[Bug 263632] iwlwifi(4) crashes (freezes) a few seconds after resuming from sleep (suspend/resume not working; workaround known for now)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263632

--- Comment #37 from Jonathan Vasquez <jon@xyinn.org> ---
Hey Bjoern,

I'm on stable/14 (FreeBSD leslie 14.0-STABLE FreeBSD 14.0-STABLE #0
stable/14-n267200-50f771371356: Sat Apr 13 20:23:30 EDT 2024    
root@leslie:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64) and have some
updates.

1. I re-transferred that 684 MB file from my home NAS again using the wireless
card and instead of it taking 14m, it now only took 5m48s, so a big
improvement. Doing some basic 'ls -lh' while it was transferring, it was
basically transferring at about 2 MB per sec.

2. After the above, I tested sleep/resume. The system came back up without
crashing, but the internet connection was broken even though 'ifconfig' said
that it was associated to the network. I then did 4 more sleep/resume in
sequence to see if the system would crash. It didn't :).

3. After those tests were done, I then tested tear down since I remember we
mentioned that the iwlwifi driver/card doesn't like being teared down and it
could crash. So I first did a `service netif restart && service routing
restart` and the internet worked again (doing netif alone wasn't enough, I
needed routing as well.. most likely because I'm using a static ip
configuration:

wlans_iwlwifi0="wlan0"
ifconfig_wlan0="WPA inet 192.168.1.101 netmask 255.255.255.0"
ifconfig_wlan0_ipv6="inet6 accept_rtadv"
defaultrouter="192.168.1.1"
create_args_wlan0="country US regdomain FCC"

I then did two more sleep/resume and it didn't crash (but internet broke
again).

4. After this, I stress tested the tear down by doing the netif/routing
restarts 8 more times in a row. It did not crash.

This is all good news and is an indication that your stability fixes are
working, although I'll need to use it throughout the days/weeks more to see how
stable it actually is. I'll be trying to play around with if_lagg and seeing
how well it works for failover recovery between my ethernet interface that's on
an type c dongle and the built in Intel AX210 wireless card, so I can more
easily switch between locations at home ;).

I did hear that FreeBSD's network stack in general is at an 802.11g level so
regardless of what the driver is (Atheros, Intel, etc), the maximum speed will
be at g speeds. Do you know what's the status with upgrading FreeBSD's wifi
stack to 802.11n/ac/ax? I believe
I read in one of the recent FreeBSD foundation reports that more investments
will start occurring for the wireless network stack specifically. If you have
any links where I can read more up on that, that would be helpful.

Other info (also attached dmesg-2024-04-14-1136):

wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=0
        ether c8:15:4e:aa:6d:92
        inet 192.168.1.101 netmask 0xffffff00 broadcast 192.168.1.255
        inet6 fe80::ca15:4eff:feaa:6d92%wlan0 prefixlen 64 scopeid 0x2
        groups: wlan
        ssid <redacted> channel 40 (5200 MHz 11a) bssid c8:7f:54:b5:d5:f4
        regdomain FCC country US authmode WPA2/802.11i privacy ON
        deftxkey UNDEF AES-CCM 3:128-bit txpower 17 bmiss 7 mcastrate 6
        mgmtrate 6 scanvalid 60 wme roaming MANUAL
        parent interface: iwlwifi0
        media: IEEE 802.11 Wireless Ethernet OFDM/54Mbps mode 11a
        status: associated
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>

- Jonathan

-- 
You are receiving this mail because:
You are on the CC list for the bug.