Can't use a default profile

[sathed]

I ran in to an issue recently where I kept getting prompted for a password. Entering the correct password resulted in another password prompt:

$ aws s3 ls
Password: 
Password: 
Password: 

It keeps doing this until I enter an incorrect password or ^C out of it.

After some serious debugging, I discovered that this is because I was using a default profile in my .aws/config:

[profile default]
credential_process = awsprocesscreds-saml ...

Changing that to anything other than default fixes the problem.

Does anyone know a way around this? For an interim fix, I've created a bash alias that invokes aws --profile my_profile, but a real fix would be nice to have.