Recently we got a crash on our MariaDB server, the call stack is

alloc_histograms_for_table_share

read_histograms_for_table

read_statistics_for_tables_if_needed

open_and_lock_tables

The main problem is that the it try to read histogram of a performance schema table. In my understand, only TABLE_CATEGORY_USER should be read statistics because on open_and_process_table it only init stats when table is TABLE_CATEGORY_USER.
But when try to read histogram, when call statistics_for_tables_is_needed, the statistics_for_tables_is_needed return true instead of false.
I found in this commit https://github.com/MariaDB/server/commit/10f6b7001bd7b683c013ae407c2c48793caa3633 ,
the code changed from

if (table_share && 

(table_share->table_category != TABLE_CATEGORY_USER ||

           table_share->tmp_table != NO_TMP_TABLE))

 return FALSE;

to

 if (table_share && 

 table_share->table_category != TABLE_CATEGORY_USER

          && is_stat_table(tl->db, tl->alias))

return FALSE;

which means only mysql stats table will be ignored. This code change may be not correct.