Dear Linux Wireless Community and Gregory Greenman,
I’m writing to bring to your attention a persistent issue affecting Intel AX210
Wi-Fi adapter users. Myself and others across different Linux distributions,
including NixOS and Fedora, have encountered regular system crashes
characterized by `iwlwifi` queue stuck log entries, followed by `rcu_preempt
detected stalls`.
>From discussions on kernel bug trackers and with other users facing the same
problem, it seems this issue might be related to the Wi-Fi adapter halting the
PCIe bus, leading to a system-wide freeze necessitating a hard restart.
I haven't observed any specific circumstances leading to the crash which occurs
irregularly. On Fedora Adam seems to have observed it is the downloading of
large files that is causing it.
Below a brief summary of my system setup and error logs:
```
$ hostnamectl
Static hostname: nixos
Icon name: computer-desktop
Chassis: desktop 🖥
Operating System: NixOS 24.05 (Uakari)
Kernel: Linux 6.7.1
Architecture: x86-64
Hardware Vendor: ASUS
Hardware Model: ROG STRIX X670E-E GAMING WIFI
Firmware Version: 1807
Firmware Date: Thu 2023-12-14
```
```
$ journalctl -b 0 | grep "firmware version"
Jan 30 06:49:29 nixos kernel: iwlwifi 0000:08:00.0: loaded firmware version
86.fb5c9aeb.0 ty-a0-gf-a0-86.ucode op_mode iwlmvm
```
```
$ journalctl -b -1
...
Jan 26 03:24:55 nixos kernel: iwlwifi 0000:08:00.0: Queue 4 is stuck 39108
39109
Jan 26 03:25:00 nixos kernel: sched: RT throttling activated
Jan 26 03:25:11 nixos bluetoothd[1059]: profiles/audio/avdtp.c:cancel_request()
Suspend: Connection timed out (110)
Jan 26 03:25:16 nixos kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/
tasks:
Jan 26 03:25:16 nixos kernel: rcu: 0-....: (8 GPs behind) idle=d6bc/
1/0x4000000000000002 softirq=3077933/3077934 fqs=5080
Jan 26 03:25:16 nixos kernel: rcu: (detected by 3, t=21002 jiffies,
g=14745593, q=886 ncpus=12)
```
Here error log from Adam experiencing same system crash:
```
$ egrep -i 'queue.*is stuck|rcu_preempt' fedora_journalctl_20240116
Jan 15 10:31:58 fedora kernel: iwlwifi 0000:0a:00.0: Queue 4 is stuck 12684
12704
Jan 15 10:32:50 fedora kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/
tasks:
```
For additional information and undertaken troubleshooting steps:
https://bugzilla.kernel.org/show_bug.cgi?id=217990[1]
https://community.intel.com/t5/Wireless/AX210-System-Crash-after-iwlwifi-Queue-Stuck-Error-Issue/m-p/1562147[2]
https://bugzilla.redhat.com/show_bug.cgi?id=2262044[3]
Any guidance, insights, or suggestions for troubleshooting this issue further
would be greatly appreciated.
Thank you for your time and dedication to the Linux wireless ecosystem.
Sincerely,
Chris
--------
[1] https://bugzilla.kernel.org/show_bug.cgi?id=217990
[2] https://community.intel.com/t5/Wireless/AX210-System-Crash-after-iwlwifi-Queue-Stuck-Error-Issue/m-p/1562147
[3] https://bugzilla.redhat.com/show_bug.cgi?id=2262044
