2019-05-21 15:25:21 0x7f0dc9ab5700  InnoDB: Assertion failure in file /home/buildbot/buildbot/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX/mariadb-10.3.15/storage/innobase/row/row0merge.cc line 4509

InnoDB: Failing assertion: table->get_ref_count() == 0

InnoDB: We intentionally generate a memory trap.

InnoDB: Submit a detailed bug report to https://jira.mariadb.org/

InnoDB: If you get repeated assertion failures or crashes, even

InnoDB: immediately after the mysqld startup, there may be

InnoDB: corruption in the InnoDB tablespace. Please refer to

InnoDB: https://mariadb.com/kb/en/library/innodb-recovery-modes/

InnoDB: about forcing recovery.

190521 15:25:21 [ERROR] mysqld got signal 6 ;

This could be because you hit a bug. It is also possible that this binary

or one of the libraries it was linked against is corrupt, improperly built,

or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help

diagnose the problem, but since we have already crashed,

something is definitely wrong and this may fail.

Server version: 10.3.15-MariaDB

key_buffer_size=134217728

read_buffer_size=4194304

max_used_connections=147

max_threads=202

thread_count=150

It is possible that mysqld could use up to

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1169834 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x56033a84edf8

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0x7f0dc9ab4d30 thread_stack 0x49000

*** buffer overflow detected ***: /usr/sbin/mysqld terminated

======= Backtrace: =========

/lib64/libc.so.6(__fortify_fail+0x37)[0x7f0e86d9e9e7]

/lib64/libc.so.6(+0x115b62)[0x7f0e86d9cb62]

/lib64/libc.so.6(+0x117947)[0x7f0e86d9e947]

/usr/sbin/mysqld(my_addr_resolve+0xda)[0x56032e82d47a]

/usr/sbin/mysqld(my_print_stacktrace+0x1c2)[0x56032e816ab2]

/usr/sbin/mysqld(handle_fatal_signal+0x30f)[0x56032e2b353f]

/lib64/libpthread.so.0(+0xf5d0)[0x7f0e889e95d0]

/lib64/libc.so.6(gsignal+0x37)[0x7f0e86cbd207]

/lib64/libc.so.6(abort+0x148)[0x7f0e86cbe8f8]

/usr/sbin/mysqld(+0x4c5e9c)[0x56032dffae9c]

/usr/sbin/mysqld(+0x9d9d7f)[0x56032e50ed7f]

/usr/sbin/mysqld(+0x939f47)[0x56032e46ef47]

/usr/sbin/mysqld(_Z17mysql_alter_tableP3THDPK25st_mysql_const_lex_stringS3_P14HA_CREATE_INFOP10TABLE_LISTP10Alter_infojP8st_orderb+0x2ab0)[0x56032e16b180]

/usr/sbin/mysqld(_Z20mysql_recreate_tableP3THDP10TABLE_LISTb+0x191)[0x56032e16c821]

/usr/sbin/mysqld(+0x68e6c1)[0x56032e1c36c1]

/usr/sbin/mysqld(_ZN22Sql_cmd_optimize_table7executeEP3THD+0xdb)[0x56032e1c470b]

/usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x3a04)[0x56032e0de404]

/usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x22b)[0x56032e0e3bdb]

/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1d3e)[0x56032e0e68de]

/usr/sbin/mysqld(_Z10do_commandP3THD+0x13e)[0x56032e0e773e]

/usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x1aa)[0x56032e1b879a]

/usr/sbin/mysqld(handle_one_connection+0x3d)[0x56032e1b88bd]

/lib64/libpthread.so.0(+0x7dd5)[0x7f0e889e1dd5]

/lib64/libc.so.6(clone+0x6d)[0x7f0e86d84ead]

Today After upgrade mariadb 5.5 to mariadb 10.3.15 in openvz container.

I ran mysqlcheck -A -o  and  after checking 10 seconds mariadb crashed with log (mariadb-host003.log)

And on another host is the same. 

mysql.column_stats                                 Table is already up to date

mysql.columns_priv                                 OK

mysql.db                                           OK

mysql.event                                        OK

mysql.func                                         OK

mysql.gtid_slave_pos

note     : Table does not support optimize, doing recreate + analyze instead

status   : OK

mysql.help_category                                Table is already up to date

mysql.help_keyword                                 Table is already up to date

mysql.help_relation                                Table is already up to date

mysql.help_topic                                   Table is already up to date

mysql.host                                         OK

mysql.index_stats                                  Table is already up to date

mysqlcheck: Got error: 2013: Lost connection to MySQL server during query when executing 'OPTIMIZE TABLE ... '