SET @cmd:="SET @@SESSION.SQL_MODE=(SELECT 'a')";

SET @@SESSION.OPTIMIZER_SWITCH="materialization=OFF";

SET @@SESSION.OPTIMIZER_SWITCH="in_to_exists=OFF";

PREPARE stmt FROM @cmd;

mysqld: /data/git/10.5_dbg/sql/sql_error.cc:335: void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*): Assertion `!is_set() || (m_status == DA_OK_BULK && is_bulk_op())' failed.

Core was generated by `/data/MD180320-mariadb-10.5.2-linux-x86_64-dbg/bin/mysqld --no-defaults --core-'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

57	../sysdeps/unix/sysv/linux/pthread_kill.c: No such file or directory.

[Current thread is 1 (Thread 0x7f2b2c7c8700 (LWP 24499))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=signo@entry=6)

    at ../sysdeps/unix/sysv/linux/pthread_kill.c:57

#1  0x0000560dec9ba7d4 in my_write_core (sig=sig@entry=6)

    at /data/git/10.5_dbg/mysys/stacktrace.c:518

#2  0x0000560dec163b5f in handle_fatal_signal (sig=6) at /data/git/10.5_dbg/sql/signal_handler.cc:325

#3  <signal handler called>

#4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#5  0x00007f2b2af0c801 in __GI_abort () at abort.c:79

#6  0x00007f2b2aefc39a in __assert_fail_base (

    fmt=0x7f2b2b0837d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 

    assertion=assertion@entry=0x560decb292e0 "!is_set() || (m_status == DA_OK_BULK && is_bulk_op())", file=file@entry=0x560decb29280 "/data/git/10.5_dbg/sql/sql_error.cc", line=line@entry=335, 

    function=function@entry=0x560decb29e00 <Diagnostics_area::set_ok_status(unsigned long long, unsigned long long, char const*)::__PRETTY_FUNCTION__> "void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*)") at assert.c:92

#7  0x00007f2b2aefc412 in __GI___assert_fail (

    assertion=assertion@entry=0x560decb292e0 "!is_set() || (m_status == DA_OK_BULK && is_bulk_op())", file=file@entry=0x560decb29280 "/data/git/10.5_dbg/sql/sql_error.cc", line=line@entry=335, 

    function=function@entry=0x560decb29e00 <Diagnostics_area::set_ok_status(unsigned long long, unsigned long long, char const*)::__PRETTY_FUNCTION__> "void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*)") at assert.c:101

#8  0x0000560debe723c3 in Diagnostics_area::set_ok_status (this=0x7f2affc1ab70, 

    affected_rows=affected_rows@entry=0, last_insert_id=last_insert_id@entry=0, 

    message=message@entry=0x560decb39602 "Statement prepared")

    at /data/git/10.5_dbg/sql/sql_error.cc:335

#9  0x0000560debee19dc in my_ok (message=0x560decb39602 "Statement prepared", id=0, 

    affected_rows_arg=0, thd=0x7f2affc15088) at /data/git/10.5_dbg/sql/sql_class.h:5155

#10 mysql_sql_stmt_prepare (thd=thd@entry=0x7f2affc15088)

    at /data/git/10.5_dbg/sql/sql_prepare.cc:2887

#11 0x0000560debebc36b in mysql_execute_command (thd=thd@entry=0x7f2affc15088)

    at /data/git/10.5_dbg/sql/sql_parse.cc:3910

#12 0x0000560debec97a5 in mysql_parse (thd=thd@entry=0x7f2affc15088, rawbuf=<optimized out>, 

    length=<optimized out>, parser_state=parser_state@entry=0x7f2b2c7c7450, 

    is_com_multi=is_com_multi@entry=false, is_next_command=is_next_command@entry=false)

    at /data/git/10.5_dbg/sql/sql_parse.cc:7926

#13 0x0000560debeb5664 in dispatch_command (command=command@entry=COM_QUERY, 

    thd=thd@entry=0x7f2affc15088, packet=packet@entry=0x7f2affc67089 "PREPARE stmt FROM @cmd", 

    packet_length=packet_length@entry=22, is_com_multi=is_com_multi@entry=false, 

    is_next_command=is_next_command@entry=false) at /data/git/10.5_dbg/sql/sql_parse.cc:1839

#14 0x0000560debeb3eaf in do_command (thd=0x7f2affc15088) at /data/git/10.5_dbg/sql/sql_parse.cc:1358

#15 0x0000560dec00da09 in do_handle_one_connection (connect=<optimized out>, 

    connect@entry=0x7f2b08e2b3a8, put_in_cache=put_in_cache@entry=true)

    at /data/git/10.5_dbg/sql/sql_connect.cc:1422

#16 0x0000560dec00dd38 in handle_one_connection (arg=arg@entry=0x7f2b08e2b3a8)

    at /data/git/10.5_dbg/sql/sql_connect.cc:1319

#17 0x0000560dec46acfc in pfs_spawn_thread (arg=0x7f2b2a445888)

    at /data/git/10.5_dbg/storage/perfschema/pfs.cc:2201

#18 0x00007f2b2bbef6db in start_thread (arg=0x7f2b2c7c8700) at pthread_create.c:463

#19 0x00007f2b2afed88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95