netifd segfault and sometimes eats all cpu

[cz <chengzhicn@…>]

I'm running BARRIER BREAKER (14.07, r42258) x86 on vmware.
Sometimes netifd eats all cpu, and web interface becomes unusable, 'top' shows netifd take 100% cpu, 'reboot' command takes no effect until netifd been killed.

Today I also encountered segfault, here is kernel log

[   11.581373] br-lan: port 1(eth0) entered forwarding state
[   12.428512] br-lan: port 2(wlanap) entered forwarding state
[   24.958430] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target to attach helpers instead.
[32741.085403] netifd[2052]: segfault at 10 ip 080509a3 sp bff78c40 error 4 in netifd[8048000+1b000]
[32746.163564] device wlanap left promiscuous mode
[32746.164313] br-lan: port 2(wlanap) entered disabled state
[32746.559308] br-lan: port 1(eth0) entered disabled state

[anonymous]

You'll need to provide to the developers either the corresponding netifd core file(s) or gdb backtraces of those core files.

A (sanitized) copy of your /etc/config/network would also help.

[anonymous]

Please copy the segfault core files somewhere onto your build system and issue the following command in your buildroot:

./scripts/remote-gdb /path/corefile build_dir/target-i386_i486_uClibc-0.9.33.2/netifd-2014-08-13/netifd

In the resulting gdb shell type "bt" and "bt full" and send (attach file) the resulting stacktraces.

[cz <chengzhicn@…>]

stack trace

[cz <chengzhicn@…>]

stack trace

[anonymous]

A (sanitized) copy of your /etc/config/network would also help.

[cz <chengzhicn@…>]

/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 interface 'lan'
        option ifname 'eth0'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.0.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'guest'
        option type 'bridge'
        option proto 'static'
        option ipaddr '192.168.93.1'
        option netmask '255.255.255.0'

config interface 'wan'
        option ifname 'eth1'
        option 'proto' 'pppoe'
        option 'username' 'xxxxxxx'
        option 'password' 'xxxxxxx'

config 'interface' 'office'
        option 'proto' 'pptp'
        option 'server' 'office.example.com'
        option 'username' 'xxxxxxx'
        option 'password' 'xxxxxxx'
        option 'defaultroute' '0'
        option 'mtu' '1404'
        option 'auto' '1'

config 'interface' 'vpn'
        option 'proto' 'pptp'
        option 'server' 'vpn.example.com'
        option 'username' 'xxxxxxx'
        option 'password' 'xxxxxxx'
        option 'defaultroute' '0'
        option 'auto' '1'

config 'interface' 'vpn2'
        option 'proto' 'pptp'
        option 'server' 'vpn2.example.com'
        option 'username' 'xxxxxxx'
        option 'password' 'xxxxxxx'
        option 'defaultroute' '0'
        option 'mtu' '1404'
        option 'auto' '0'

config interface 'wan6'
       option ifname '@wan'
       option proto 'dhcpv6'

config globals 'globals'
        option ula_prefix 'fd5a:9273:657f::/48'

/etc/config/wireless

config wifi-device  radio0
        option type     mac80211
        option channel  11
        option hwmode   11g
        option path     'pci0000:00/0000:00:11.0/0000:02:04.0/usb1/1-1/1-1:1.0'
        #option htmode  HT20
        # REMOVE THIS LINE TO ENABLE WIFI:
        option disabled 0

config wifi-iface
        option device   radio0
        option ifname   wlanap
        option network  lan
        option mode     ap
        option ssid     "OpenWrt"
        option encryption psk2
        option pairwise CCMP
        option wmm      0
        option wpa_group_rekey 3600
        option key      "xxxxxx"

[nbd]

please test r42347

[cz <chengzhicn@…>]

thanks, r42347 fixed this issue.

[anonymous]

thanks, r42347 fixed this issue.

[cz <chengzhicn@…>]

Today I encountered another segfault, kernel log:

[195758.204256] usb 1-1: restart device (4)
[195759.364545] usb 1-1: device restarted successfully.
[195759.365417] ieee80211 phy0: Hardware restart was requested
[234166.999918] netifd[2046]: segfault at 8 ip b7763124 sp bffc7d30 error 6 in libubox.so[b7761000+8000]
[234172.093790] device wlanap left promiscuous mode
[234172.094549] br-lan: port 2(wlanap) entered disabled state
[234172.504148] br-lan: port 1(eth0) entered disabled state
[234172.505184] device eth0 left promiscuous mode
[234172.709525] br-lan: port 1(eth0) entered disabled state

[nbd]

can you reproduce this? what are the conditions that trigger it?