[sr-dev] mysql_ping in db_mysql_submit_query

[Juha Heinanen]

I build libmariadbclient18 with symbols (below) and got a new backtrace
of the hanging process.

I guess the only choice is to try with the newer lib that comes with
Debian Buster or give up use of db_cluster module with MySQL.

-- Juha

---start 24717 -----------------------------------------------------
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f517466d8a0 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
84	../sysdeps/unix/syscall-template.S: No such file or directory.
#0  0x00007f517466d8a0 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
No locals.
#1  0x00007f51725f3ef1 in poll (__timeout=2000, __nfds=1, __fds=0x7ffed132f808) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
No locals.
#2  vio_io_wait (vio=vio at entry=0x560529eb39d8, event=event at entry=VIO_IO_EVENT_READ, timeout=2000) at ./vio/viosocket.c:992
        ret = <optimized out>
        revents = <optimized out>
        pfd = {fd = 18, events = 3, revents = 0}
        state = {m_flags = 3509778656, m_socket = 0x7ffed132f820, m_thread = 0x0, m_number_of_bytes = 21474836512, m_timer_start = 140732408199414, m_timer = 0x7ffed132f8fc, m_operation = 3509778680, m_src_file = 0x7ffed132f8fc "\376\177", m_src_line = 16, m_wait = 0x7f517398d010}
#3  0x00007f51725f3f78 in vio_socket_io_wait (vio=vio at entry=0x560529eb39d8, event=event at entry=VIO_IO_EVENT_READ) at ./vio/viosocket.c:108
        timeout = <optimized out>
        ret = -516
#4  0x00007f51725f4082 in vio_read (vio=vio at entry=0x560529eb39d8, buf=0x560529eb3bd8 "\001", size=size at entry=16384) at ./vio/viosocket.c:184
        error = <optimized out>
        ret = <optimized out>
        flags = 64
#5  0x00007f51725f4145 in vio_read_buff (vio=0x560529eb39d8, buf=0x560529eb7be8 "\001", size=4) at ./vio/viosocket.c:232
        rc = <optimized out>
#6  0x00007f51725cfe91 in my_real_read (net=0x7f5173d674e0, complen=complen at entry=0x7ffed132f9f8, header=0 '\000') at ./sql/net_serv.cc:877
        pos = 0x560529eb7be8 "\001"
        length = <optimized out>
        i = <optimized out>
        retry_count = <optimized out>
        len = <optimized out>
        expect_error_packet = <optimized out>
        alarmed = 0 '\000'
        remain = 4
#7  0x00007f51725d0d1c in my_net_read_packet (net=net at entry=0x7f5173d674e0, read_from_server=read_from_server at entry=0 '\000') at ./sql/net_serv.cc:1140
        len = <optimized out>
        complen = 0
#8  0x00007f51725c28af in cli_safe_read (mysql=mysql at entry=0x7f5173d674e0) at ./sql-common/client.c:587
        net = 0x7f5173d674e0
        len = <optimized out>
#9  0x00007f51725c8323 in cli_advanced_command (mysql=0x7f5173d674e0, command=<optimized out>, header=0x0, header_length=0, arg=0x0, arg_length=0, skip_check=0 '\000', stmt=0x0) at ./sql-common/client.c:729
        net = 0x7f5173d674e0
        result = 0 '\000'
        stmt_skip = <optimized out>
#10 0x00007f51725be2a1 in mysql_ping (mysql=<optimized out>) at ./libmysql/libmysql.c:982
        res = <optimized out>
#11 0x00007f5172bb14e6 in db_mysql_submit_query (_h=0x7f51739ecff0, _s=0x7f5172fff2d0 <sql_str>) at km_dbase.c:83
        t = 1568791290
        i = 0
        code = 22021
        __func__ = "db_mysql_submit_query"
#12 0x00007f5172deeb88 in db_do_submit_query (_h=0x7f51739ecff0, _query=0x7f5172fff2d0 <sql_str>, submit_query=0x7f5172bb1149 <db_mysql_submit_query>) at db_query.c:58
        ret = 32593
        tvb = {tv_sec = 94580176772804, tv_usec = 139987808866288}
        tve = {tv_sec = 109108585221, tv_usec = 1365799600152}
        tz = {tz_minuteswest = 24, tz_dsttime = 65147}
        tdiff = 1755212864
        __func__ = "db_do_submit_query"
#13 0x00007f5172df11ca in db_do_insert_cmd (_h=0x7f51739ecff0, _k=0x7f51689e6960 <db_keys>, _v=0x7f51689e6c40 <db_vals>, _n=24, val2str=0x7f5172baf7b8 <db_mysql_val2str>, submit_query=0x7f5172bb1149 <db_mysql_submit_query>, mode=0) at db_query.c:242
        off = 707
        ret = 318
        __func__ = "db_do_insert_cmd"
...