[SR-Users] Kamailio stop to process incoming SIP traffic via TCP.

[Jurijs Ivolga]

Hi,

Just to add that in my case I had a problem when after some period of time
with a lot of TLS clients(100k+) I got a lot of TCP connections in
CLOSE_WAIT state. When connections in CLOSE_WAIT state hit more then 1k,
then kamailio stopped to receive traffic via TLS, nevertheless UDP at same
time worked fine. From my point of view it looked like there was issue
somewhere on Linux side, cause Kamailio never got anything... At least this
is what I remember... I still plan to work on it someday. :) And if I will
find out, I'll let you know.

Jurijs


On Wed, Feb 27, 2019 at 1:13 PM Kristijan Vrban <vrban.lkml at gmail.com>
wrote:

> when is strace to the kamailio process that is attached to the tcp
> port. it get sporadic this:
>
> [], 46, 5000)            = 0
> epoll_wait(17, [{EPOLLIN, {u32=2692971064, u64=139924137540152}}], 46,
> 5000) = 1
> accept(14, {sa_family=AF_INET, sin_port=htons(59766),
> sin_addr=inet_addr("xxx.xx.xxx.xxx")}, [28->16]) = 275
> fcntl(275, F_GETFL)                     = 0x2 (flags O_RDWR)
> fcntl(275, F_SETFL, O_RDWR|O_NONBLOCK)  = 0
> epoll_ctl(17, EPOLL_CTL_ADD, 275, {EPOLLIN|EPOLLRDHUP,
> {u32=2692977328, u64=139924137546416}}) = 0
> epoll_wait(17, [{EPOLLIN, {u32=2692977328, u64=139924137546416}}], 47,
> 5000) = 1
> epoll_ctl(17, EPOLL_CTL_DEL, 275, 0x7ffdae44ee4c) = 0
> recvmsg(53, {msg_namelen=0}, MSG_DONTWAIT) = -1 EAGAIN (Resource
> temporarily unavailable)
> recvfrom(56, 0x7ffdae44ed90, 16, MSG_DONTWAIT, NULL, NULL) = -1 EAGAIN
> (Resource temporarily unavailable)
> sendmsg(56, {msg_name=NULL, msg_namelen=0,
> msg_iov=[{iov_base="\210ku\230B\177\0\0", iov_len=8}], msg_iovlen=1,
> msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET,
> cmsg_type=SCM_RIGHTS, cmsg_data=[275]}], msg_controllen=20,
> msg_flags=0}, 0) = 8
> epoll_wait(17,
>
> But that's all, no further processing by kamailio.
>
> Am Mi., 27. Feb. 2019 um 11:53 Uhr schrieb Kristijan Vrban
> <vrban.lkml at gmail.com>:
> >
> > Hi kamailios,
> >
> > i have a creepy situation with v5.2.1 stable Kamilio. After a day or
> > so, Kamailio stop to process incoming SIP traffic via TCP. The
> > incoming TCP network packages get TCP-ACK from the OS (Debian 9,
> > 4.18.0-15-generic-Linux) but Kamailio does not show any processing for
> > the SIP-Traffic incoming via TCP. No logs, nothing. While traffic via
> > UDP is working just totally fine.
> >
> > When i look via command "netstat -ntp" is see, that the Recv-Q get
> > bigger and bigger. e.g.:
> >
> > Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program
> > name tcp 4566 0 172.17.217.12:5060 xxx.xxx.xxx.xxx:57252 ESTABLISHED
> > 31347/kamailio
> >
> > After Kamailio restart, all is working fine again for a day. We have
> > maybe 10-20 devices online via TCP and low call volume (1-2 call per
> > minute). The only settings for tcp we have is "tcp_delayed_ack=no"
> >
> > How to could we debug this situation? Again, no error, no warings in
> > the log. Just nothing.
> >
> > Kristijan
>
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