[FS#3947] Wifi STA that loses AP signal takes down the whole router, sometimes rebooting it

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - slick_diligence (slick_diligence) 

Attached to Project - OpenWrt/LEDE Project
Summary - Wifi STA that loses AP signal takes down the whole router, sometimes rebooting it
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Initially reported on forum: https://forum.openwrt.org/t/wifi-client-disconnecting-takes-the-whole-wifi-ap-down-on-21-02-snapshot-how-to-debug/102094/8

Device: Asus RT-N56U
Branch: openwrt-21.02, initial report commit 60fad8f (v21.02.0-rc3-74-g60fad8f82b)

Observation: when a wifi client disconnects that appears to see the AP with low signal strength, the whole AP goes down. Verified with airmon/tcpdump that AP beacons stop. Reboot of the router also observed when log_level set to 2 or lower.

Bisecting, commit https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=a078037ace50 (v21.02.0-rc3-35-ga078037ace) seems to be the issue:


    mac80211: improve rate control performance

    Call rate control handler after intermediate queueuing
    Includes follow-up fixes


Test case:

1. Connect to AP
2. Move far away or shield mobile so the AP signal drops significantly as seen by mobile
3. Viewing the wifi networks of the mobile (android), if when signal drops below some threshold:
4.1 AP disappears from list: FAIL [the router also reboots]
4.2 AP moves from "Connected" to "Saved": PASS

I did not have these issues at all in May 2021 using the dev snapshot. I updated to the July 2021 dev snapshot, observed the issue, then built openwrt-21.02 and still observed the issue.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3947

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