[DRAFT] use-of-uninitialized-value in rec_get_status(unsigned char const*)

# 2026-07-13T01:27:29 [3976659] | SUMMARY: MemorySanitizer: use-of-uninitialized-value /test/11.4_dbg_msan/storage/innobase/include/rem0rec.h:253:2 in rec_get_status(unsigned char const*)

# 2026-07-13T01:27:29 [3976659] | ==3979671==WARNING: MemorySanitizer: use-of-uninitialized-value

# 2026-07-13T01:27:29 [3976659] |     #0 0x5555581ef024 in rec_get_status(unsigned char const*) /test/11.4_dbg_msan/storage/innobase/include/rem0rec.h:253:2

# 2026-07-13T01:27:29 [3976659] |     #1 0x5555581ef024 in rec_get_offsets_func(unsigned char const*, dict_index_t const*, unsigned short*, unsigned long, unsigned long, char const*, unsigned int, mem_block_info_t**) /test/11.4_dbg_msan/storage/innobase/rem/rem0rec.cc:842:11

# 2026-07-13T01:27:29 [3976659] |     #2 0x555557e8e7a2 in btr_search_hash_table_validate(THD*, unsigned long) /test/11.4_dbg_msan/storage/innobase/btr/btr0sea.cc:2137:14

# 2026-07-13T01:27:29 [3976659] |     #3 0x555557e8e7a2 in btr_search_validate(THD*) /test/11.4_dbg_msan/storage/innobase/btr/btr0sea.cc:2224:10

# 2026-07-13T01:27:29 [3976659] |     #4 0x555557bdd833 in ha_innobase::check(THD*, st_ha_check_opt*) /test/11.4_dbg_msan/storage/innobase/handler/ha_innodb.cc:15428:10

# 2026-07-13T01:27:29 [3976659] |     #5 0x5555566778b9 in handler::ha_check(THD*, st_ha_check_opt*) /test/11.4_dbg_msan/sql/handler.cc:5383:7

# 2026-07-13T01:27:29 [3976659] |     #6 0x55555755f6d1 in mysql_admin_table(THD*, TABLE_LIST*, st_ha_check_opt*, st_mysql_const_lex_string const*, thr_lock_type, bool, bool, unsigned int, int (*)(THD*, TABLE_LIST*, st_ha_check_opt*), int (handler::*)(THD*, st_ha_check_opt*), int (*)(THD*, TABLE_LIST*, st_ha_check_opt*), bool) /test/11.4_dbg_msan/sql/sql_admin.cc:918:21

# 2026-07-13T01:27:29 [3976659] |     #7 0x555557563995 in Sql_cmd_check_table::execute(THD*) /test/11.4_dbg_msan/sql/sql_admin.cc:1619:8

# 2026-07-13T01:27:29 [3976659] |     #8 0x5555570508d6 in mysql_execute_command(THD*, bool) /test/11.4_dbg_msan/sql/sql_parse.cc:5914:26

# 2026-07-13T01:27:29 [3976659] |     #9 0x555557044e9f in mysql_parse(THD*, char*, unsigned int, Parser_state*) /test/11.4_dbg_msan/sql/sql_parse.cc:7943:18

# 2026-07-13T01:27:29 [3976659] |     #10 0x55555703e898 in dispatch_command(enum_server_command, THD*, char*, unsigned int, bool) /test/11.4_dbg_msan/sql/sql_parse.cc:1925:7                                      # 2026-07-13T01:27:29 [3976659] |     #11 0x55555704595e in do_command(THD*, bool) /test/11.4_dbg_msan/sql/sql_parse.cc:1433:17

# 2026-07-13T01:27:29 [3976659] |     #12 0x55555752c7ec in do_handle_one_connection(CONNECT*, bool) /test/11.4_dbg_msan/sql/sql_connect.cc:1504:11

# 2026-07-13T01:27:29 [3976659] |     #13 0x55555752c186 in handle_one_connection /test/11.4_dbg_msan/sql/sql_connect.cc:1416:5

# 2026-07-13T01:27:29 [3976659] |     #14 0x7ffff709caa3 in start_thread nptl/pthread_create.c:447:8

# 2026-07-13T01:27:29 [3976659] |     #15 0x7ffff7129c6b in clone3 misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78

# 2026-07-13T01:27:29 [3976659] | 

# 2026-07-13T01:27:29 [3976659] |   Uninitialized value was stored to memory at

# 2026-07-13T01:27:29 [3976659] |     #0 0x5555581ef01d in rec_get_status(unsigned char const*) /test/11.4_dbg_msan/storage/innobase/include/rem0rec.h:252:14

# 2026-07-13T01:27:29 [3976659] |     #1 0x5555581ef01d in rec_get_offsets_func(unsigned char const*, dict_index_t const*, unsigned short*, unsigned long, unsigned long, char const*, unsigned int, mem_block_info_t**) /test/11.4_dbg_msan/storage/innobase/rem/rem0rec.cc:842:11

