Watchdog: reboot on unregister_netdevice to avoid offline routers

Tue Apr 10 07:06:19 2018 kern.emerg kernel: [550796.520344] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:29 2018 kern.emerg kernel: [550806.660256] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:39 2018 kern.emerg kernel: [550816.800167] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:50 2018 kern.emerg kernel: [550826.950118] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:07:00 2018 kern.emerg kernel: [550837.090048] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:07:10 2018 kern.emerg kernel: [550847.229911] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:07:20 2018 kern.emerg kernel: [550857.369822] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:07:30 2018 kern.emerg kernel: [550867.509730] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:07:40 2018 kern.emerg kernel: [550877.649644] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1

triggered by command: iw dev mesh0 del

Mem: 38940K used, 21316K free, 120K shrd, 2284K buff, 9080K cached
CPU:   0% usr   0% sys   0% nic  99% idle   0% io   0% irq   0% sirq
Load average: 9.16 9.04 8.97 1/76 28767
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
10677     2 root     SW       0   0%   0% [kworker/0:0]
 1192     1 root     S     1744   3%   0% /sbin/netifd
28719 28663 root     R     1200   2%   0% top
22384 22337 root     D     1076   2%   0% iw dev mesh0 del
28673     2 root     SW       0   0%   0% [kworker/u2:0]
25091 25086 root     S     2228   4%   0% {autoupdater-wif} /usr/bin/lua /usr/s
26472 26467 root     S     2228   4%   0% {autoupdater-wif} /usr/bin/lua /usr/s
23892 23887 root     S     2228   4%   0% {autoupdater-wif} /usr/bin/lua /usr/s
27985 27980 root     S     2228   4%   0% {autoupdater-wif} /usr/bin/lua /usr/s
22432     1 root     D     2144   4%   0% /usr/bin/respondd -d /usr/lib/respond
22546 22545 root     S     1988   3%   0% {hoodselector} /usr/bin/lua /usr/sbin
22555 22552 root     D     1892   3%   0% {geolocator} /usr/bin/lua /lib/gluon/
  941     1 root     S     1716   3%   0% /usr/sbin/haveged -w 1024 -d 32 -i 32
    1     0 root     S     1532   3%   0% /sbin/procd
 1951     1 dnsmasq  S     1488   2%   0% /usr/sbin/dnsmasq -C /var/etc/dnsmasq
22337  1192 root     S     1372   2%   0% {mac80211.sh} /bin/sh ./mac80211.sh m
 1735     1 root     S     1284   2%   0% /usr/sbin/uhttpd -f -h /lib/gluon/sta
  934     1 root     S     1252   2%   0% /sbin/logd -S 64
  485     1 root     S     1192   2%   0% /sbin/ubusd
^C124     1 root     S <   1188   2%   0% /usr/sbin/ntpd -n -N -S /usr/sbin/ntp
root@TataWilhMesh:~#

This affected following mesh cloud: https://map.ffnw.de/#/en/map/ec086ba4dd84

all affected routers are updated more or less at the same time which mean its looks like an overflow or similar.

The fastd connection died aswell with following messages:

Tue Apr 10 07:06:00 2018 kern.emerg kernel: [552003.755315] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:04 2018 daemon.info fastd[2055]: sending handshake to <mesh_vpn_backbone_peer__10000>[5.9.56.26:10000]...
Tue Apr 10 07:06:04 2018 daemon.info fastd[2055]: resolving host `ol01.sn.ffnw.de' for peer <mesh_vpn_backbone_peer__10000>...
Tue Apr 10 07:06:04 2018 daemon.info fastd[2055]: resolved host `ol01.sn.ffnw.de' successfully
Tue Apr 10 07:06:10 2018 kern.emerg kernel: [552013.895251] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:11 2018 daemon.info fastd[2055]: sending handshake to <mesh_vpn_backbone_peer__10001>[5.9.56.26:10001]...
Tue Apr 10 07:06:11 2018 daemon.info fastd[2055]: resolving host `ol02.sn.ffnw.de' for peer <mesh_vpn_backbone_peer__10001>...
Tue Apr 10 07:06:11 2018 daemon.info fastd[2055]: resolved host `ol02.sn.ffnw.de' successfully
Tue Apr 10 07:06:21 2018 kern.emerg kernel: [552024.035189] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:26 2018 daemon.info fastd[2055]: sending handshake to <mesh_vpn_backbone_peer__10000>[[2a01:4f8:161:5205:4::1]:10000]...
Tue Apr 10 07:06:31 2018 kern.emerg kernel: [552034.175120] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1
Tue Apr 10 07:06:31 2018 daemon.info fastd[2055]: sending handshake to <mesh_vpn_backbone_peer__10001>[[2a01:4f8:161:5205:4::1]:10001]...
Tue Apr 10 07:06:41 2018 kern.emerg kernel: [552044.315057] unregister_netdevice: waiting for mesh0 to become free. Usage count = 1

Following Programs let the shell dieing after call:

root@TataWilhVPN:~# iwinfo 

root@TataWilhVPN:~# iw radio0 scan
^C

root@TataWilhVPN:~# iw mesh0 scan
^C