Table `cool_down`.`t3` contains unrecognizable instant ALTER metadata

# 2026-03-30T00:04:31 [2732040] | mariadbd: /data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc:2520: dict_table_t* dict_load_table_one(mtr_t&, const st_::span<const char>&, dict_err_ignore_t, dict_names_t&): Assertion `!table || (ignore_err & ~DICT_ERR_IGNORE_FK_NOKEY) || !table->is_readable() || !table->corrupted' failed.

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44

#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78

#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89

#3  __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26

#4  __GI_abort () at ./stdlib/abort.c:79

#5  __assert_fail_base (fmt="%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry="!table || (ignore_err & ~DICT_ERR_IGNORE_FK_NOKEY) || !table->is_readable() || !table->corrupted", 

    file=file@entry="/data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc", line=line@entry=2520, 

    function=function@entry="dict_table_t* dict_load_table_one(mtr_t&, const st_::span<const char>&, dict_err_ignore_t, dict_names_t&)") at ./assert/assert.c:94

#6  __assert_fail (assertion="!table || (ignore_err & ~DICT_ERR_IGNORE_FK_NOKEY) || !table->is_readable() || !table->corrupted", file="/data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc", line=2520, 

    function="dict_table_t* dict_load_table_one(mtr_t&, const st_::span<const char>&, dict_err_ignore_t, dict_names_t&)") at ./assert/assert.c:103

#7  dict_load_table_one (mtr=..., name=..., ignore_err=ignore_err@entry=DICT_ERR_IGNORE_FK_NOKEY, fk_tables=std::__debug::deque with 0 elements) at /data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc:2520

#8  dict_sys_t::load_table (this=<dict_sys>, name=..., ignore=ignore@entry=DICT_ERR_IGNORE_FK_NOKEY) at /data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc:2556

#9  dict_load_table_on_id (table_id=table_id@entry=39, ignore_err=ignore_err@entry=DICT_ERR_IGNORE_FK_NOKEY) at /data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc:2629

#10 trx_purge_table_open (table_id=39, mdl_context=mdl_context@entry=, mdl=mdl@entry=) at /data/Server/MDEV-37949D/storage/innobase/trx/trx0purge.cc:1145

#11 trx_purge_attach_undo_recs (trx=trx@entry=, n_work_items=n_work_items@entry=) at /data/Server/MDEV-37949D/storage/innobase/trx/trx0purge.cc:1247

#12 trx_purge (trx=trx@entry=, n_tasks=<optimized out>, n_tasks@entry=4, history_size=152) at /data/Server/MDEV-37949D/storage/innobase/trx/trx0purge.cc:1360

#13 purge_coordinator_state::do_purge (this=this@entry=<purge_state>, trx=trx@entry=) at /data/Server/MDEV-37949D/storage/innobase/srv/srv0srv.cc:1431

#14 purge_coordinator_callback () at /data/Server/MDEV-37949D/storage/innobase/srv/srv0srv.cc:1525

#15 tpool::task_group::execute (this=<purge_coordinator_task_group>, t=t@entry=<purge_coordinator_task>) at /data/Server/MDEV-37949D/tpool/task_group.cc:70

#16 tpool::task::execute (this=<purge_coordinator_task>) at /data/Server/MDEV-37949D/tpool/task.cc:32

#17 tpool::thread_pool_generic::worker_main (this=, thread_var=) at /data/Server/MDEV-37949D/tpool/tpool_generic.cc:568

#18 std::__invoke_impl<void, void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> (__f=<optimized out>, __t=<optimized out>)

    at /usr/include/c++/13/bits/invoke.h:74

#19 std::__invoke<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> (__fn=<optimized out>) at /usr/include/c++/13/bits/invoke.h:90

#20 std::thread::_Invoker<std::tuple<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> >::_M_invoke<0ul, 1ul, 2ul> (this=<optimized out>)

    at /usr/include/c++/13/bits/std_thread.h:292

#21 std::thread::_Invoker<std::tuple<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> >::operator() (this=<optimized out>)

    at /usr/include/c++/13/bits/std_thread.h:299

#22 std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (tpool::thread_pool_generic::*)(tpool::worker_data*), tpool::thread_pool_generic*, tpool::worker_data*> > >::_M_run (this=<optimized out>)

    at /usr/include/c++/13/bits/std_thread.h:244

#23 ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6

#24 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447

#25 clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:100

(rr) frame 7

#7  dict_load_table_one (mtr=..., name=..., ignore_err=ignore_err@entry=DICT_ERR_IGNORE_FK_NOKEY, fk_tables=std::__debug::deque with 0 elements) at /data/Server/MDEV-37949D/storage/innobase/dict/dict0load.cc:2520

