[OpenSIPS-Users] ERROR:core:io_watch_del: BUG - trying to del fd 38 with flags 2 1

[Bogdan-Andrei Iancu]

Hi Rahul,

These are great news - that you finda way to reproduce it. Let me do it 
and start debugging.

I really do appreciate your effort in dealing with this error.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 24.07.2015 00:19, Gupta, Rahul wrote:
>
> Hi Bogdan,
>
> Almost a month ago, I have raised the issue regarding the opensips log 
> file filling up with the following message
>
> ERROR:core:io_watch_del: BUG - trying to del fd 38 with flags 2 1
>
> Now I can reproduce it every time with the following scenario:
>
> 1)UAC and UAS are connected to opensips proxy with TCP transport
>
> 2)Connections looks good
>
> 3)Netstat shows the connection to UAC in ESTABLISHED state and the 
> tcp_conn_lists of opensips also looks fine for that UAC
>
> 4)Now unplug the Ethernet cable on UAC
>
> 5)After tcp connection timeout (set to 5 mins in opensips.cfg), the 
> tcp connection goes away from netstat as well as from tcp_conn_lists
>
> 6)UAS tries another tcp call to the UAC which is still unplugged
>
> 7)tcp_conn_lists shows the tcp connection to the UAC and netstat shows 
> the connection in SYN_SENT state
>
> 8)After the tcp connection timeout (set to 5 mins in opensips.cfg), 
> the connection goes away from netstat however it remains there in 
> tcp_conn_lists and at that moment the “BUG - trying to del fd 38 with 
> flags 2 1” starts printing in infinite loop.
>
> I looked at the source code and observed the following
>
> 1)When the network cable is plugged in
>
> The io_watch_add happens with flag IO_WATCH_READ in tcp_main.c  when 
> the command is CONN_NEW
>
> 2)When the network cable is unplugged
>
> The io_watch_add happens with flag IO_WATCH_WRITE in tcp_main.c  when 
> the command is ASYNC_CONNECT
>
> 3)While doing io_watch_del after timeout, from handle_tcpconn_ev 
> method, io_watch_del always uses IO_WATCH_READ to delete the fd, which 
> gives this error in case of unplugged cable.
>
> Please look into this and suggest how can I fix this issue ?
>
> Thanks
>
> Rahul Gupta
>
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