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CREATE TABLE t (f TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP);
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INSERT INTO t VALUES (),();
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SELECT GROUP_CONCAT(DEFAULT(f)) FROM t;
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# Cleanup
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DROP TABLE t;
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10.5 dd62a285b88958dae9b9f3e49fdd0c55f6eced72
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==2848625==WARNING: MemorySanitizer: use-of-uninitialized-value
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#0 0x5589313f2d0b in Item_func_group_concat::setup(THD*) /data/bld/10.5-msan/sql/item_sum.cc:4313:47
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#1 0x5589304c2f55 in Item_sum::aggregator_setup(THD*) /data/bld/10.5-msan/sql/item_sum.h:555:57
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#2 0x5589304c2f55 in setup_sum_funcs(THD*, Item_sum**) /data/bld/10.5-msan/sql/sql_select.cc:26402:15
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#3 0x5589304c2f55 in JOIN::make_aggr_tables_info() /data/bld/10.5-msan/sql/sql_select.cc:3773:9
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#4 0x558930474ad0 in JOIN::optimize_stage2() /data/bld/10.5-msan/sql/sql_select.cc:3125:7
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#5 0x558930484422 in JOIN::optimize_inner() /data/bld/10.5-msan/sql/sql_select.cc:2409:9
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#6 0x55893046840c in JOIN::optimize() /data/bld/10.5-msan/sql/sql_select.cc:1741:10
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#7 0x55893044a5d0 in mysql_select(THD*, TABLE_LIST*, 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/bld/10.5-msan/sql/sql_select.cc:4865:19
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#8 0x5589304491c6 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/bld/10.5-msan/sql/sql_select.cc:450:10
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#9 0x5589303801ae in execute_sqlcom_select(THD*, TABLE_LIST*) /data/bld/10.5-msan/sql/sql_parse.cc:6343:12
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#10 0x55893035a35a in mysql_execute_command(THD*) /data/bld/10.5-msan/sql/sql_parse.cc:4020:12
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#11 0x558930341647 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /data/bld/10.5-msan/sql/sql_parse.cc:8121:18
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#12 0x558930334bd2 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) /data/bld/10.5-msan/sql/sql_parse.cc:1891:7
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#13 0x5589303435e8 in do_command(THD*) /data/bld/10.5-msan/sql/sql_parse.cc:1375:17
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#14 0x55893094634f in do_handle_one_connection(CONNECT*, bool) /data/bld/10.5-msan/sql/sql_connect.cc:1416:11
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#15 0x558930945a45 in handle_one_connection /data/bld/10.5-msan/sql/sql_connect.cc:1318:5
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#16 0x558931d60a5a in pfs_spawn_thread /data/bld/10.5-msan/storage/perfschema/pfs.cc:2201:3
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#17 0x7f0fd789f043 in start_thread nptl/./nptl/pthread_create.c:442:8
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#18 0x7f0fd791f61b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
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Memory was marked as uninitialized
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#0 0x55892fe2673e in __msan_allocated_memory (/mnt8t/bld/10.5-msan/sql/mariadbd+0x77e73e)
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#1 0x5589331ab976 in my_malloc /data/bld/10.5-msan/mysys/my_malloc.c:114:7
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SUMMARY: MemorySanitizer: use-of-uninitialized-value /data/bld/10.5-msan/sql/item_sum.cc:4313:47 in Item_func_group_concat::setup(THD*)
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10.4 64f44b22d9a3dab3d4c0b77addbcbdafde57b466 Valgrind
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==2848768== Thread 6:
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==2848768== Conditional jump or move depends on uninitialised value(s)
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==2848768== at 0xE1964A: Item_func_group_concat::setup(THD*) (item_sum.cc:4147)
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==2848768== by 0xE1AE46: Aggregator_simple::setup(THD*) (item_sum.h:721)
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==2848768== by 0xA37867: Item_sum::aggregator_setup(THD*) (item_sum.h:553)
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==2848768== by 0xA28F91: setup_sum_funcs(THD*, Item_sum**) (sql_select.cc:26097)
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==2848768== by 0x9E9F19: JOIN::make_aggr_tables_info() (sql_select.cc:3773)
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==2848768== by 0x9E73B5: JOIN::optimize_stage2() (sql_select.cc:3128)
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==2848768== by 0x9E4ABA: JOIN::optimize_inner() (sql_select.cc:2414)
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==2848768== by 0x9E2197: JOIN::optimize() (sql_select.cc:1731)
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==2848768== by 0x9EDD69: mysql_select(THD*, 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*) (sql_select.cc:4832)
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==2848768== by 0x9DC9FE: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:442)
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==2848768== by 0x99D1E6: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6521)
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==2848768== by 0x993533: mysql_execute_command(THD*) (sql_parse.cc:3978)
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==2848768== by 0x9A13A8: mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) (sql_parse.cc:8060)
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==2848768== by 0x98CB1F: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) (sql_parse.cc:1857)
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==2848768== by 0x98B386: do_command(THD*) (sql_parse.cc:1378)
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==2848768== by 0xB3595E: do_handle_one_connection(CONNECT*) (sql_connect.cc:1419)
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==2848768==
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Reproducible on all existing versions, with at least MyISAM, InnoDB, Aria.
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