We now have Docker 1.9.0 that runs on CircleCI. To use it, you can add the following to your circle.yml. This version has not been tested yet on CircleCI, so please use it with a care. Any bug/issue reports are welcome!
I double-checked that circle.yml still works. Please look at this build. Since you have to stop Docker, probably it’s started before downloading docker 1.9 somehow?