Server crash in online alter upon concurrent ALTER and DML on table with vector field

--source include/have_debug_sync.inc

CREATE TABLE t (pk INT PRIMARY KEY, v VECTOR(1), b BLOB DEFAULT '1');

INSERT INTO t (pk, v) VALUES (1,0x30303030);

--connect (con1,localhost,root,,)

set debug_sync= 'alter_table_online_progress SIGNAL there WAIT_FOR go';

--send

  ALTER TABLE t MODIFY COLUMN b INT, ALGORITHM=COPY;

--connection default

set debug_sync= 'now WAIT_FOR there';

INSERT INTO t (pk, v) VALUES (2,0x31313131);

set debug_sync= 'now SIGNAL go';

--connection con1

--reap

# Cleanup

DROP TABLE t;

--disconnect con1

mariadbd: /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/rpl_record.cc:469: int unpack_row(const rpl_group_info*, TABLE*, uint, const uchar*, const MY_BITMAP*, const uchar**, ulong*, const uchar*): Assertion `result' failed.

241018 20:36:24 [ERROR] mysqld got signal 6 ;

#10 0x00007fddf2253e32 in __GI___assert_fail (assertion=0x558421b8ba95 "result", file=0x558421da5628 "/data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/rpl_record.cc", line=469, function=0x558421da5808 "int unpack_row(const rpl_group_info*, TABLE*, uint, const uchar*, const MY_BITMAP*, const uchar**, ulong*, const uchar*)") at ./assert/assert.c:101

#11 0x0000558420b7c1ca in unpack_row (rgi=rgi@entry=0x7fdde56ef6e0, table=0x7fddd401d878, colcnt=3, row_data=0x7fddd4024058 "\370\002", cols=cols@entry=0x7fddd40135e0, current_row_end=current_row_end@entry=0x7fddd4013698, master_reclength=0x7fddd4013628, row_end=0x7fddd4024065 "\245\245\245u") at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/rpl_record.cc:469

#12 0x0000558420b73400 in Rows_log_event::unpack_current_row (this=this@entry=0x7fddd4013578, rgi=rgi@entry=0x7fdde56ef6e0) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/log_event.h:4927

#13 0x0000558420b4f64e in Rows_log_event::write_row (this=this@entry=0x7fddd4013578, rgi=rgi@entry=0x7fdde56ef6e0, overwrite=overwrite@entry=false) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/log_event_server.cc:6758

#14 0x0000558420b51f3c in Write_rows_log_event::do_exec_row (this=0x7fddd4013578, rgi=0x7fdde56ef6e0) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/log_event_server.cc:7089

#15 0x0000558420b45229 in Rows_log_event::do_apply_event (this=0x7fddd4013578, rgi=0x7fdde56ef6e0) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/log_event_server.cc:5176

#16 0x0000558420afa47f in Log_event::apply_event (this=this@entry=0x7fddd4013578, rgi=rgi@entry=0x7fdde56ef6e0) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/log_event.cc:3946

#17 0x000055841fa850f7 in online_alter_read_from_binlog (thd=thd@entry=0x7fddd4000d58, rgi=rgi@entry=0x7fdde56ef6e0, log=log@entry=0x7fddd4025930, found_rows=found_rows@entry=0x7fdde56f3d90) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_table.cc:12123

#18 0x000055841fadbc57 in copy_data_between_tables (thd=thd@entry=0x7fddd4000d58, from=from@entry=0x7fddd003dd38, to=to@entry=0x7fddd401d878, ignore=<optimized out>, order_num=order_num@entry=0, order=order@entry=0x0, copied=<optimized out>, deleted=<optimized out>, alter_info=<optimized out>, alter_ctx=<optimized out>, online=true, start_alter_id=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_table.cc:12631

#19 0x000055841fae4573 in mysql_alter_table (thd=thd@entry=0x7fddd4000d58, new_db=new_db@entry=0x7fddd4005b28, new_name=new_name@entry=0x7fddd4005f88, create_info=create_info@entry=0x7fdde56f6b60, table_list=<optimized out>, table_list@entry=0x7fddd40159a0, recreate_info=recreate_info@entry=0x7fdde56f69b0, alter_info=<optimized out>, order_num=<optimized out>, order=<optimized out>, ignore=<optimized out>, if_exists=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_table.cc:11574

#20 0x000055841fccc54a in Sql_cmd_alter_table::execute (this=<optimized out>, thd=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_alter.cc:701

#21 0x000055841f7a35a0 in mysql_execute_command (thd=thd@entry=0x7fddd4000d58, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_parse.cc:5846

#22 0x000055841f7a6828 in mysql_parse (thd=thd@entry=0x7fddd4000d58, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x7fdde56f7440) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_parse.cc:7873

#23 0x000055841f7ad1fc in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x7fddd4000d58, packet=packet@entry=0x7fddd400b3c9 "", packet_length=packet_length@entry=49, blocking=blocking@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_parse.cc:1892

#24 0x000055841f7b59ed in do_command (thd=0x7fddd4000d58, blocking=blocking@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_parse.cc:1405

