pt-online-schema-change segfaults on AWS RDS

Polyglot Projects Percona Toolkit
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Can you help me please understand why pt-osc fails when I run on Amazon AWS RDS both for --alter “Engine=InnoDB” and for --alter “ADD name CHAR(30)” ?

Thanks in advance!

ubuntu@ip-10-x-x-x:~$ pt-online-schema-change --alter=“Engine=InnoDB” --host=rds-x.eu-west-1.rds.amazonaws.com --user=x --password=x D=db,t=tb --execute --recursion-method=none --statistics
No slaves found. See --recursion-method if host ip-x-x-x-x has slaves.
Not checking slave lag because no slaves were found and --check-slave-lag was not specified.
Operation, tries, wait:
copy_rows, 10, 0.25
create_triggers, 10, 1
drop_triggers, 10, 1
swap_tables, 10, 1
update_foreign_keys, 10, 1
Altering db.tb…
Creating new table…
Created new table db._tb_new OK.
Altering new table…
Altered db._tb_new OK.
2014-07-21T13:55:31 Creating triggers…
2014-07-21T13:55:31 Dropping triggers…
2014-07-21T13:55:31 Dropped triggers OK.
2014-07-21T13:55:31 Dropping new table…
2014-07-21T13:55:32 Dropped new table OK.

Event Count

============= =====

INSERT 0

retry_fail 1

unknown_error 1

db.tb was not altered.
Segmentation fault (core dumped)

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FYI: This is the table structure:

mysql > show create table tb \G
*************************** 1. row ***************************
Table: tb
Create Table: CREATE TABLE tb (
id int(10) unsigned NOT NULL AUTO_INCREMENT,
value int(10) unsigned NOT NULL,
timestamp timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (id)
) ENGINE=MyISAM AUTO_INCREMENT=4 DEFAULT CHARSET=utf8
1 row in set (0.00 sec)

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