WARNING in nl80211 when connecting to wifi on Jetson Xavier NX

[brgl]

When connecting to the wifi network with wpa_supplicant on Jetson Xavier NX, the following warning is emitted:

[   13.364004] ------------[ cut here ]------------
[   13.364219] WARNING: CPU: 0 PID: 4434 at net/wireless/nl80211.c:14141 cfg80211_ch_switch_notify+0x138/0x158 [cfg80211]
[   13.364396] Modules linked in: rtl8822ce mttcan rtk_btusb can_dev btusb btrtl btbcm btintel cfg80211 spidev nvgpu overlay
[   13.364681] 
[   13.364717] CPU: 0 PID: 4434 Comm: RTW_CMD_THREAD Not tainted 4.9.201-l4t-r32.5+ge443483e8c9c #1
[   13.364860] Hardware name: NVIDIA Jetson Xavier NX Developer Kit (DT)
[   13.364968] task: ffffffc1efd57000 task.stack: ffffffc1d9c74000
[   13.365145] PC is at cfg80211_ch_switch_notify+0x138/0x158 [cfg80211]
[   13.365746] LR is at rtw_cfg80211_ch_switch_notify+0x94/0x98 [rtl8822ce]
[   13.365866] pc : [<ffffff8001169eb0>] lr : [<ffffff8001328fc0>] pstate: 60c00045
[   13.365991] sp : ffffffc1d9c77c30
[   13.366054] x29: ffffffc1d9c77c30 x28: 0000000000000000 
[   13.366163] x27: ffffff80012bc190 x26: ffffffc1dbabd200 
[   13.366466] x25: ffffff800bf721bc x24: 0000000000000000 
[   13.366886] x23: ffffffc1da779000 x22: ffffffc1efd7b400 
[   13.368562] x21: ffffffc1da78b800 x20: 0000000000000001 
[   13.374338] x19: ffffffc1d9c77cb8 x18: 0000000000000000 
[   13.380023] x17: 0000000000000002 x16: 0000000000000000 
[   13.385710] x15: 0000000000000030 x14: 0000000000000008 
[   13.391650] x13: 7f1201c7fffc002a x12: 0105c00363fffa03 
[   13.397338] x11: 0000000000000004 x10: 0000000000000002 
[   13.403025] x9 : 0000000000000004 x8 : ffffffc1d9c77d4a 
[   13.408801] x7 : 0000000000000000 x6 : 0000000000000001 
[   13.414312] x5 : 0000000000000040 x4 : ffffffc1da78d748 
[   13.419650] x3 : 000000000000143c x2 : 0000000000000001 
[   13.424988] x1 : 0000145a00000003 x0 : 0000000000000000 
[   13.430073] 
[   13.431727] ---[ end trace 90ada372a32d1e76 ]---
[   13.436191] Call trace:
[   13.438725] [<ffffff8001169eb0>] cfg80211_ch_switch_notify+0x138/0x158 [cfg80211]
[   13.446037] [<ffffff8001328fc0>] rtw_cfg80211_ch_switch_notify+0x94/0x98 [rtl8822ce]
[   13.453204] [<ffffff80012bc0fc>] rtw_chk_start_clnt_join+0x424/0x4b8 [rtl8822ce]
[   13.460457] [<ffffff80012bc3c8>] join_cmd_hdl+0x238/0x328 [rtl8822ce]
[   13.466310] [<ffffff800127a4dc>] rtw_cmd_thread+0x3f4/0x5f8 [rtl8822ce]
[   13.471987] [<ffffff80080d9d7c>] kthread+0xec/0xf0
[   13.476795] [<ffffff80080838a0>] ret_from_fork+0x10/0x30

This doesn't seem to cause any problems with connectivity. The kernel revision is: e443483e8c9c25d878caf33e7b97193eee22fef2 and the system is just regular yocto system based on meta-tegra.

[madisongh]

It is just a WARN_ON, but it looks like there was a change in the 80211 core code that expects some different behavior from drivers than before. The realtek drivers that NVIDIA imported may not have the corresponding change. Might be worth investigating. Upstream change that added this warning is here. Looks like it came in when NVIDIA patched in the update to 4.9.201.

[jchillerup]

Replying in the thread to say I'm also seeing the same dumps in my dmesg (and to subscribe to the thread). Hard to say if the issue affects performance, since we're also battling a performance issue. Could be unrelated.

[dat-tran-matternet]

Any updates with this issue? I am also seeing the same with the latest kernel updates from dunfell 4.9.253-l4t-r32.6

thanks

[Gabryss]

It seems that this issue is still there. I am using a Jetson Nano with the kernel version 4.9.253 tegra running on ubuntu 20. How can we approach this ?

[sheuschkel]

I have similar dumps in my logfiles and then I get an "CTRL-EVENT-SCAN-FAILED ret=-16" error and no wifi networks can be found until a reboot.

[ichergui]

Hello @sheuschkel
Could you please share the branch you are using and steps you followed to creat an access point ?
I tried to creat an access point in past and it was working fine to me on my Jetson Xavier NX

[eldo-frederick]

It seems that this issue is still there. I am using a Jetson Nano with the kernel version 4.9.253 tegra running on ubuntu 20.

Hello @Gabryss
I am facing the same issue in Jetson nano and same kernel version and wifi disconnects and not connecting back. Have you resolved the issue?