1.11.1-beta13.1 (build: 8193) hangs on quit

Expected behavior

That Docker shuts down properly

Actual behavior

Simply hangs

Information

$ pinata diagnose -u
OS X: version 10.11.5 (build: 15F34)
Docker.app: version v1.11.1-beta13.1
Running diagnostic tests:
[OK] Moby booted
[OK] driver.amd64-linux
[OK] vmnetd
[OK] osxfs
[OK] db
[OK] slirp
[OK] menubar
[OK] environment
[OK] Docker
[OK] VT-x

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