Bug #17129 Partitions: coalesce fails

Description:
I create a table with many partitions. I try to coalesce.
I get an error, referring to a nonexistent file.

How to repeat:
mysql> create table txf (s1 int) partition by hash (s1) partitions 500;
Query OK, 0 rows affected (0.30 sec)

mysql> alter table txf coalesce partition 499;
ERROR 29 (HY000): File './db1/txf#P#p498.MYD' not found (Errcode: 24)

I don't see anything in the manual that says
that such an ALTER TABLE should fail.
Certainly it shouldn't fail with two different
error messages, depending on machine.

What sort of "feedback"is required here?

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.mysql.com/documentation/ and the instructions on
how to report a bug at http://bugs.mysql.com/how-to-report.php

Additional info:

This problem is described in the manual:
http://dev.mysql.com/doc/refman/5.1/en/not-enough-file-handles.html