Segfault on CREATE TABLE with explicit FTS_DOC_ID_INDEX by multiple fields

--source include/have_innodb.inc

--error ER_WRONG_NAME_FOR_INDEX

create table t1 (

  f1 int, f2 text,

  FTS_DOC_ID bigint unsigned not null,

  unique key FTS_DOC_ID_INDEX(FTS_DOC_ID, f1),

  fulltext (f2))

engine=innodb;

#3  <signal handler called>

#4  0x0000000000fcd837 in fts_drop_all_index_tables (trx=0x7f22ea2d0218, fts=0x0) at /home/midenok/src/mariadb/10.2/src/storage/innobase/fts/fts0fts.cc:1673

#5  0x0000000000fcbbd2 in fts_drop_tables (trx=0x7f22ea2d0218, table=0x7f2298006600) at /home/midenok/src/mariadb/10.2/src/storage/innobase/fts/fts0fts.cc:1713

#6  0x0000000000d9ac3c in row_drop_ancillary_fts_tables (table=0x7f2298006600, trx=0x7f22ea2d0218) at /home/midenok/src/mariadb/10.2/src/storage/innobase/row/row0mysql.cc:3177

#7  0x0000000000d97cad in row_drop_table_for_mysql (name=0x7f22e96ebf10 "test/t1", trx=0x7f22ea2d0218, sqlcom=SQLCOM_TRUNCATE, create_failed=true, nonatomic=false) at /home/midenok/src/mariadb/10.2/src/storage/

innobase/row/row0mysql.cc:3707

#8  0x0000000000c45b54 in ha_innobase::create (this=0x7f2298187ad0, name=0x7f22e96ef690 "./test/t1", form=0x7f22e96ec988, create_info=0x7f22e96efc20, file_per_table=true, trx=0x7f22ea2d0218) at /home/midenok/src/mariadb/10.2/src/storage/innobase/handler/ha_innodb.cc:13090

#9  0x0000000000c290cf in ha_innobase::create (this=0x7f2298187ad0, name=0x7f22e96ef690 "./test/t1", form=0x7f22e96ec988, create_info=0x7f22e96efc20) at /home/midenok/src/mariadb/10.2/src/storage/innobase/handler/ha_innodb.cc:13137

#10 0x00000000009ce213 in handler::ha_create (this=0x7f2298187ad0, name=0x7f22e96ef690 "./test/t1", form=0x7f22e96ec988, info_arg=0x7f22e96efc20) at /home/midenok/src/mariadb/10.2/src/sql/handler.cc:4507

#11 0x00000000009cf48f in ha_create_table (thd=0x7f2298000d28, path=0x7f22e96ef690 "./test/t1", db=0x7f2298012148 "test", table_name=0x7f2298011ae0 "t1", create_info=0x7f22e96efc20, frm=0x7f22e96ef680) at /home/midenok/src/mariadb/10.2/src/sql/handler.cc:4879

#12 0x000000000085b52b in rea_create_table (thd=0x7f2298000d28, frm=0x7f22e96ef680, path=0x7f22e96ef690 "./test/t1", db=0x7f2298012148 "test", table_name=0x7f2298011ae0 "t1", create_info=0x7f22e96efc20, file=0x7f2298012bf0, no_ha_create_table=false) at /home/midenok/src/mariadb/10.2/src/sql/unireg.cc:429

#13 0x00000000007f5312 in create_table_impl (thd=0x7f2298000d28, orig_db=0x7f2298012148 "test", orig_table_name=0x7f2298011ae0 "t1", db=0x7f2298012148 "test", table_name=0x7f2298011ae0 "t1", path=0x7f22e96ef690 "./test/t1", options=..., create_info=0x7f22e96efc20, alter_info=0x7f22e96efb78, create_table_mode=0, is_trans=0x7f22e96ef9b7, key_info=0x7f22e96ef8a0, key_count=0x7f22e96ef89c, frm=0x7f22e96ef680) at /home/midenok/src/mariadb/10.2/src/sql/sql_table.cc:4960

#14 0x00000000007f46c6 in mysql_create_table_no_lock (thd=0x7f2298000d28, db=0x7f2298012148 "test", table_name=0x7f2298011ae0 "t1", create_info=0x7f22e96efc20, alter_info=0x7f22e96efb78, is_trans=0x7f22e96ef9b7, create_table_mode=0) at /home/midenok/src/mariadb/10.2/src/sql/sql_table.cc:5070

#15 0x00000000007f5ab1 in mysql_create_table (thd=0x7f2298000d28, create_table=0x7f2298011b30, create_info=0x7f22e96efc20, alter_info=0x7f22e96efb78) at /home/midenok/src/mariadb/10.2/src/sql/sql_table.cc:5135

