AddressSanitizer: memcpy-param-overlap in my_strnxfrm_8bit_bin

CREATE TABLE t1 (a INT, b DATE);

INSERT INTO t1 VALUES (2, '2012-07-20'),(3, '2031-07-20');

SELECT GROUP_CONCAT('foo') AS f FROM t1 GROUP BY BINARY ( SUBSTR( b FROM a ) );

# Cleanup

DROP TABLE t1;

==11266==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x61500002e7d1,0x61500002e7da) and [0x61500002e7d2, 0x61500002e7db) overlap

    #0 0x7fcca66c891f (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x2e91f)

    #1 0x559a4f6427a9 in my_strnxfrm_8bit_bin /data/src/10.1/strings/ctype-bin.c:422

    #2 0x559a4e7c120a in make_sortkey /data/src/10.1/sql/filesort.cc:1055

    #3 0x559a4e7c5b4f in find_all_keys /data/src/10.1/sql/filesort.cc:840

    #4 0x559a4e7c5b4f in filesort(THD*, TABLE*, st_sort_field*, unsigned int, SQL_SELECT*, unsigned long long, bool, unsigned long long*, unsigned long long*, Filesort_tracker*) /data/src/10.1/sql/filesort.cc:301

    #5 0x559a4e3a9d35 in create_sort_index /data/src/10.1/sql/sql_select.cc:21677

    #6 0x559a4e3d06f8 in JOIN::exec_inner() /data/src/10.1/sql/sql_select.cc:3245

    #7 0x559a4e3d1e54 in JOIN::exec() /data/src/10.1/sql/sql_select.cc:2562

    #8 0x559a4e3c66a7 in mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /data/src/10.1/sql/sql_select.cc:3499

    #9 0x559a4e3c6e95 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.1/sql/sql_select.cc:388

    #10 0x559a4e296077 in execute_sqlcom_select /data/src/10.1/sql/sql_parse.cc:5950

    #11 0x559a4e2b0287 in mysql_execute_command(THD*) /data/src/10.1/sql/sql_parse.cc:2995

    #12 0x559a4e2c8498 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.1/sql/sql_parse.cc:7468

    #13 0x559a4e2cf27c in dispatch_command(enum_server_command, THD*, char*, unsigned int) /data/src/10.1/sql/sql_parse.cc:1496

    #14 0x559a4e2d5a08 in do_command(THD*) /data/src/10.1/sql/sql_parse.cc:1124

    #15 0x559a4e57dedd in do_handle_one_connection(THD*) /data/src/10.1/sql/sql_connect.cc:1330

    #16 0x559a4e57e3ee in handle_one_connection /data/src/10.1/sql/sql_connect.cc:1242

    #17 0x559a4ee4dd26 in pfs_spawn_thread /data/src/10.1/storage/perfschema/pfs.cc:1861

    #18 0x7fcca6484493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

    #19 0x7fcca483d93e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)

0x61500002e7d1 is located 209 bytes inside of 452-byte region [0x61500002e700,0x61500002e8c4)

allocated by thread T6 here:

    #0 0x7fcca66ee73f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)

    #1 0x559a4f61a484 in sf_malloc /data/src/10.1/mysys/safemalloc.c:115

    #2 0x559a4f712eda (/data/bld/10.1-asan/bin/mysqld+0x1d9feda)

Thread T6 created by T0 here:

    #0 0x7fcca66bdbba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)

    #1 0x559a4ee5957d in spawn_thread_v1 /data/src/10.1/storage/perfschema/pfs.cc:1911

0x61500002e7d2 is located 210 bytes inside of 452-byte region [0x61500002e700,0x61500002e8c4)

allocated by thread T6 here:

    #0 0x7fcca66ee73f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)

    #1 0x559a4f61a484 in sf_malloc /data/src/10.1/mysys/safemalloc.c:115

    #2 0x559a4f712eda (/data/bld/10.1-asan/bin/mysqld+0x1d9feda)

SUMMARY: AddressSanitizer: memcpy-param-overlap ??:0 ??

==11266==ABORTING