unit.conc_misc fails with LeakSanitizer errors in mysql_store_result

perl  ./mtr unit.conc_misc

...

unit.conc_misc                           [ fail ]

...

==3087871==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 144 byte(s) in 1 object(s) allocated from:

    #0 0x7f2c88ae9dc6 in calloc (/lib/x86_64-linux-gnu/libasan.so.5+0x10ddc6)

    #1 0x555a427d2053 in mysql_store_result /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2516

    #2 0x555a427baaea in test_conc49 /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:847

    #3 0x555a427b5463 in run_tests /data/src/10.6-bug/libmariadb/unittest/libmariadb/my_test.h:678

    #4 0x555a427bf3a7 in main /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:1663

    #5 0x7f2c883120b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)

Indirect leak of 8168 byte(s) in 1 object(s) allocated from:

    #0 0x7f2c88ae9bc8 in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)

    #1 0x555a427e5d2a in ma_alloc_root /data/src/10.6-bug/libmariadb/libmariadb/ma_alloc.c:90

    #2 0x555a427c3d5f in unpack_fields /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:869

    #3 0x555a427d1385 in mthd_my_read_query_result /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2429

    #4 0x555a427d1da1 in mysql_real_query /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2494

    #5 0x555a427ce8c0 in mysql_query /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2136

    #6 0x555a427baa89 in test_conc49 /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:845

    #7 0x555a427b5463 in run_tests /data/src/10.6-bug/libmariadb/unittest/libmariadb/my_test.h:678

    #8 0x555a427bf3a7 in main /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:1663

    #9 0x7f2c883120b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)

Indirect leak of 8168 byte(s) in 1 object(s) allocated from:

    #0 0x7f2c88ae9bc8 in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0x10dbc8)

    #1 0x555a427e5d2a in ma_alloc_root /data/src/10.6-bug/libmariadb/libmariadb/ma_alloc.c:90

    #2 0x555a427c4dd2 in mthd_my_read_rows /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:973

    #3 0x555a427d2323 in mysql_store_result /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2524

    #4 0x555a427baaea in test_conc49 /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:847

    #5 0x555a427b5463 in run_tests /data/src/10.6-bug/libmariadb/unittest/libmariadb/my_test.h:678

    #6 0x555a427bf3a7 in main /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:1663

    #7 0x7f2c883120b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)

Indirect leak of 96 byte(s) in 1 object(s) allocated from:

    #0 0x7f2c88ae9dc6 in calloc (/lib/x86_64-linux-gnu/libasan.so.5+0x10ddc6)

    #1 0x555a427c4af9 in mthd_my_read_rows /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:959

    #2 0x555a427d2323 in mysql_store_result /data/src/10.6-bug/libmariadb/libmariadb/mariadb_lib.c:2524

    #3 0x555a427baaea in test_conc49 /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:847

    #4 0x555a427b5463 in run_tests /data/src/10.6-bug/libmariadb/unittest/libmariadb/my_test.h:678

    #5 0x555a427bf3a7 in main /data/src/10.6-bug/libmariadb/unittest/libmariadb/misc.c:1663

    #6 0x7f2c883120b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)

SUMMARY: AddressSanitizer: 16576 byte(s) leaked in 4 allocation(s).

Bail out! Signal 6 thrown