(gdb) bt

#0  my_read (Filedes=11, 

    Buffer=0x7f275a7f8e20 "Limit", ' ' <repeats 21 times>, "Soft Limit", ' ' <repeats 11 times>, "Hard Limit", ' ' <repeats 11 times>, "Units     \nMax cpu time", ' ' <repeats 14 times>, "unlimited", ' ' <repeats 12 times>, "unlimited", ' ' <repeats 12 times>, "seconds   \nMax file size", ' ' <repeats 13 times>, "unlimited       "..., Count=4096, MyFlags=<optimized out>)

    at /usr/src/debug/MariaDB-10.4.11/src_0/mysys/my_read.c:63

#1  0x000055a31a0aa13d in output_core_info () at /usr/src/debug/MariaDB-10.4.11/src_0/sql/signal_handler.cc:66

#2  0x000055a31a0aa530 in handle_fatal_signal (sig=11) at /usr/src/debug/MariaDB-10.4.11/src_0/sql/signal_handler.cc:339

#3  0x00007f276edfc5f0 in funlockfile () from /lib64/libpthread.so.0

#4  0x0000000000000000 in ?? ()

(gdb) bt full

#0  my_read (Filedes=11, 

    Buffer=0x7f275a7f8e20 "Limit", ' ' <repeats 21 times>, "Soft Limit", ' ' <repeats 11 times>, "Hard Limit", ' ' <repeats 11 times>, "Units     \nMax cpu time", ' ' <repeats 14 times>, "unlimited", ' ' <repeats 12 times>, "unlimited", ' ' <repeats 12 times>, "seconds   \nMax file size", ' ' <repeats 13 times>, "unlimited       "..., Count=4096, MyFlags=<optimized out>)

    at /usr/src/debug/MariaDB-10.4.11/src_0/mysys/my_read.c:63

        got_errno = <optimized out>

        readbytes = 1323

        save_count = 0

#1  0x000055a31a0aa13d in output_core_info () at /usr/src/debug/MariaDB-10.4.11/src_0/sql/signal_handler.cc:66

        buff = "Limit", ' ' <repeats 21 times>, "Soft Limit", ' ' <repeats 11 times>, "Hard Limit", ' ' <repeats 11 times>, "Units     \nMax cpu time", ' ' <repeats 14 times>, "unlimited", ' ' <repeats 12 times>, "unlimited", ' ' <repeats 12 times>, "seconds   \nMax file size", ' ' <repeats 13 times>, "unlimited", ' ' <repeats 12 times>...

        len = <optimized out>

        fd = 11

#2  0x000055a31a0aa530 in handle_fatal_signal (sig=11) at /usr/src/debug/MariaDB-10.4.11/src_0/sql/signal_handler.cc:339

        curr_time = 1580201858

        tm = {tm_sec = 38, tm_min = 57, tm_hour = 9, tm_mday = 28, tm_mon = 0, tm_year = 120, tm_wday = 2, tm_yday = 27, tm_isdst = 0, tm_gmtoff = 3600, tm_zone = 0x55a31d0121a0 "CET"}

        print_invalid_query_pointer = false

#3  0x00007f276edfc5f0 in funlockfile () from /lib64/libpthread.so.0

No symbol table info available.

#4  0x0000000000000000 in ?? ()

No symbol table info available.

(gdb) info threads

  Id   Target Id         Frame 

  8    Thread 0x7f275affc700 (LWP -1) (Exiting) PC register is not available

(gdb) p thread_list 

$3 = {{m_key = 0x55a31b072520 <key_worker_thread>, m_name = 0x55a31a7f2c14 "worker_thread", m_flags = 0}, {m_key = 0x55a31b072518 <key_timer_thread>, m_name = 0x55a31a7e8ac5 "timer_thread", 

    m_flags = 1}}

(gdb) p thread_list[0]

$4 = {m_key = 0x55a31b072520 <key_worker_thread>, m_name = 0x55a31a7f2c14 "worker_thread", m_flags = 0}

(gdb) p thread_list[1]

$5 = {m_key = 0x55a31b072518 <key_timer_thread>, m_name = 0x55a31a7e8ac5 "timer_thread", m_flags = 1}