AC87U without service issue

I have a problem with my router all services was stopped and this is the system log, I'm on 56_2.. What is the problem?

Dec 11 14:49:50 openvpn[644]: client/92.247.16.102:1599 [client] Inactivity timeout (--ping-restart), restarting
Dec 11 14:49:50 openvpn[644]: client/92.247.16.102:1599 SIGUSR1[soft,ping-restart] received, client-instance restarting
Dec 11 15:20:05 kernel: BUG: scheduling while atomic: mtdblock3/252/0x40000002
Dec 11 15:20:05 kernel: module: sr_mod bf808000 10842
Dec...

AC87U without service issue