Segmentation fault on rake db:create, multiple rubies, multiple dbs

I'm getting segmentation faults every time I try to create a db on a fresh Rails 3.0.0.beta4 app. Here's the Ruby 1.9.2-head output:

https://gist.github.com/92ea2728cdab5bfe4844

The same occurs for each of these rubies I've tried on my Snow Leopard machine:

   ree-1.8.7-2010.02 [ x86_64 ]
   ruby-1.8.7-p249 [ x86_64 ]
=> ruby-1.9.2-head [ x86_64 ]
   ruby-1.9.2-rc2 [ x86_64 ]

I've also tried sqlite3-ruby and pg gems in I think all of the rubies.

My Gemfile looks like this:

https://gist.github.com/af68170253715725a56e

All I've done is create the Rails app, alter the Gemfile, gem install bundler, bundle install, and rake db:create. I'm using rvm to create a new gemset and switch between rubies.