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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