mysqldump warning

[nixofortune]

Hello everybody.
I'm trying to create a backup of mysql database:

mysqldump --all-databases --routines --master-data=2 > all_databases_`date
+'%y%m%d-%H%M'`.sql

It looks like backup has been created but I've got this Warning:

Warning: mysqldump: ignoring option '--databases' due to invalid value
'temp_fwd'

Nothing in the error logs, just curious what this warning means.
Does anybody had similar thing?

Many thanks.