#20815: [netifd] Restart network, continuously printing "waiting for br-lan to
become free. Usage count = 2"
------------------------+-----------------------------------
Reporter: wendy.wu@… | Owner: developers
Type: defect | Status: new
Priority: normal | Milestone: Netifd Implementation
Component: packages | Version: Trunk
Keywords: |
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The issue can be reproduced only in IPv6 environment and br-lan get ipv6
global address.
"ifdown lan" or "/etc/init.d/network restart" or "reboot" can reproduce
the "refcount=2" issue.
But the issue can't be reproduced when first ifdown "wan" interface, then
ifdown "lan" interface.
And the issue can't be reproduced when delete "wan" route manually.
I try to track the issue, when I delete "wan" the following two route ,
the "br-lan" reference count will be released.
4084:6666:0:3be::/64 from 4084:6666:0:3be::/64 dev pppoe-wan proto static
metric 256
4084:6666:0:3be::/64 dev pppoe-wan proto static metric 256
The issue seems related to route of "wan" and "lan".
Could you please give some suggestions?
Thanks a lot.
The following is the logs when reboot system,
root@OpenWrt:~# reboot
root@OpenWrt:~# [ 8924.082000] Unexpected close, not stopping watchdog!
Watchdog was terminated due to requested system reboot.
[ 8924.415000] br-lan: port 2(eth1) entered disabled state
[ 8924.463000] device eth0 left promiscuous mode
[ 8924.476000] br-lan: port 1(eth0) entered disabled state
[ 8924.517000] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 8924.525000] device eth1 left promiscuous mode
[ 8924.538000] br-lan: port 2(eth1) entered disabled state
[ 8924.570000] ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 8924.580000] device eth2 left promiscuous mode
[ 8924.589000] br-lan: port 3(eth2) entered disabled state
[ 8924.623000] ADDRCONF(NETDEV_UP): eth2: link is not ready
[ 8924.634000] device eth3 left promiscuous mode
[ 8924.638000] br-lan: port 4(eth3) entered disabled state
[ 8924.694000] ADDRCONF(NETDEV_UP): eth3: link is not ready
[ 8934.796000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8944.876000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8954.956000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8965.010000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8975.058000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8985.105000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 8995.152000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 9005.199000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 9015.246000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 9025.293000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 9035.352000] unregister_netdevice: waiting for br-lan to become free.
Usage count = 2
[ 9043.326000] watchdog will restart system
[ 9043.329000] Kernel bug detected1:
The following is the network config in /etc/config/network,
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option default_ps '0'
config interface 'lan'
option ifname 'eth0 eth1 eth2 eth3'
option type 'bridge'
option proto 'static'
option netmask '255.255.255.0'
option ipaddr '192.168.1.254'
option ip6assign '64'
option force_link '0'
config switch 'bcmsw'
option reset '1'
option enable_vlan '0'
option qosimppauseenable '1'
config interface 'wan'
option proto 'pppoe'
option keepalive '5,10'
option pppoe_backoff '16,16'
option auto '1'
option username 'test'
option password 'test'
option ifname 'atm_8_35'
config interface 'wan6'
option ifname '@wan'
option proto 'dhcpv6'
option reqopts '12 21 22 23 24 25 31 56 64 67 82 83'
option noslaaconly '1'
The following is the route and wan6 infomation,
root@OpenWrt:~# ip -6 route
default from 4084:6666:0:3be::/64 via fe80::2a0:a50f:fc76:b50a dev pppoe-
wan proto static metric 512
default from 4084:6666:0:3bf::/64 via fe80::2a0:a50f:fc76:b50a dev pppoe-
wan proto static metric 512
4084:6666:0:3be::/64 from 4084:6666:0:3be::/64 dev pppoe-wan proto static
metric 256
4084:6666:0:3be::/64 dev pppoe-wan proto static metric 256
4084:6666:0:3bf::/64 dev br-lan proto static metric 1024
unreachable 4084:6666:0:3bf::/64 dev lo proto static metric 2147483647
error -128
fe80::/64 dev wl0 proto kernel metric 256
fe80::/64 dev br-lan proto kernel metric 256
fe80::/64 dev atm_8_35 proto kernel metric 256
fe80::/64 dev pppoe-wan proto kernel metric 256
fe80::/10 dev pppoe-wan metric 1
fe80::/10 dev pppoe-wan proto kernel metric 256
root@OpenWrt:~#
root@OpenWrt:~# ifstatus wan6
{
"up": true,
"pending": false,
"available": true,
"autostart": true,
"uptime": 83,
"l3_device": "pppoe-wan",
"proto": "dhcpv6",
"device": "pppoe-wan",
"metric": 0,
"delegation": true,
"ipv4-address": [
],
"ipv6-address": [
{
"address": "4084:6666:0:3be:2cda:3f58:2f93:99fe",
"mask": 64,
"preferred": 604745,
"valid": 2591945
}
],
"ipv6-prefix": [
{
"address": "4084:6666:0:3bf::",
"mask": 64,
"preferred": 86316,
"valid": 86316,
"class": "wan6",
"assigned": {
"lan": {
"address": "4084:6666:0:3bf::",
"mask": 64
}
}
}
],
"ipv6-prefix-assignment": [
],
"route": [
{
"target": "4084:6666:0:3be::",
"mask": 64,
"nexthop": "::",
"metric": 256,
"valid": 2591945,
"source": "::\/0"
},
{
"target": "4084:6666:0:3be::",
"mask": 64,
"nexthop": "::",
"metric": 256,
"valid": 2591945,
"source": "4084:6666:0:3be::\/64"
},
{
"target": "::",
"mask": 0,
"nexthop": "fe80::2a0:a50f:fc76:b50a",
"metric": 512,
"valid": 1745,
"source":
"4084:6666:0:3be:2cda:3f58:2f93:99fe\/64"
},
{
"target": "::",
"mask": 0,
"nexthop": "fe80::2a0:a50f:fc76:b50a",
"metric": 512,
"valid": 1745,
"source": "4084:6666:0:3bf::\/64"
}
],
"dns-server": [
"2013:a6a6:4086:1::2"
],
"dns-search": [
],
"inactive": {
"ipv4-address": [
],
"ipv6-address": [
],
"route": [
],
"dns-server": [
],
"dns-search": [
]
},
"data": {
"passthru": "001700102013a6a6408600010000000000000002"
}
}
root@OpenWrt:~#
--
Ticket URL: <https://dev.openwrt.org/ticket/20815>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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