Conflict between innodb_defragment and ALTER TABLE

# 2025-09-17T17:06:46 [3345048] | mariadbd: /data/Server/10.11D/storage/innobase/handler/handler0alter.cc:11728: virtual bool ha_innobase::commit_inplace_alter_table(TABLE*, Alter_inplace_info*, bool): Assertion `ctx->new_table->get_ref_count() == 1' failed.

#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=125082942207552) at ./nptl/pthread_kill.c:44

#1  __pthread_kill_internal (signo=6, threadid=125082942207552) at ./nptl/pthread_kill.c:78

#2  __GI___pthread_kill (threadid=125082942207552, 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="ctx->new_table->get_ref_count() == 1", file="/data/Server/10.11D/storage/innobase/handler/handler0alter.cc", line=11728, 

    function=<optimized out>) at ./assert/assert.c:92

#6  __GI___assert_fail (assertion="ctx->new_table->get_ref_count() == 1", file="/data/Server/10.11D/storage/innobase/handler/handler0alter.cc", line=11728, 

    function="virtual bool ha_innobase::commit_inplace_alter_table(TABLE*, Alter_inplace_info*, bool)") at ./assert/assert.c:101

#7  ha_innobase::commit_inplace_alter_table (this=<optimized out>, altered_table=, ha_alter_info=, commit=true) at /data/Server/10.11D/storage/innobase/handler/handler0alter.cc:11728

#8  handler::ha_commit_inplace_alter_table (this=, altered_table=altered_table@entry=, ha_alter_info=ha_alter_info@entry=, commit=commit@entry=true) at /data/Server/10.11D/sql/handler.cc:5431

#9  mysql_inplace_alter_table (thd=thd@entry=, table_list=, table=table@entry=, altered_table=altered_table@entry=, ha_alter_info=ha_alter_info@entry=, target_mdl_request=target_mdl_request@entry=, ddl_log_state=, 

    trigger_param=, alter_ctx=, partial_alter=false, start_alter_id=0, if_exists=false) at /data/Server/10.11D/sql/sql_table.cc:8190

#10 mysql_alter_table (thd=thd@entry=, new_db=new_db@entry=, new_name=<optimized out>, create_info=create_info@entry=, table_list=<optimized out>, table_list@entry=, recreate_info=recreate_info@entry=, 

    alter_info=<optimized out>, order_num=<optimized out>, order=<optimized out>, ignore=<optimized out>, if_exists=<optimized out>) at /data/Server/10.11D/sql/sql_table.cc:11404

#11 Sql_cmd_alter_table::execute (this=<optimized out>, thd=) at /data/Server/10.11D/sql/sql_alter.cc:688

#12 mysql_execute_command (thd=thd@entry=, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/Server/10.11D/sql/sql_parse.cc:6165

#13 mysql_parse (thd=thd@entry=, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=) at /data/Server/10.11D/sql/sql_parse.cc:8180

#14 dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=, packet=packet@entry="ALTER TABLE `t7` ENCRYPTION_KEY_ID=2 /* E_R Thread7 QNO 11 CON_ID 22 */ ", packet_length=packet_length@entry=72, 

    blocking=blocking@entry=true) at /data/Server/10.11D/sql/sql_parse.cc:1906

#15 do_command (thd=thd@entry=, blocking=blocking@entry=true) at /data/Server/10.11D/sql/sql_parse.cc:1419

#16 do_handle_one_connection (connect=<optimized out>, connect@entry=, put_in_cache=put_in_cache@entry=true) at /data/Server/10.11D/sql/sql_connect.cc:1475

#17 handle_one_connection (arg=) at /data/Server/10.11D/sql/sql_connect.cc:1387

#18 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

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