possible netgraph regression on freebsd 10.0-RC3

[Marcelo Gondim]

Em 02/01/14 09:27, Cedric Tabary escreveu:
> Hello,
>
> I upgraded several FreeBSD servers from 9.2-STABLE to 10.0-RC3 and I
> now have strange behavior of mpd-5.7.
>
> Symptoms :
> - mpd stops accepting connections (PPTP VPN), and stops accepting control
> connectiosn also (on telnet and http).
> - The only way to kill mpd is a SIGKILL
> - after killing mpd, all ng interfaces are still up and forwarding
>    trafic
> - the only way to revert to normal operation is a server power-cycle,
> software reboot just freeze the kernel.
>
> dmesg shows a lot of :
> sonewconn: pcb 0xfffff80006f61930: Listen queue overflow: 4 already in
> queue awaiting acceptance
> however I can't find pcb 0xfffff80006f61930 in netstat and there is no
> flood, did I miss something ?
>
> netstat -naA shows pptp control connections with non null Recv-Q
> netstat -naA shows netgraph control sockets with non null Send-Q
> In normal operation conditions, all Send-Q/Recv-Q are 0 on all those
> control sockets.
>
> Attached :
> - dmesg
> - netstat -naA (anonymized)
> - lsof -n (anonymized)
>
> FreeBSD xxx 10.0-RC3 FreeBSD 10.0-RC3 #0 r259778: Mon Dec 23
> 23:27:58 UTC 2013     root at snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC
> amd64
>
> All this is reproduced once every 2-3 days on 4 different servers.
>
> Cédric
>
This really interests me. I'll follow up.

Cheers,
Gondim