6
    mgmtrate 6 scanvalid 60 -ampdutx ampdurx ampdulimit 64k ampdudensity 2
    -amsdutx amsdurx shortgi -ldpctx ldpcrx -uapsd wme roaming MANUAL
    parent interface: iwlwifi0
    media: IEEE 802.11 Wireless Ethernet OFDM/36Mbps mode 11na
    status: associated
    nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
I see "11a ht/40+" here. I hope this helps somehow.

> I would assume once you fix your loader.conf entries to fall back to the automatic configuration provided by the firmware package, the problem will go away.
I changed the /etc/loader.conf:
boot_verbose="YES"
kern.msgbufsize=1146880
In the /boot/loader.conf.d/iwlwifi-ax210.conf the default values:
compat.linuxkpi.80211.hw_crypto=1
compat.linuxkpi.iwlwifi_11n_disable=0
compat.linuxkpi.iwlwifi_disable_11ac=0
In rc.conf I set 'netif_enable="YES"', the
wifi-firmware-iwlwifi-kmod-ax210-20241017.1402000_2 package is installed.
In the access point settings for 5 GHz, standards A, N, AC are enabled;
channels 36-64; encryption WPA2.
Unfortunately, the problem remains (see attachments 261392, 261393).
Note on messages_a_n_ac log: after kernel panic I booted into single user mode
and changed ssid in wpa_supplicant.conf, after which the system booted
successfully.

Perhaps I need to clarify: if the AP provides 802.11ac, its ssid is specified
in wpa_suppliant.conf and compat.linuxkpi.iwlwifi_disable_11ac=0 - I get a
kernel panic.

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