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ramips-mt7621: MT7915e - wifi crashes randomly #3154
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This bug is also confirmed for the the D-Link DAP-X1860 a1 running with gluon v2023.1.1: A warning message with
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My cronjob basically seems to work - but... Let's have a look in your graph. We can see crash at ~23:15 and continued to work at ~00:50. Until 23:17 everything's fine. Sun May 26 23:18:04 first timeout message from timer. So here's the Problem for the workaround.
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Bug report
What is the problem?
Some devices in ramips-mt7621, (e.g. COVR-X1860, Multy WSM20, NWA50AX, NWA55AXE) are rarely affected by openwrt/openwrt#11931
but the devices work well for weeks most of the time.
An example of this issue can be seen here:
https://grafana.ffac.rocks/d/000000002/node?orgId=1&var-node=0c0e76cf3bca&from=1704723079634&to=1704773255949
https://grafana.ffac.rocks/d/000000002/node?orgId=1&var-node=0c0e76cf2add&from=1699421650829&to=1701080735177
https://stats.ffmuc.net/d/hRIn3dRWk/mesh-nodes?orgId=1&var-nodeid=b8eca3e24c3f&from=1700938800000&to=1701032400000
The airtime is reported as 0 which is wrong.
A error log is found here: openwrt/openwrt#11931 (comment)
End users can not connect to this broken wifi, but can still see it.
It seems that some devices are affected more often than others.
The DAP-X1860 which has the same chip but is supported within v22.03 never had this issue.
What is the expected behaviour?
Wifi should work reliable for devices with MT7915e driver
Gluon Version:
This has been seen with Wifi6 devices using the MT7915e wifi chip since Openwrt 23.05 (gluon v2023.2.x)
I have not seen this behavior on a device on v22.03 or gluon v2023.1.x yet?
I can confirm this bug still exists on the tag v2023.2
Site Configuration:
FFAC, FFMUC
Workarounds
If this happens and you have SSH access through the WAN/VPN, you can run:
rmmod mt7915e && modprobe mt7915e && wifi
This restarts the wifi driver and fixes this issue temporarily.
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