#25 0x000055841fcb0960 in do_handle_one_connection (connect=<optimized out>, connect@entry=0x558426ac73a8, put_in_cache=put_in_cache@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_connect.cc:1448

#26 0x000055841fcb1816 in handle_one_connection (arg=0x558426ac73a8) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/sql/sql_connect.cc:1350

#27 0x0000558420e7f093 in pfs_spawn_thread (arg=0x558426a96c28) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-ubsan/storage/perfschema/pfs.cc:2198

#28 0x00007fddf22a8044 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#29 0x00007fddf232861c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

#2  <signal handler called>

#3  __memcpy_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:339

#4  0x000055aa3e58f50e in Field::unpack (this=0x6190000e0dc8, to=0x6190000e259c "\200", from=0x0, from_end=0x61100008b0e4 '\276' <repeats 20 times>, param_data=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/field.cc:2183

#5  0x000055aa3eb22054 in unpack_field (tabledef=tabledef@entry=0x7f2c88a312b0, f=0x6190000e0dc8, st=st@entry=0x7f2c88a2e490, field_idx=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/rpl_record.cc:254

#6  0x000055aa3eb22ada in unpack_row (rgi=rgi@entry=0x7f2c88a30400, table=<optimized out>, colcnt=<optimized out>, row_data=<optimized out>, cols=cols@entry=0x61300004c480, current_row_end=current_row_end@entry=0x61300004c538, master_reclength=<optimized out>, row_end=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/rpl_record.cc:468

#7  0x000055aa3eb12ba8 in Rows_log_event::unpack_current_row (rgi=0x7f2c88a30400, this=0x61300004c418) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/log_event.h:4927

#8  Rows_log_event::write_row (this=this@entry=0x61300004c418, rgi=rgi@entry=0x7f2c88a30400, overwrite=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/log_event_server.cc:6758

#9  0x000055aa3eb1489a in Write_rows_log_event::do_exec_row (this=0x61300004c418, rgi=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/log_event_server.cc:7089

#10 0x000055aa3eaefc3e in Rows_log_event::do_apply_event (this=0x61300004c418, rgi=0x7f2c88a30400) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/log_event_server.cc:5176

#11 0x000055aa3ead4ea9 in Log_event::apply_event (this=this@entry=0x61300004c418, rgi=rgi@entry=0x7f2c88a30400) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/log_event.cc:3946

#12 0x000055aa3e00bf32 in online_alter_read_from_binlog (thd=thd@entry=0x62b0001ce218, rgi=rgi@entry=0x7f2c88a30400, log=log@entry=0x61b000031080, found_rows=found_rows@entry=0x7f2c88a2f0d0) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_table.cc:12123

#13 0x000055aa3e068f75 in copy_data_between_tables (thd=thd@entry=0x62b0001ce218, from=from@entry=0x6190000e2998, to=to@entry=0x6190000ece98, ignore=ignore@entry=false, order_num=order_num@entry=0, order=order@entry=0x0, copied=<optimized out>, deleted=<optimized out>, alter_info=<optimized out>, alter_ctx=<optimized out>, online=true, start_alter_id=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_table.cc:12631

#14 0x000055aa3e077f3b in mysql_alter_table (thd=thd@entry=0x62b0001ce218, new_db=new_db@entry=0x62b0001d2e20, new_name=new_name@entry=0x62b0001d3280, create_info=create_info@entry=0x7f2c88a38530, table_list=<optimized out>, table_list@entry=0x6290001f9488, recreate_info=<optimized out>, alter_info=<optimized out>, order_num=<optimized out>, order=<optimized out>, ignore=<optimized out>, if_exists=<optimized out>) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_table.cc:11574

#15 0x000055aa3e1eae59 in Sql_cmd_alter_table::execute (this=<optimized out>, thd=0x62b0001ce218) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_alter.cc:701

#16 0x000055aa3dd8dcc9 in mysql_execute_command (thd=thd@entry=0x62b0001ce218, is_called_from_prepared_stmt=is_called_from_prepared_stmt@entry=false) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_parse.cc:5846

#17 0x000055aa3dd9c092 in mysql_parse (thd=thd@entry=0x62b0001ce218, rawbuf=<optimized out>, length=<optimized out>, parser_state=parser_state@entry=0x7f2c88a3a840) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_parse.cc:7873

#18 0x000055aa3dda438f in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x62b0001ce218, packet=packet@entry=0x6290001ef219 "", packet_length=packet_length@entry=128, blocking=blocking@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_parse.cc:1892

#19 0x000055aa3dda9599 in do_command (thd=0x62b0001ce218, blocking=blocking@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_parse.cc:1405

#20 0x000055aa3e1d769f in do_handle_one_connection (connect=<optimized out>, connect@entry=0x608000003b38, put_in_cache=put_in_cache@entry=true) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_connect.cc:1448

#21 0x000055aa3e1d7fad in handle_one_connection (arg=arg@entry=0x608000003b38) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/sql/sql_connect.cc:1350

#22 0x000055aa3edfcb68 in pfs_spawn_thread (arg=0x617000007b18) at /data/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel-asan/storage/perfschema/pfs.cc:2198

#23 0x00007f2cb38a8044 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#24 0x00007f2cb392861c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81