[SR-Users] db_mysql_new_connection(): driver error: Can't connect to MySQL server

Fri Nov 25 17:09:07 CET 2022

Hello!

We use Kamailio in conjunction with the cloud Azure Database for MySQL 5.7.
It has been noticed that Kamailio does not always start after restarting.
It happens to restart a couple of times and everything starts normally.
>From the pickup trace I collect on our side, it can be seen that Kamailio
connects to MySQL, requests and gets data, and then sends a Request Quit.
On another server with a different configuration (slightly different set of
modules) and connected to the same database, this issue is not reproduced.

How to determine the source of the problem?

Below, the logs are filtered by PID of processes in which an error occurred:
ERROR: db_mysql [km_my_con.c:163]: db_mysql_new_connection(): driver error:
Can't connect to MySQL server on '10.1.128.4' (110)

11(588460) DEBUG: <core> [core/pt.c:308]: fork_process(): seeding PRNG with
893384711
11(588460) DEBUG: <core> [core/rand/cryptorand.c:36]: cryptorand_seed():
seeding cryptorand generator with 893384711
11(588460) DEBUG: <core> [core/rand/fortuna/random.c:175]:
sr_add_entropy(): additional 4 bytes entropy added to cryptographic PRNG
11(588460) DEBUG: <core> [core/pt.c:313]: fork_process(): test random
numbers 289569343 1482836098 4036842274 2495827489
11(588460) DEBUG: <core> [core/sr_module.c:926]: init_child(): initializing
PROC_RPC with rank -2
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: jsonrpcs [DMQ WORKER]
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: kex [DMQ WORKER]
11(588460) DEBUG: kex [kex_mod.c:155]: child_init(): rank is (-2)
11(588460) DEBUG: <core> [core/utils/sruid.c:121]: sruid_init(): root for
sruid is [srid-6380d27f-8faac-] (0 / 20)
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: corex [DMQ WORKER]
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: tm [DMQ WORKER]
11(588460) DEBUG: tm [callid.c:136]: child_init_callid(): callid: '
558fadb265b2cc20-588460 at 10.1.15.12'
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: tmx [DMQ WORKER]
11(588460) DEBUG: tmx [tmx_mod.c:262]: child_init(): rank is (-2)
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: sl [DMQ WORKER]
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: usrloc [DMQ WORKER]
11(588460) DEBUG: <core> [core/utils/sruid.c:121]: sruid_init(): root for
sruid is [ulcx-6380d27f-8faac-] (0 / 20)
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: registrar [DMQ WORKER]
11(588460) DEBUG: <core> [core/utils/sruid.c:121]: sruid_init(): root for
sruid is [uloc-6380d27f-8faac-] (0 / 20)
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: ctl [DMQ WORKER]
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: dmq [DMQ WORKER]
11(588460) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 11
rank -2: auth_db [DMQ WORKER]
11(588460) DEBUG: <core> [db.c:315]: db_do_init2(): connection 0x
7f96e7d58880 not found in pool
11(588460) DEBUG: db_mysql [km_my_con.c:110]: db_mysql_new_connection():
opening connection: mysql://xxxx:xxxx@10.1.128.4/kamailio
11(588460) ERROR: db_mysql [km_my_con.c:163]: db_mysql_new_connection():
driver error: Can't connect to MySQL server on '10.1.128.4' (110)
11(588460) ERROR: <core> [db.c:319]: db_do_init2(): could not add
connection to the pool
11(588460) ERROR: auth_db [auth_db_mod.c:161]: child_init(): unable to
connect to the database
11(588460) ERROR: <core> [core/sr_module.c:882]: init_mod_child(): error
while initializing module auth_db
(/usr/lib/x86_64-linux-gnu/kamailio/modules/auth_db.so) (idx: 11 rank: -2
desc: [DMQ WORKER])
11(588460) ERROR: <core> [core/pt.c:338]: fork_process(): init_child failed
for process 11, pid 588460, "DMQ WORKER"
11(588460) ERROR: dmq [dmq.c:314]: child_init(): failed to fork worker
process 0
11(588460) ERROR: <core> [core/sr_module.c:882]: init_mod_child(): error
while initializing module dmq
(/usr/lib/x86_64-linux-gnu/kamailio/modules/dmq.so) (idx: 11 rank: 0 desc:
[DMQ WORKER])
11(588460) ERROR: <core> [main.c:1842]: main_loop(): error in init_child

