Comment 6 for bug 1364457

In any case foreign keys referencing table ALTERed play important role here, as assertion happens in the following code:

   2666 /**********************************************************************//**
   2667 Looks for the foreign constraint from the foreign and referenced lists
   2668 of a table.
   2669 @return foreign constraint */
   2670 static
   2671 dict_foreign_t*
   2672 dict_foreign_find(
   2673 /*==============*/
   2674 dict_table_t* table, /*!< in: table object */
   2675 const char* id) /*!< in: foreign constraint id */
   2676 {
...
   2695 if (table->referenced_rbt != NULL) {
   2696 ut_a(UT_LIST_GET_LEN(table->referenced_list)
   2697 == rbt_size(table->referenced_rbt));
   2698 node = rbt_lookup(table->referenced_rbt, id);
...

So, can you, please, check if the table is referenced by foreign keys from some other tables, and if it is (as I assume), share SHOW CREATE TABLE output (edited if needed) for them?