160927 15:07:42 [ERROR] mysqld got exception 0xc0000005 ;

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: 10.1.18-MariaDB-debug

key_buffer_size=1048576

read_buffer_size=131072

max_used_connections=7

max_threads=1001

thread_count=6

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 388151 K  bytes of memory

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

Thread pointer: 0x0x7d686f59a8

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...

mysqld.exe!Field::is_null_in_record()[field.h:1035]

mysqld.exe!create_tmp_table()[sql_select.cc:16720]

mysqld.exe!JOIN::exec_inner()[sql_select.cc:2887]

mysqld.exe!JOIN::exec()[sql_select.cc:2506]

mysqld.exe!mysql_select()[sql_select.cc:3440]

mysqld.exe!handle_select()[sql_select.cc:384]

mysqld.exe!mysql_execute_command()[sql_parse.cc:3421]

mysqld.exe!Prepared_statement::execute()[sql_prepare.cc:4299]

mysqld.exe!Prepared_statement::execute_loop()[sql_prepare.cc:3931]

mysqld.exe!mysql_sql_stmt_execute()[sql_prepare.cc:3056]

mysqld.exe!mysql_execute_command()[sql_parse.cc:2973]

mysqld.exe!mysql_parse()[sql_parse.cc:7318]

mysqld.exe!dispatch_command()[sql_parse.cc:1490]

mysqld.exe!do_command()[sql_parse.cc:1108]

mysqld.exe!threadpool_process_request()[threadpool_common.cc:238]

mysqld.exe!io_completion_callback()[threadpool_win.cc:568]

KERNEL32.DLL!VirtualUnlock()

ntdll.dll!RtlGetActiveActivationContext()

ntdll.dll!RtlFreeUnicodeString()

KERNEL32.DLL!BaseThreadInitThunk()

ntdll.dll!RtlUserThreadStart()

Trying to get some variables.

Some pointers may be invalid and cause the dump to abort.

Query (0x7d68c2a158): CREATE TEMPORARY TABLE `ps` AS  SELECT DISTINCT STRAIGHT_JOIN STDDEV( `col_time_nokey` ) AS field1, DEFAULT( `col_varchar_nokey` ) AS field2, @A := `pk` AS field3 FROM `a` GROUP BY IFNULL( ( SCHEMA() ), ( RELEASE_LOCK( ( TRIM( BOTH -5614018410494033920 FROM ( `col_time_key` >> NULL ) ) ) ) ) ) WITH ROLLUP

Connection ID (thread ID): 10

Status: NOT_KILLED

E:\buildbot\rqg/runall.pl --no-mask --seed=time --threads=5 --duration=600 --queries=100M --reporters=QueryTimeout,Backtrace,ErrorLog,Deadlock,Shutdown --redefine=conf/mariadb/redefine_random_keys.yy --redefine=conf/mariadb/redefine_set_session_vars.yy --validators=TransformerNoComparator --transformers=ConvertSubqueriesToViews,DisableOptimizations,EnableOptimizations,ExecuteAsCTE,ExecuteAsInsertSelect,ExecuteAsPreparedOnce,ExecuteAsSelectItem,ExecuteAsUnion,ExecuteAsUpdateDelete,ExecuteAsView,NullIf,OrderBy,StraightJoin --grammar=conf/mariadb/functions.yy --mtr-build-thread=300 --basedir1=E:\buildbot\bbwin1\win-rqg-se\build\..\build-debug --vardir1=E:\buildbot\bbwin1\win-rqg-se\build\..\..\..\vardirs\10.1-2737\optim-crash-tests/current1_1

seed => 1474977648