#16 0x00000000008085cf in Sql_cmd_create_table::execute (this=0x7f2298011b10, thd=0x7f2298000d28) at /home/midenok/src/mariadb/10.2/src/sql/sql_table.cc:10979

#17 0x0000000000710dfc in mysql_execute_command (thd=0x7f2298000d28) at /home/midenok/src/mariadb/10.2/src/sql/sql_parse.cc:5993

#18 0x0000000000704a00 in mysql_parse (thd=0x7f2298000d28, rawbuf=0x7f2298011948 "create table t1 (\nf1 int, f2 text,\nFTS_DOC_ID bigint unsigned not null,\nunique key FTS_DOC_ID_INDEX(FTS_DOC_ID, f1),\nfulltext (f2))\nengine=innodb", length=145, parser_state=0x7f22e96f25f0, is_com_multi=false, is_next_command=false) at /home/midenok/src/mariadb/10.2/src/sql/sql_parse.cc:7762

#0  fts_free (table=0x7f51f001b3f0) at /home/midenok/src/mariadb/10.3/src/storage/innobase/fts/fts0fts.cc:5402

#1  0x0000000000daa62f in create_table_info_t::create_table (this=0x7f52340ec4a0, create_fk=true) at /home/midenok/src/mariadb/10.3/src/storage/innobase/handler/ha_innodb.cc:12373

#2  0x0000000000dcb69c in ha_innobase::create (this=0x7f51f001a770, name=0x7f52340effe0 "./test/t1", form=0x7f52340ed1d0, create_info=0x7f52340f05e8, file_per_table=true, trx=0x7f525dbb3178) at /home/midenok/src/mariadb/10.3/src/storage/innobase/handler/ha_innodb.cc:12860

12353                   ret = innobase_fts_check_doc_id_index_in_def(

12354                           m_form->s->keys, m_form->key_info);

12355

12356                   switch (ret) {

12357                   case FTS_INCORRECT_DOC_ID_INDEX:

12358                           push_warning_printf(m_thd,

12359                                               Sql_condition::WARN_LEVEL_WARN,

12360                                               ER_WRONG_NAME_FOR_INDEX,

12361                                               " InnoDB: Index name %s is reserved"

12362                                               " for the unique index on"

12363                                               " FTS_DOC_ID column for FTS"

12364                                               " Document ID indexing"

12365                                               " on table %s. Please check"

12366                                               " the index definition to"

12367                                               " make sure it is of correct"

12368                                               " type\n",

12369                                               FTS_DOC_ID_INDEX_NAME,

12370                                               m_table->name.m_name);

12371

12372                           if (m_table->fts) {

12373                                   fts_free(m_table);

12374                           }

12375

12376                           my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0),

12377                                    FTS_DOC_ID_INDEX_NAME);

12378                           DBUG_RETURN(-1);

#0  0x00000000012337c7 in fts_drop_all_index_tables (trx=0x7f525dbb3178, fts=0x0) at /home/midenok/src/mariadb/10.3/src/storage/innobase/fts/fts0fts.cc:1672

#1  0x0000000001231742 in fts_drop_tables (trx=0x7f525dbb3178, table=0x7f51f001b3f0) at /home/midenok/src/mariadb/10.3/src/storage/innobase/fts/fts0fts.cc:1712

#2  0x0000000000f86444 in row_drop_ancillary_fts_tables (table=0x7f51f001b3f0, trx=0x7f525dbb3178) at /home/midenok/src/mariadb/10.3/src/storage/innobase/row/row0mysql.cc:3256

#3  0x0000000000f82c88 in row_drop_table_for_mysql (name=0x7f52340ec730 "test/t1", trx=0x7f525dbb3178, sqlcom=SQLCOM_TRUNCATE, create_failed=true, nonatomic=false) at /home/midenok/src/mariadb/10.3/src/storage/innobase/row/row0mysql.cc:3729

#4  0x0000000000dcb726 in ha_innobase::create (this=0x7f51f001a770, name=0x7f52340effe0 "./test/t1", form=0x7f52340ed1d0, create_info=0x7f52340f05e8, file_per_table=true, trx=0x7f525dbb3178) at /home/midenok/src/mariadb/10.3/src/storage/innobase/handler/ha_innodb.cc:12866

1711            if (error == DB_SUCCESS) {

1712                    error = fts_drop_all_index_tables(trx, table->fts);

1713            }

--- a/storage/innobase/fts/fts0fts.cc

+++ b/storage/innobase/fts/fts0fts.cc

@@ -1708,7 +1708,7 @@ fts_drop_tables(

        error = fts_drop_common_tables(trx, &fts_table);

-       if (error == DB_SUCCESS) {

+       if (error == DB_SUCCESS && table->fts) {

                error = fts_drop_all_index_tables(trx, table->fts);

        }