190810 23:02:38 [ERROR] mysqld got signal 11 ;
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: 10.2.26-MariaDB-1:10.2.26+maria~bionic
key_buffer_size=134217728
read_buffer_size=2097152
max_used_connections=1
max_threads=102
thread_count=7
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 759914 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f7fbc000c08
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 = 0x7f802c512dd8 thread_stack 0x49000
addr2line: 'mysqld': No such file
mysqld(my_print_stacktrace+0x2e)[0x560a2f0d6a0e]
mysqld(handle_fatal_signal+0x513)[0x560a2eb52553]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f8032c88890]
/lib/x86_64-linux-gnu/libc.so.6(__libc_malloc+0x197)[0x7f80321f5207]
addr2line: 'mysqld': No such file
mysqld(my_malloc+0x36)[0x560a2f0d25d6]
mysqld(my_strdup+0x27)[0x560a2f0d28a7]
mysqld(my_register_filename+0xbc)[0x560a2f0d2eac]
mysqld(my_open+0x67)[0x560a2f0d3057]
mysqld(+0xb3fbce)[0x560a2f02fbce]
mysqld(+0xb41cd7)[0x560a2f031cd7]
mysqld(+0xb18366)[0x560a2f008366]
mysqld(_ZN7handler7ha_openEP5TABLEPKcij+0x33)[0x560a2eb56ab3]
mysqld(_Z21open_table_from_shareP3THDP11TABLE_SHAREPKcjjjP5TABLEb+0x8ec)[0x560a2ea60dac]
mysqld(_Z10open_tableP3THDP10TABLE_LISTP18Open_table_context+0xa8e)[0x560a2e96a3ae]
mysqld(_Z11open_tablesP3THDRK14DDL_options_stPP10TABLE_LISTPjjP19Prelocking_strategy+0xb73)[0x560a2e96d193]
mysqld(_Z20open_and_lock_tablesP3THDRK14DDL_options_stP10TABLE_LISTbjP19Prelocking_strategy+0x33)[0x560a2e96daa3]
mysqld(_Z27open_system_tables_for_readP3THDP10TABLE_LISTP18Open_tables_backup+0xa1)[0x560a2e972081]
mysqld(_Z24open_proc_table_for_readP3THDP18Open_tables_backup+0xa5)[0x560a2ec61c65]
mysqld(+0x773728)[0x560a2ec63728]
mysqld(_Z16sp_cache_routineP3THD21stored_procedure_typeP7sp_namebPP7sp_head+0xb9)[0x560a2ec63c89]
mysqld(_Z16sp_cache_routineP3THDP19Sroutine_hash_entrybPP7sp_head+0x67)[0x560a2ec63f07]
mysqld(_Z11open_tablesP3THDRK14DDL_options_stPP10TABLE_LISTPjjP19Prelocking_strategy+0xca0)[0x560a2e96d2c0]
mysqld(_Z20open_and_lock_tablesP3THDRK14DDL_options_stP10TABLE_LISTbjP19Prelocking_strategy+0x33)[0x560a2e96daa3]
mysqld(+0x4ba06d)[0x560a2e9aa06d]
mysqld(_Z21mysql_execute_commandP3THD+0x60c0)[0x560a2e9b6b50]
mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x2d2)[0x560a2e9b8ea2]
mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1f65)[0x560a2e9bbc65]
mysqld(_Z10do_commandP3THD+0x180)[0x560a2e9bc890]
mysqld(_Z24do_handle_one_connectionP7CONNECT+0x32e)[0x560a2ea86f8e]
mysqld(handle_one_connection+0x3d)[0x560a2ea8705d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76db)[0x7f8032c7d6db]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x3f)[0x7f803227f88f]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f7fbc0112b0): SELECT * FROM (  SELECT datetime as `datetime`, ta_previous(round(ta_rsi(close,14), 2),40) AS F1, ta_previous(close,40), ta_max(high,40), ta_min(low,40) FROM (   SELECT * FROM EURUSD_86400   WHERE datetime >= '0001-01-01' AND datetime <= '9999-12-31'   ORDER BY datetime DESC   LIMIT 5000 ) AS R ORDER BY datetime ASC  ) AS LIMIT_ROWS  WHERE F1 > 75 ORDER BY datetime DESC LIMIT 20
Connection ID (thread ID): 9
Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=off,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
Writing a core file...
Working directory at /var/lib/mysql