17(588466) DEBUG: <core> [core/pt.c:308]: fork_process(): seeding PRNG with
2018260302
17(588466) DEBUG: <core> [core/rand/cryptorand.c:36]: cryptorand_seed():
seeding cryptorand generator with 2018260302
17(588466) DEBUG: <core> [core/rand/fortuna/random.c:175]:
sr_add_entropy(): additional 4 bytes entropy added to cryptographic PRNG
17(588466) DEBUG: <core> [core/pt.c:313]: fork_process(): test random
numbers 1395463366 918020172 18663197 531231393
17(588466) DEBUG: <core> [core/sr_module.c:926]: init_child(): initializing
PROC_TIMER with rank -1
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: jsonrpcs [Dialog Clean Timer]
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: kex [Dialog Clean Timer]
17(588466) DEBUG: kex [kex_mod.c:155]: child_init(): rank is (-1)
17(588466) DEBUG: <core> [core/utils/sruid.c:121]: sruid_init(): root for
sruid is [srid-6380d27f-8fab2-] (0 / 20)
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: corex [Dialog Clean Timer]
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: tm [Dialog Clean Timer]
17(588466) DEBUG: tm [callid.c:136]: child_init_callid(): callid: '
558fadb265b2cc20-588466 at 10.1.15.12'
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: tmx [Dialog Clean Timer]
17(588466) DEBUG: tmx [tmx_mod.c:262]: child_init(): rank is (-1)
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: sl [Dialog Clean Timer]
17(588466) DEBUG: <core> [core/sr_module.c:878]: init_mod_child(): idx 17
rank -1: usrloc [Dialog Clean Timer]
17(588466) DEBUG: <core> [core/utils/sruid.c:121]: sruid_init(): root for
sruid is [ulcx-6380d27f-8fab2-] (0 / 20)
17(588466) DEBUG: <core> [db.c:315]: db_do_init2(): connection 0x
7f96e7d58880 not found in pool
17(588466) DEBUG: db_mysql [km_my_con.c:110]: db_mysql_new_connection():
opening connection: mysql://xxxx:xxxx@10.1.128.4/kamailio
17(588466) ERROR: db_mysql [km_my_con.c:163]: db_mysql_new_connection():
driver error: Can't connect to MySQL server on '10.1.128.4' (110)
17(588466) ERROR: <core> [db.c:319]: db_do_init2(): could not add
connection to the pool
17(588466) ERROR: usrloc [usrloc_mod.c:485]: child_init(): child(-1):
failed to connect to database
17(588466) ERROR: <core> [core/sr_module.c:882]: init_mod_child(): error
while initializing module usrloc
(/usr/lib/x86_64-linux-gnu/kamailio/modules/usrloc.so) (idx: 17 rank: -1
desc: [Dialog Clean Timer])
17(588466) ERROR: <core> [core/pt.c:338]: fork_process(): init_child failed
for process 17, pid 588466, "Dialog Clean Timer"
17(588466) ERROR: dialog [dialog.c:782]: child_init(): failed to start
clean timer routine as process
17(588466) ERROR: <core> [core/sr_module.c:882]: init_mod_child(): error
while initializing module dialog
(/usr/lib/x86_64-linux-gnu/kamailio/modules/dialog.so) (idx: 17 rank: 0
desc: [Dialog Clean Timer])
17(588466) ERROR: <core> [main.c:1842]: main_loop(): error in init_child
17(588466) CRITICAL: <core> [core/mem/q_malloc.c:519]: qm_free(): BUG:
freeing already freed pointer (0x7f96e2f84650), called from tls:
tls_init.c: ser_free(323), first free tls: tls_init.c: ser_free(323) -
ignoring
17(588466) CRITICAL: <core> [core/mem/q_malloc.c:519]: qm_free(): BUG:
freeing already freed pointer (0x7f96e2f84900), called from tls:
tls_init.c: ser_free(323), first free tls: tls_init.c: ser_malloc(293) -
ignoring
17(588466) CRITICAL: <core> [core/mem/q_malloc.c:519]: qm_free(): BUG:
freeing already freed pointer (0x7f96e2fd50b0), called from tls:
tls_init.c: ser_free(323), first free tls: tls_init.c: ser_free(323) -
ignoring
17(588466) CRITICAL: <core> [core/mem/q_malloc.c:519]: qm_free(): BUG:
freeing already freed pointer (0x7f96e2f820e0), called from tls:
tls_init.c: ser_free(323), first free tls: tls_init.c: ser_free(323) -
ignoring

- Debian 11.5
- libmariadb version 3.1.16
-modules: auth_db, permissions, domain, rtpengine, dispatcher, dialog,
uac, carrierroute, topos, acc
- kamailio 5.6.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC,
TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT,
USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST,
HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 10.2.1

-- 

BR,
Denys Pozniak
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