CREATE TABLE t (f INT);

INSERT INTO t VALUES (1),(2);

ALTER TABLE t ADD vcol INT GENERATED ALWAYS AS (@var := f), ALGORITHM=COPY;

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

SET @var = '8+ symbols';

SELECT COUNT(*) FROM t;

--connection default

SELECT * FROM t;

# Cleanup

DROP TABLE t;

--disconnect con1

Warning:   16 bytes freed by T@3, allocated by T@5 at mysys/my_malloc.c:155, sql/item_func.cc:4813, sql/item_func.cc:4858, sql/item_func.cc:5114, sql/set_var.cc:902, sql/set_var.cc:740, sql/sql_parse.cc:5045, sql/sql_parse.cc:8008

2023-05-19 22:11:40 0 [Note] /mnt8t/bld/10.4-debug/bin/mysqld (initiated by: unknown): Normal shutdown

mysqld: /data/src/10.4/sql/mysqld.cc:3801: void my_malloc_size_cb_func(long long int, my_bool): Assertion `(longlong) thd->status_var.local_memory_used >= 0 || !debug_assert_on_not_freed_memory' failed.

mysqld: /data/src/10.4/sql/sql_class.cc:1723: virtual THD::~THD(): Assertion `status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory' failed.

230519 22:11:40 [ERROR] mysqld got signal 6 ;

#5  0x00007f90a6f74df2 in __GI___assert_fail (assertion=0x556e086014a0 "status_var.local_memory_used == 0 || !debug_assert_on_not_freed_memory", file=0x556e08600f38 "/data/src/10.4/sql/sql_class.cc", line=1723, function=0x556e08601446 "virtual THD::~THD()") at ./assert/assert.c:101

#6  0x0000556e07706ac9 in THD::~THD (this=0x7f9084000da0, __in_chrg=<optimized out>) at /data/src/10.4/sql/sql_class.cc:1723

#7  0x0000556e07706d08 in THD::~THD (this=0x7f9084000da0, __in_chrg=<optimized out>) at /data/src/10.4/sql/sql_class.cc:1729

#8  0x0000556e07631e0c in one_thread_per_connection_end (thd=0x7f9084000da0, put_in_cache=true) at /data/src/10.4/sql/mysqld.cc:2785

#9  0x0000556e0791c19f in do_handle_one_connection (connect=0x556e0ac1bfa0) at /data/src/10.4/sql/sql_connect.cc:1431

#10 0x0000556e0791be88 in handle_one_connection (arg=0x556e0ac1bfa0) at /data/src/10.4/sql/sql_connect.cc:1324

#11 0x0000556e07e6de48 in pfs_spawn_thread (arg=0x556e0ab643b0) at /data/src/10.4/storage/perfschema/pfs.cc:1869

#12 0x00007f90a6fc8fd4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#13 0x00007f90a70495bc in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81