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

[Daniel-Constantin Mierla]

Can you get file written by `kamctl trap`? It should have the backtrace
for all kamailio processes. You need latest kamailio 5.2.

Also, get the output for: kamctl ps

Cheers,
Daniel

On 14.03.19 13:52, Kristijan Vrban wrote:
> When i attach via gdb to one of the tcp worker, i see this:
>
> (gdb) bt
> #0  0x00007fdaf4d14470 in futex_wait (private=<optimized out>,
> expected=1, futex_word=0x7fdaeca92f8c) at
> ../sysdeps/unix/sysv/linux/futex-internal.h:61
> #1  futex_wait_simple (private=<optimized out>, expected=1,
> futex_word=0x7fdaeca92f8c) at ../sysdeps/nptl/futex-internal.h:135
> #2  __pthread_rwlock_wrlock_slow (rwlock=0x7fdaeca92f80) at
> pthread_rwlock_wrlock.c:67
> #3  0x00007fdaf0912ee9 in CRYPTO_THREAD_write_lock () from
> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
> #4  0x00007fdaf08e1c08 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
> #5  0x00007fdaf08a6f69 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
> #6  0x00007fdaf08b36c7 in EVP_CIPHER_CTX_ctrl () from
> /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
> #7  0x00007fdaf0c31144 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
> #8  0x00007fdaf0c2bddb in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
> #9  0x00007fdaf0c22858 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
> #10 0x00007fdaf0c1af61 in SSL_do_handshake () from
> /usr/lib/x86_64-linux-gnu/libssl.so.1.1
> #11 0x00007fdaf0e8d31b in tls_accept (c=0x7fdaed26fa98,
> error=0x7ffffe2a2df0) at tls_server.c:422
> #12 0x00007fdaf0e96a1b in tls_read_f (c=0x7fdaed26fa98,
> flags=0x7ffffe2c318c) at tls_server.c:1116
> #13 0x0000556ead5e7c46 in tcp_read_headers (c=0x7fdaed26fa98,
> read_flags=0x7ffffe2c318c) at core/tcp_read.c:469
> #14 0x0000556ead5ef9cb in tcp_read_req (con=0x7fdaed26fa98,
> bytes_read=0x7ffffe2c3184, read_flags=0x7ffffe2c318c) at
> core/tcp_read.c:1496
> #15 0x0000556ead5f575f in handle_io (fm=0x7fdaf597aa98, events=1,
> idx=-1) at core/tcp_read.c:1862
> #16 0x0000556ead5e2053 in io_wait_loop_epoll (h=0x556eadaaeec0 <io_w>,
> t=2, repeat=0) at core/io_wait.h:1065
> #17 0x0000556ead5f6b35 in tcp_receive_loop (unix_sock=49) at
> core/tcp_read.c:1974
> #18 0x0000556ead4c8e24 in tcp_init_children () at core/tcp_main.c:4853
> #19 0x0000556ead3c352a in main_loop () at main.c:1735
> #20 0x0000556ead3ca5f8 in main (argc=13, argv=0x7ffffe2c3828) at main.c:2675
>
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> Am Do., 14. März 2019 um 13:41 Uhr schrieb Kristijan Vrban
> <vrban.lkml at gmail.com>:
>> Hi, with full debug is see this in log for every incoming TCP SIP request:
>>
>> Mar 14 12:10:15 kamailio-preview /usr/sbin/kamailio[17940]: DEBUG:
>> <core> [core/tcp_main.c:3871]: send2child(): WARNING: no free tcp
>> receiver, connection passed to the least busy one (105)
>> Mar 14 12:10:15 kamailio-preview /usr/sbin/kamailio[17940]: DEBUG:
>> <core> [core/tcp_main.c:3875]: send2child(): selected tcp worker 2
>> 27(17937) for activity on [tls:172.17.217.10:5061], 0x7fdaeda8f928
>>
>> So the Kamailio TCP process is working, and received TCP traffic. But
>> the tcp workers are somehow busy.
>>
>> When i attach via strace to the TCP worker, i do not see any activity. Just:
>>
>> futex(0x7fdaeca92f8c, FUTEX_WAIT_PRIVATE, 1, NULL
>>
>> and nothing, even when i see the main tcp process choose this worker process.
>>
>> Kristijan
>>
>> Am Mi., 27. Feb. 2019 um 15:14 Uhr schrieb Kristijan Vrban
>> <vrban.lkml at gmail.com>:
>>> first of all thanks for the feedback. i prepared our system now to run
>>> with debug=3
>>> I hope to see more then then.
>>>
>>> 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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-- 
Daniel-Constantin Mierla -- www.asipto.com
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