FS#3989 - MT76x2E randomly restarts on Xiaomi Mi Router 4A Gigabit Edition

[openwrt-bot]

aleatoricLilac:

Device: Xiaomi Mi Router 4A Gigabit Edition (MT7612)
OpenWrt version: 21.02.0-rc4 r16256-2d5ee43dc6

5GHz wireless appears to encounter message timeouts and restarts seemingly randomly; dmesg is as follows:

[19753.943374] mt76x2e 0000:01:00.0: MCU message 1f (seq 11) timed out
[19753.988543] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[19753.988561] mt76x2e 0000:01:00.0: Build: 1
[19753.988569] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[19754.003378] mt76x2e 0000:01:00.0: Firmware running!
[19754.007557] ieee80211 phy1: Hardware restart was requested

[25595.538192] mt76x2e 0000:01:00.0: MCU message 1f (seq 12) timed out
[25595.583343] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[25595.583360] mt76x2e 0000:01:00.0: Build: 1
[25595.583368] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[25595.598154] mt76x2e 0000:01:00.0: Firmware running!
[25595.602399] ieee80211 phy1: Hardware restart was requested

Configuration is a single SSID in AP mode with no changes to default settings other than security set to WPA2-PSK/CCMP (AES).

[openwrt-bot]

gstammw:

Bug confirmed on OpenWrt 21.02.0 FINAL

[76474.759778] ieee80211 phy1: Hardware restart was requested
[79380.111752] mt76x2e 0000:01:00.0: MCU message 1f (seq 7) timed out
[79380.156926] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[79380.162432] mt76x2e 0000:01:00.0: Build: 1
[79380.166620] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[79380.187734] mt76x2e 0000:01:00.0: Firmware running!
[79380.195918] ieee80211 phy1: Hardware restart was requested
[79390.408570] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[79390.414081] mt76x2e 0000:01:00.0: Build: 1
[79390.418232] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[79390.439410] mt76x2e 0000:01:00.0: Firmware running!
[79390.447576] ieee80211 phy1: Hardware restart was requested
[80761.349345] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[80761.354896] mt76x2e 0000:01:00.0: Build: 1
[80761.359040] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[80761.380167] mt76x2e 0000:01:00.0: Firmware running!


[openwrt-bot]

gormih:

[ 0.000000] Linux version 5.4.154 (builder@buildhost) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r16325-88151b8303)) #0 SMP Sun Oct 24 09:01:35 2021
[ 0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[ 0.000000] printk: bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[ 0.000000] MIPS: machine is Xiaomi Mi Router 4A Gigabit Edition

......

[90427.178591] mt76x2e 0000:01:00.0: Firmware running!
[90427.186750] ieee80211 phy1: Hardware restart was requested
[90502.472814] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90502.478324] mt76x2e 0000:01:00.0: Build: 1
[90502.482483] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90502.503650] mt76x2e 0000:01:00.0: Firmware running!
[90502.511806] ieee80211 phy1: Hardware restart was requested
[90534.643543] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90534.649050] mt76x2e 0000:01:00.0: Build: 1
[90534.653204] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90534.674385] mt76x2e 0000:01:00.0: Firmware running!
[90534.682627] ieee80211 phy1: Hardware restart was requested
[90565.666303] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90565.671808] mt76x2e 0000:01:00.0: Build: 1
[90565.675994] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90565.697191] mt76x2e 0000:01:00.0: Firmware running!
[90565.705338] ieee80211 phy1: Hardware restart was requested
[90599.081026] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90599.086603] mt76x2e 0000:01:00.0: Build: 1
[90599.090752] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90599.111856] mt76x2e 0000:01:00.0: Firmware running!
[90599.120046] ieee80211 phy1: Hardware restart was requested
[90650.387011] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90650.392517] mt76x2e 0000:01:00.0: Build: 1
[90650.396694] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90650.417850] mt76x2e 0000:01:00.0: Firmware running!
[90650.426075] ieee80211 phy1: Hardware restart was requested
[90777.502069] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[90777.507598] mt76x2e 0000:01:00.0: Build: 1
[90777.511748] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[90777.532960] mt76x2e 0000:01:00.0: Firmware running!
[90777.541109] ieee80211 phy1: Hardware restart was requested

[openwrt-bot]

laigor:

Logged kernel panic:
[Mon Jan 31 17:53:19 2022] ieee80211 phy1: Hardware restart was requested
[Mon Jan 31 17:53:24 2022] mt76x2e 0000:01:00.0: MCU message 1f (seq 12) timed out
[Mon Jan 31 17:53:24 2022] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[Mon Jan 31 17:53:24 2022] mt76x2e 0000:01:00.0: Build: 1
[Mon Jan 31 17:53:24 2022] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[Mon Jan 31 17:53:24 2022] mt76x2e 0000:01:00.0: Firmware running!
[Mon Jan 31 17:53:24 2022] ieee80211 phy1: Hardware restart was requested
[Mon Jan 31 17:53:30 2022] mt76x2e 0000:01:00.0: MCU message 1f (seq 14) timed out
[Mon Jan 31 17:53:30 2022] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[Mon Jan 31 17:53:30 2022] mt76x2e 0000:01:00.0: Build: 1
[Mon Jan 31 17:53:30 2022] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[Mon Jan 31 17:53:30 2022] mt76x2e 0000:01:00.0: Firmware running!
[Mon Jan 31 17:53:30 2022] ieee80211 phy1: Hardware restart was requested
[Mon Jan 31 17:53:31 2022] mt76x2e 0000:01:00.0: MCU message 02 (seq 2) timed out
[Mon Jan 31 17:53:32 2022] mt76x2e 0000:01:00.0: MCU message 1f (seq 3) timed out
[Mon Jan 31 17:53:32 2022] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[Mon Jan 31 17:53:32 2022] mt76x2e 0000:01:00.0: Build: 1
[Mon Jan 31 17:53:32 2022] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[Mon Jan 31 17:53:32 2022] mt76x2e 0000:01:00.0: Firmware running!
[Mon Jan 31 17:53:32 2022] ieee80211 phy1: Hardware restart was requested
[Mon Jan 31 17:53:37 2022] mt76x2e 0000:01:00.0: MCU message 1f (seq 4) timed out
[Mon Jan 31 17:53:37 2022] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[Mon Jan 31 17:53:37 2022] mt76x2e 0000:01:00.0: Build: 1
[Mon Jan 31 17:53:37 2022] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[Mon Jan 31 17:53:37 2022] mt76x2e 0000:01:00.0: Firmware running!
[Mon Jan 31 17:53:37 2022] ieee80211 phy1: Hardware restart was requested
.........
[Mon Jan 31 17:55:10 2022] skbuff: skb_under_panic: text:285d9eda len:66 put:2 head:2904025b data:834a74a9 tail:0x85079c40 end:0x85079f00 dev:wlan1
[Mon Jan 31 17:55:10 2022] Kernel bug detected[#1]:
[Mon Jan 31 17:55:10 2022] CPU: 2 PID: 872 Comm: mt76-tx phy1 Tainted: G W 5.4.171 #0
[Mon Jan 31 17:55:10 2022] $ 0 : 00000000 00000001 00000078 00000000
[Mon Jan 31 17:55:10 2022] $ 4 : 8101c34c 8101c34c 81021070 00000000
[Mon Jan 31 17:55:10 2022] $ 8 : 316e616c 00000414 66393730 64203030


[openwrt-bot]

laigor:

I compile 21.02 with fresh mt76 dated 2022-01-31 and the problem is gone.