2520            ut_ad(!table

(rr) info args

mtr = {m_start = true, m_commit = true, m_freeing_tree = false, m_last = , m_last_offset = 0, m_log_mode = 0, m_modifications = 0, m_made_dirty = 0, m_latch_ex = 0, m_trim_pages = 0, m_crc = 0, trx = , 

  m_user_space = , m_user_space_id = 0, m_memo = {<small_vector_base> = {BeginX = , Size = 0, Capacity = 16}, small = {{object = , type = MTR_MEMO_PAGE_SX_FIX}, {object = , type = MTR_MEMO_PAGE_S_FIX}, {

        object = , type = MTR_MEMO_PAGE_S_FIX}, {object = , type = 2779096485} <repeats 13 times>}}, m_log = {m_heap = , m_list = {sentinel_ = {next = , prev = }}, m_first_block = {<ilist_node<void>> = {next = , 

        prev = }, m_buf_end = 0, m_magic_n = 375767, 

      m_data = "\260\347\224\374eZ\000\000P.\0008\tE\000\000\000\000\000\000\000\000\000\000\001", '\000' <repeats 15 times>, "\260\347\224\374eZ\000\000@\345\224\374eZ\000\000\001\000\000\000\000\000\000\000A\001

\000\000\000\000\000\000\022\000\000\000\000\000\000\000\361\035?\372eZ\000\000\254\343\224\374eZ\000\000\211+$\372eZ\000\000\300\032f\373eZ\000\000\350\352\224\374", '\000' <repeats 12 times>, "\022\000\000\000\0

00\000\000\000\320\346\224\374eZ\000\000\340\346\224\374eZ\000\000ƾ\0008\tE\000\000\352L\244\372eZ\000\000\260\347\224\374eZ\000\000\330\346\224\374eZ\000\000mysql", '\000' <repeats 19 times>..., m_used = 0}}, 

  m_commit_lsn = 0, m_freed_space = , m_freed_pages = }

name = {data_ = "cool_down/t3\024\b", size_ = 12}

ignore_err = DICT_ERR_IGNORE_FK_NOKEY

fk_tables = std::__debug::deque with 0 elements

(rr) info locals

pcur = {btr_cur = {page_cur = {index = , rec = "cool_down/t3", offsets = , block = }, flag = BTR_CUR_BINARY, tree_height = 1, up_match = 1, up_bytes = 0, low_match = 0, low_bytes = 11, n_fields = 0, n_bytes = 0, 

    fold = 0, rtr_info = }, latch_mode = BTR_SEARCH_LEAF, old_rec = , old_n_core_fields = 0, old_n_fields = 0, rel_pos = 0, old_page_id = {m_id = 0}, modify_clock = 0, pos_state = BTR_PCUR_IS_POSITIONED, 

  search_mode = PAGE_CUR_GE, trx_if_known = , old_rec_buf = , buf_size = 0}

__PRETTY_FUNCTION__ = "dict_table_t* dict_load_table_one(mtr_t&, const st_::span<const char>&, dict_err_ignore_t, dict_names_t&)"

sys_index = <optimized out>

dfield = {data = , ext = 0, spatial_status = 0, len = 12, type = {prtype = 0, mtype = 4, len = 654, mbminlen = 0, mbmaxlen = 0}}

tuple = {info_bits = 0, n_fields = 1, n_fields_cmp = 1, fields = , n_v_fields = 0, v_fields = , magic_n = 65478679}

uncommitted = <optimized out>

err = DB_CORRUPTION

rec = <optimized out>

table = 

use_uncommitted = <optimized out>

heap = 

index_load_err = <optimized out>

# $RQG_HOME/rqg.pl \

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

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

# --grammar=conf/mariadb/table_stress_innodb_nocopy1.yy \

# --reporters=MariabackupIncremental_linux \

# --mysqld=--loose-innodb-log-file-size=300M \

# --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 \

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

# --mysqld=--lock-wait-timeout=86400 \

# --mysqld=--innodb-lock-wait-timeout=50 \

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

# --mysqld=--innodb_file_per_table=1 \

# --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_random_read_ahead=OFF \

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

# --threads=6 \

# --rr=Extended \

# --rr_options=--chaos --wait \

# --mysqld=--innodb_undo_log_truncate=OFF \

# --mysqld=--innodb_undo_tablespaces=16 \

# --mysqld=--innodb_rollback_on_timeout=OFF \

# --mysqld=--innodb_page_size=32K \

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

# --vardir_type=fast \

# --no_mask \

# --batch \

# --basedir1=/Server_bin/MDEV-37949D_debug_Og \

# --basedir2=/Server_bin/MDEV-37949D_debug_Og \

# --script_debug=_nix_ \

# --major_runid=1774850766 \

# --minor_runid=104

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