vcol circular references lead to stack overflow

--source include/have_partition.inc

CREATE TABLE t (a INT, c INT AS (a));

ALTER TABLE t ALTER COLUMN c DROP DEFAULT;

ALTER TABLE t MODIFY COLUMN a INT AS (c) STORED;

ALTER TABLE t PARTITION BY HASH(c);

# Cleanup

DROP TABLE t;

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x000055d860a18f04 in Item::walk (this=0x0, processor=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>, walk_subquery=false, arg=0x0) at /src/sql/item.h:1702

Thread 1 (Thread 0x7fe92df012c0 (LWP 3948203)):

#0  0x000055d860a18f04 in Item::walk (this=0x0, processor=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>, walk_subquery=false, arg=0x0) at /src/sql/item.h:1702

#1  0x000055d861469c94 in Item_field::check_valid_arguments_processor (this=0x61d0001a2ca8, bool_arg=0x0) at /src/sql/item.cc:6460

#2  0x000055d860a19097 in Item::walk (this=0x61d0001a2ca8, processor=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>, walk_subquery=false, arg=0x0) at /src/sql/item.h:1704

#3  0x000055d861469d23 in Item_field::check_valid_arguments_processor (this=0x61d0001a2df8, bool_arg=0x0) at /src/sql/item.cc:6461

...

...

#2953 0x000055d861469d23 in Item_field::check_valid_arguments_processor (this=0x61d0001a3238, bool_arg=0x0) at /src/sql/item.cc:6461

#2954 0x000055d860a19097 in Item::walk (this=0x61d0001a3238, processor=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>, walk_subquery=false, arg=0x0) at /src/sql/item.h:1704

#2955 0x000055d86184e738 in fix_fields_part_func (thd=0x62a000060208, func_expr=0x61d0001a3238, table=0x7fe92defacc0, is_sub_part=false, is_create_table_ind=true) at /src/sql/sql_partition.cc:901

#2956 0x000055d8618555bb in fix_partition_func (thd=0x62a000060208, table=0x7fe92defacc0, is_create_table_ind=true) at /src/sql/sql_partition.cc:1998

#2957 0x000055d860f85d5e in open_table_from_share (thd=0x62a000060208, share=0x7fe92defa000, alias=0x55d863599740 <empty_clex_str>, db_stat=0, prgflag=1, ha_open_flags=0, outparam=0x7fe92defacc0, is_create_table=true, partitions_to_open=0x0) at /src/sql/table.cc:3614

#2958 0x000055d860ed23aa in create_table_impl (thd=0x62a000060208, orig_db=0x7fe92defc7e0, orig_table_name=0x7fe92defc7f0, db=0x7fe92defc810, table_name=0x7fe92defc840, path=0x7fe92defd03e "./test/#sql-3c3ea4_4", options=..., create_info=0x7fe92defd4f0, alter_info=0x7fe92defd3f0, create_table_mode=-2, is_trans=0x0, key_info=0x7fe92defbb20, key_count=0x7fe92defbab0, frm=0x7fe92defbbc0) at /src/sql/sql_table.cc:5164

#2959 0x000055d860ef453d in mysql_alter_table (thd=0x62a000060208, new_db=0x62a000064918, new_name=0x62a000064d30, create_info=0x7fe92defd4f0, table_list=0x62b000000348, alter_info=0x7fe92defd3f0, order_num=0, order=0x0, ignore=false) at /src/sql/sql_table.cc:10037

#2960 0x000055d86105e96e in Sql_cmd_alter_table::execute (this=0x62b000000d58, thd=0x62a000060208) at /src/sql/sql_alter.cc:512

#2961 0x000055d860caa153 in mysql_execute_command (thd=0x62a000060208) at /src/sql/sql_parse.cc:6076

#2962 0x000055d860cb5f84 in mysql_parse (thd=0x62a000060208, rawbuf=0x62b000000228 "ALTER TABLE t PARTITION BY HASH(c)", length=34, parser_state=0x7fe92deff8f0, is_com_multi=false, is_next_command=false) at /src/sql/sql_parse.cc:7855

#2963 0x000055d860c8d614 in dispatch_command (command=COM_QUERY, thd=0x62a000060208, packet=0x6290000eb209 "ALTER TABLE t PARTITION BY HASH(c)", packet_length=34, is_com_multi=false, is_next_command=false) at /src/sql/sql_parse.cc:1852

#2964 0x000055d860c8a1cc in do_command (thd=0x62a000060208) at /src/sql/sql_parse.cc:1398

#2965 0x000055d86104e258 in do_handle_one_connection (connect=0x608000000ca8) at /src/sql/sql_connect.cc:1404

#2966 0x000055d86104db54 in handle_one_connection (arg=0x608000000ca8) at /src/sql/sql_connect.cc:1309

#2967 0x000055d8625ff62b in pfs_spawn_thread (arg=0x615000004908) at /src/storage/perfschema/pfs.cc:1869

#2968 0x00007fe938ca7fd4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#2969 0x00007fe938d285bc in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81