190829 20:54:49 [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: 10.1.25-MariaDB
key_buffer_size=268435456
read_buffer_size=1048576
max_used_connections=1
max_threads=100002
thread_count=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 207122510 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x7f235e3c7008
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 = 0x7f23723e1288 thread_stack 0x48400
/opt/mariadb/bin/mysqld(my_print_stacktrace+0x2e)[0xc0e97e]
/opt/mariadb/bin/mysqld(handle_fatal_signal+0x4bf)[0x76a89f]
/lib64/libpthread.so.0(+0xf370)[0x7f23720be370]
/lib64/libc.so.6(gsignal+0x37)[0x7f2370ed31d7]
/lib64/libc.so.6(abort+0x148)[0x7f2370ed48c8]
/opt/mariadb/bin/mysqld[0x902070]
/opt/mariadb/bin/mysqld[0xa99427]
/opt/mariadb/bin/mysqld[0xa5bb2d]
/opt/mariadb/bin/mysqld[0xa5d1bb]
/opt/mariadb/bin/mysqld[0xa43609]
/opt/mariadb/bin/mysqld[0xa2263a]
/opt/mariadb/bin/mysqld[0xa28fb8]
/opt/mariadb/bin/mysqld[0xa29704]
/opt/mariadb/bin/mysqld[0x907e11]
/opt/mariadb/bin/mysqld(_ZN7handler27multi_range_read_info_constEjP15st_range_seq_ifPvjPjS3_P13Cost_estimate+0x91)[0x6d3471]
/opt/mariadb/bin/mysqld(_ZN10DsMrr_impl16dsmrr_info_constEjP15st_range_seq_ifPvjPjS3_P13Cost_estimate+0x54)[0x6d4814]
/opt/mariadb/bin/mysqld[0x876fcf]
/opt/mariadb/bin/mysqld[0x87ae7a]
/opt/mariadb/bin/mysqld(_ZN10SQL_SELECT17test_quick_selectEP3THD6BitmapILj64EEyybbb+0x78c)[0x8905ec]
/opt/mariadb/bin/mysqld[0x604b3b]
/opt/mariadb/bin/mysqld(_ZN4JOIN14optimize_innerEv+0x8ad)[0x605acd]
/opt/mariadb/bin/mysqld(_ZN4JOIN14optimize_innerEv+0x11f)[0x60533f]
/opt/mariadb/bin/mysqld(_Z12mysql_selectP3THDPPP4ItemP10TABLE_LISTjR4ListIS1_ES2_jP8st_orderSB_S2_SB_yP13select_resultP18st_select_lex_unitP13st_select_lex+0x246)[0x608e56]
/opt/mariadb/bin/mysqld(_Z19mysql_explain_unionP3THDP18st_select_lex_unitP13select_result+0x123)[0x609813]
/opt/mariadb/bin/mysqld[0x5af59c]
/opt/mariadb/bin/mysqld(_Z21mysql_execute_commandP3THD+0x14b4)[0x5b3eb4]
/opt/mariadb/bin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_state+0x34e)[0x5bc08e]
/opt/mariadb/bin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x239b)[0x5bf32b]
/opt/mariadb/bin/mysqld(_Z10do_commandP3THD+0x157)[0x5bf5e7]
/opt/mariadb/bin/mysqld(_Z24do_handle_one_connectionP3THD+0x183)[0x691283]
/opt/mariadb/bin/mysqld(handle_one_connection+0x42)[0x691492]
/lib64/libpthread.so.0(+0x7dc5)[0x7f23720b6dc5]
/lib64/libc.so.6(clone+0x6d)[0x7f2370f9576d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7f22ab825020): is an invalid pointer
Connection ID (thread ID): 3
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=on,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=off

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.

We think the query pointer is invalid, but we will try to print it anyway.
Query: explain SELECT
TT1.totalCallCnt
, func_SEC_TO_TIME(TT1.avgDurTm) AS avgDurTm
, TT2.maxOccupiedCount
, TT2.avgOccupiedCount
FROM (
SELECT
COUNT(callHst.call_id) AS totalCallCnt
, func_IFNULL(ROUND(AVG(callHst.call_dur_tm),0),0) AS avgDurTm
FROM call_hst callHst
WHERE callHst.stt_ymd = '20190829'
) TT1,
(
SELECT
cnnc_ymd
, MAX(chnllHst.all_chnnl_cnt) AS realTotalPorts
, MAX(chnllHst.usg_chnnl_cnt) AS maxOccupiedCount
, MIN(chnllHst.usg_chnnl_cnt) AS minOccupiedCount
, ROUND(AVG(chnllHst.usg_chnnl_cnt),0) AS avgOccupiedCount
, ROUND(AVG(chnllHst.call_occp_rt),0) AS avgBusyRate
FROM chnll_usage_hst chnllHst
WHERE chnllHst.cnnc_ymd = '20190829'
AND chnllHst.sys_id = 'ALL'
GROUP BY chnllHst.cnnc_ymd
) TT2

190829 20:54:50 mysqld_safe Number of processes running now: 0
190829 20:54:50 mysqld_safe mysqld restarted