[sr-dev] Kamailio stucks at __read_nocancel during stop.

[Andrey Deykunov]

Hi,

We're getting periodically core dumps when stopping Kamailio:


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Reading symbols from /var/lib/ums/sbin/kamailio...done.
[New LWP 9832]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/var/lib/ums/sbin/kamailio -m 2048 -M 12 -P
/var/run/kamailio/kamailio.pid -f /'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f79c24e842a in __GI_abort () at abort.c:89
#2  0x000000000043f92a in sig_alarm_abort (signo=14) at main.c:679
#3  <signal handler called>
#4  0x00007f79c258f910 in __read_nocancel () at
../sysdeps/unix/syscall-template.S:84
#5  0x00007f793cbd7421 in vio_read_buff () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#6  0x00007f793cbd8aa0 in my_real_read () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#7  0x00007f793cbd87d6 in my_net_read () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#8  0x00007f793cbd085d in cli_safe_read () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#9  0x00007f793cbd539a in cli_read_query_result () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#10 0x00007f793cbd436d in mysql_real_query () from
/var/lib/ums/lib/mysql/libmysqlclient.so.16
#11 0x00007f793ce80c13 in db_mysql_submit_query (_h=0x7f79c1786890,
_s=0x7f793f379250 <sql_str>) at km_dbase.c:111
#12 0x00007f793f16baba in db_do_submit_query (_h=0x7f79c1786890,
_query=0x7f793f379250 <sql_str>, submit_query=0x7f793ce801a0
<db_mysql_submit_query>) at db_query.c:58
#13 0x00007f793f16e114 in db_do_delete (_h=0x7f79c1786890,
_k=0x7ffeb3ca8df8, _o=0x0, _v=0x7ffeb3ca8dd0, _n=1, val2str=0x7f793cea8990
<db_mysql_val2str>, submit_query=0x7f793ce801a0 <db_mysql_submit_query>) at
db_query.c:300
#14 0x00007f793ce86c17 in db_mysql_delete (_h=0x7f79c1786890,
_k=0x7ffeb3ca8df8, _o=0x0, _v=0x7ffeb3ca8dd0, _n=1) at km_dbase.c:510
#15 0x00007f793f3cb841 in db_delete_ucontact_ruid (_c=0x7f794186b3c0) at
ucontact.c:1552
#16 0x00007f793f3cd096 in db_delete_ucontact (_c=0x7f794186b3c0) at
ucontact.c:1570
#17 0x00007f793f3ad0c0 in wb_timer (_r=0x7f79411d7330) at urecord.c:401
#18 0x00007f793f3ab451 in timer_urecord (_r=0x7f79411d7330) at urecord.c:463
#19 0x00007f793f3978aa in mem_timer_udomain (_d=0x7f7940d9baa0, istart=0,
istep=1) at udomain.c:1224
#20 0x00007f793f3d4608 in synchronize_all_udomains (istart=0, istep=1) at
dlist.c:756
#21 0x00007f793f3a2768 in destroy () at usrloc_mod.c:464
#22 0x0000000000637e2c in destroy_modules () at core/sr_module.c:746
#23 0x000000000041c4d8 in cleanup (show_status=1) at main.c:555
#24 0x0000000000423af7 in shutdown_children (sig=15, show_status=1) at
main.c:696
#25 0x000000000041f081 in handle_sigs () at main.c:727
#26 0x0000000000432a01 in main_loop () at main.c:1806
#27 0x000000000043df6f in main (argc=9, argv=0x7ffeb3cac348) at main.c:2802



Looks like libmysql stucks at __read_nocancel() syscall. The exit_timeout
parameter is set by default (60  sec), Kamailio version 5.3.1.

Any ideas?

Thanks,
Andrey
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