FS#3947 - Wifi STA that loses AP signal takes down the whole router, sometimes rebooting it #8943
Labels
flyspray
kernel
pull request/issue with Linux kernel related changes
release/21.02
pull request/issue targeted (also) for OpenWrt 21.02 release
slick_diligence:
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
Test case:
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.
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