# 2026-07-13T01:27:29 [3976659] | 

# 2026-07-13T01:27:29 [3976659] |   Memory was marked as uninitialized

# 2026-07-13T01:27:29 [3976659] |     #0 0x55555657e581 in __msan_allocated_memory (/data/Server_bin/MSAN_MD120726-mariadb-11.4.13-linux-x86_64-dbg/bin/mariadbd+0x102a581) (BuildId: 091c4ed560cb05f6554dd4707d515631ef957662)

# 2026-07-13T01:27:29 [3976659] |     #1 0x555557e77ae6 in buf_LRU_block_remove_hashed(buf_page_t*, page_id_t, buf_pool_t::hash_chain&, bool) /test/11.4_dbg_msan/storage/innobase/buf/buf0lru.cc:1114:3

# 2026-07-13T01:27:29 [3976659] |                                                                                                                                                                                   # 2026-07-13T01:27:29 [3976659] | SUMMARY: MemorySanitizer: use-of-uninitialized-value /test/11.4_dbg_msan/storage/innobase/include/rem0rec.h:253:2 in rec_get_status(unsigned char const*)

# $RQG_HOME/rqg.pl \

# --gendata=conf/mariadb/table_stress.zz \

# --gendata_sql=conf/mariadb/table_stress.sql \

# --grammar=conf/mariadb/table_stress_innodb.yy \

# --redefine=conf/mariadb/redefine_ai_blob_offpage.yy \

# --mysqld=--loose-innodb_lock_schedule_algorithm=fcfs \

# --mysqld=--loose-idle_write_transaction_timeout=0 \                                                                                                                                                               # --mysqld=--loose-idle_transaction_timeout=0 \

# --mysqld=--loose-idle_readonly_transaction_timeout=0 \

# --mysqld=--connect_timeout=60 \

# --mysqld=--interactive_timeout=28800 \

# --mysqld=--slave_net_timeout=60 \

# --mysqld=--net_read_timeout=30 \

# --mysqld=--net_write_timeout=60 \

# --mysqld=--loose-table_lock_wait_timeout=50 \

# --mysqld=--wait_timeout=28800 \

# --no_mask \

# --queries=10000000 \

# --seed=random \

# --reporters=None \

# --reporters=ErrorLog \

# --reporters=Deadlock \

# --validators=None \

# --mysqld=--log_output=none \

# --mysqld=--log_bin_trust_function_creators=1 \

# --mysqld=--loose-debug_assert_on_not_freed_memory=0 \

# --engine=InnoDB \

# --restart_timeout=240 \

# --mysqld=--plugin-load-add=file_key_management.so \

# --mysqld=--loose-file-key-management-filename=$RQG_HOME/conf/mariadb/encryption_keys.txt \

# --mysqld=--plugin-load-add=provider_lzo.so \

# --mysqld=--plugin-load-add=provider_bzip2.so \

# --mysqld=--plugin-load-add=provider_lzma.so \

# --mysqld=--plugin-load-add=provider_snappy.so \

# --mysqld=--plugin-load-add=provider_lz4.so \

# --mysqld=--loose-innodb_compression_level=1 \

# --duration=300 \

# --mysqld=--loose-innodb_fatal_semaphore_wait_threshold=300 \

# --mysqld=--loose-innodb_data_file_path=ibdata1:1M:autoextend:autoshrink \

# --mysqld=--lock-wait-timeout=15 \

# --mysqld=--innodb-lock-wait-timeout=10 \

# --mysqld=--sql_mode=STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION \

# --mysqld=--loose-innodb_read_only_compressed=OFF \

# --mysqld=--loose-innodb-sync-debug \

# --mysqld=--innodb_stats_persistent=on \

# --mysqld=--innodb_adaptive_hash_index=on \

# --mysqld=--innodb_sort_buffer_size=65536 \

# --mysqld=--innodb_random_read_ahead=ON \

# --mysqld=--innodb_read_ahead_threshold=0 \

# --mysqld=--loose-innodb_evict_tables_on_commit_debug=on \

# --mysqld=--loose-max-statement-time=30 \

# --threads=33 \

# --rr= \

# --mysqld=--innodb_use_native_aio=1 \

# --mysqld=--innodb_undo_log_truncate=OFF \

# --mysqld=--innodb_rollback_on_timeout=ON \

# --mysqld=--innodb_page_size=64K \

# --mysqld=--innodb-buffer-pool-size=256M \

# --vardir_type=slow \

# --no_mask \

# --batch \

# --basedir1=/Server_bin/MSAN_MD120726-mariadb-11.4.13-linux-x86_64-dbg \

# --basedir2=/Server_bin/MSAN_MD120726-mariadb-11.4.13-linux-x86_64-dbg \

# --script_debug=_nix_ \

# --major_runid=1783929705 \

# --minor_runid=91