pgagent errors on application_name

To wit:

postgres@9c7b33848038:~$ pgagent -l pgagent.log -f dbname=postgres
user=postgres application_name=pgagent
ERROR: Primary connection string is not valid!
18:15:15: Debug: In file ../src/unix/threadpsx.cpp at line 261:
'pthread_mutex_destroy()' failed with error 0x00000010 (Device or
resource busy).

I'm unclear on why this would be failing, though; AFAICT, connection.h
doesn't do anything but wrap the basic libpq connection class.  Ideas?

BTW, when we fix this, I'd like to set a default application_name of
"pgagent" if the user does not supply one.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com