Bug #16532 mysql server assert in debug if table det is removed

Description:
removing table definition causes assert to trigger

How to repeat:
create table t1 (a int primary key, b int);
insert into t1 values(1,1);
rm test/t1.*
create table t1 (a int primary key, b int, c int);

-->

ERROR 2013 (HY000): Lost connection to MySQL server during query

#12 0x08305e5e in mysql_create_table(THD*, char const*, char const*, st_ha_create_information*, List<create_field>&, List<Key>&, bool, unsigned) (
    thd=0x92fa290, db=0x92c16e0 "test", table_name=0x93077b0 "t2", create_info=0x92fa828, fields=@0x92fa74c, keys=@0x92fa740, 
    internal_tmp_table=false, select_field_count=0) at sql_table.cc:1943
1943        DBUG_ASSERT(get_cached_table_share(db, alias) == 0);

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2 to server version: 5.1.6-alpha-debug

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> create table t1 (a int primary key, b int, c int);
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql>

I have been noticing this as well. We may not be able to support this any longer. Kostja's team gets to own the table definition cache.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/9340

Will be fixed in 5.1.12

Noted in 5.1.12 changelog.

If the files for an open table were removed at the OS level (external
to the server), the server exited with an assertion failure.