openwrt / openwrt/mt76

MT7621: Wifi 5ghz crash after sometime

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Description

First of all, I don't have much technical know how so forgive me.

Second of all, the problem is the wifi 5 crashes after a while

This problem does not exist in Openwrt 23

Issue is mentioned here too
https://github.com/openwrt/openwrt/issues/17943

Other devices with same hardware reporting the same

https://forum.openwrt.org/t/newifi-3d2-wifi-error-5ghz/236861

https://forum.openwrt.org/t/i-got-wifi-problem-with-openwrt-24-10-stable/224833

root@OpenWrt:~# ubus call system board
{
"kernel": "6.6.93",
"hostname": "OpenWrt",
"system": "MediaTek MT7621 ver:1 eco:3",
"model": "Xiaomi Mi Router 3G",
"board_name": "xiaomi,mi-router-3g",
"rootfs_type": "squashfs",
"release": {
"distribution": "OpenWrt",
"version": "24.10.2",
"revision": "r28739-d9340319c6",
"target": "ramips/mt7621",
"description": "OpenWrt 24.10.2 r28739-d9340319c6",
"builddate": "1750711236"
}

root@OpenWrt:~# cat /etc/config/network
config interface 'loopback'
        option device 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'
config globals 'globals'
        option ula_prefix 'fd75:8177:b997::/48'
        option packet_steering '1'
config device
        option name 'br-lan'
        option type 'bridge'
        list ports 'lan1'
        list ports 'lan2'
config interface 'lan'
        option device 'br-lan'
        option proto 'static'
        option ipaddr '192.168.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'
config interface 'wan'
        option device 'wan'
        option proto 'dhcp'
config interface 'wan6'
        option device 'wan'
        option proto 'dhcpv6'

root@OpenWrt:~# cat /etc/config/wireless
config wifi-device 'radio0'
        option type 'mac80211'
        option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
        option band '2g'
        option channel '1'
        option htmode 'HT40'
        option disabled '0'
        option cell_density '0'
        option noscan '1'
        option country 'IN'
        option txpower '24'
config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'BATMAN2'
        option encryption 'psk2+ccmp'
        option disabled '0'
        option key '^ZUOS$DHM2$u'
        option isolate '1'
        option macaddr 'random'
        option wpa_disable_eapol_key_retries '1'
config wifi-device 'radio1'
        option type 'mac80211'
        option path '1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0'
        option band '5g'
        option channel '36'
        option htmode 'VHT80'
        option cell_density '0'
        option noscan '1'
        option country 'IN'
config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid 'BATCAVE'
        option encryption 'sae'
        option isolate '1'
        option macaddr 'random'
        option key '1q2w3e4r5t@@'
        option wpa_disable_eapol_key_retries '1'
        option ocv '1'

root@OpenWrt:~# cat /etc/config/dhcp
config dnsmasq
        option domainneeded '1'
        option boguspriv '1'
        option filterwin2k '0'
        option localise_queries '1'
        option rebind_protection '1'
        option rebind_localhost '1'
        option local '/lan/'
        option domain 'lan'
        option expandhosts '1'
        option nonegcache '0'
        option cachesize '1000'
        option authoritative '1'
        option readethers '1'
        option leasefile '/tmp/dhcp.leases'
        option resolvfile '/tmp/resolv.conf.d/resolv.conf.auto'
        option nonwildcard '1'
        option localservice '1'
        option ednspacket_max '1232'
        option filter_aaaa '0'
        option filter_a '0'
config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option dhcpv4 'server'
        option dhcpv6 'server'
        option ra 'server'
        option ra_slaac '1'
        list ra_flags 'managed-config'
        list ra_flags 'other-config'
config dhcp 'wan'
        option interface 'wan'
        option ignore '1'
config odhcpd 'odhcpd'
        option maindhcp '0'
        option leasefile '/tmp/hosts/odhcpd'
        option leasetrigger '/usr/sbin/odhcpd-update'
        option loglevel '4'

root@OpenWrt:~# cat /etc/config/firewall
config defaults
        option input 'REJECT'
        option output 'ACCEPT'
        option forward 'REJECT'
        option synflood_protect '1'
        option flow_offloading '1'
        option flow_offloading_hw '1'
config zone
        option name 'lan'
        list network 'lan'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
config zone
        option name 'wan'
        list network 'wan'
        list network 'wan6'
        option input 'DROP'
        option output 'ACCEPT'
        option forward 'REJECT'
        option masq '1'
        option mtu_fix '1'
config forwarding
        option src 'lan'
        option dest 'wan'
config rule
        option name 'Allow-DHCP-Renew'
        option src 'wan'
        option proto 'udp'
        option dest_port '68'
        option target 'ACCEPT'
        option family 'ipv4'
config rule
        option name 'Allow-Ping'
        option src 'wan'
        option proto 'icmp'
        option family 'ipv4'
        option target 'DROP'
        list icmp_type 'echo-request'
config rule
        option name 'Allow-IGMP'
        option src 'wan'
        option proto 'igmp'
        option family 'ipv4'
        option target 'ACCEPT'
config rule
        option name 'Allow-DHCPv6'
        option src 'wan'
        option proto 'udp'
        option dest_port '546'
        option family 'ipv6'
        option target 'ACCEPT'
config rule
        option name 'Allow-MLD'
        option src 'wan'
        option proto 'icmp'
        option src_ip 'fe80::/10'
        list icmp_type '130/0'
        list icmp_type '131/0'
        list icmp_type '132/0'
        list icmp_type '143/0'
        option family 'ipv6'
        option target 'ACCEPT'
config rule
        option name 'Allow-ICMPv6-Input'
        option src 'wan'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        list icmp_type 'router-solicitation'
        list icmp_type 'neighbour-solicitation'
        list icmp_type 'router-advertisement'
        list icmp_type 'neighbour-advertisement'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'
config rule
        option name 'Allow-ICMPv6-Forward'
        option src 'wan'
        option dest '*'
        option proto 'icmp'
        list icmp_type 'echo-request'
        list icmp_type 'echo-reply'
        list icmp_type 'destination-unreachable'
        list icmp_type 'packet-too-big'
        list icmp_type 'time-exceeded'
        list icmp_type 'bad-header'
        list icmp_type 'unknown-header-type'
        option limit '1000/sec'
        option family 'ipv6'
        option target 'ACCEPT'
config rule
        option name 'Allow-IPSec-ESP'
        option src 'wan'
        option dest 'lan'
        option proto 'esp'
        option target 'ACCEPT'
config rule
        option name 'Allow-ISAKMP'
        option src 'wan'
        option dest 'lan'
        option dest_port '500'
        option proto 'udp'
        option target 'ACCEPT'

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the linked OpenWrt issue 17943 and the two referenced forum reports, then reproduce the 5 GHz failure on the Xiaomi Mi Router 3G using the supplied /etc/config/wireless settings. Compare behavior with OpenWrt 23 and collect crash or kernel logs; done means identifying the driver cause and verifying that 5 GHz remains stable on 24.10.

Written by the indexing model from the issue text.

Assessment

Tech stack
c, linux
Domain
embedded-iot, networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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