'git pull' hangs on 'Initializing Keybase... done'

On one of my machines, running 'git pull' hangs after printing 'Initializing Keybase... done'. The strange thing is that it doesn't happen on my other machine.

My log id: e28a6ab060c45a5f3a4c0b1c

The machine on which it hangs runs macOS El Capitan, Keybase client 1.0.45-20180305194145+3a1c65a05.

I noticed in `keybase status` that a bunch of git-remote-keybase processes were hanging...

~~~
Other users:
git-remote-keybase git (redacted) [pid: 87793, version: 1.0.2-20180305194232+2120dde5]
git-remote-keybase git (redacted) [pid: 87849, version: 1.0.2-20180305194232+2120dde5]
git-remote-keybase git (redacted) [pid: 87915, version: 1.0.2-20180305194232+2120dde5]
git-remote-keybase git (redacted) [pid: 86422, version: 1.0.2-20180305194232+2120dde5]
~~~

...probably because of my multiple 'git pull' attempts. Killing these processes did not help.

Start by reproducing the hang on macOS El Capitan with the reported Keybase client version, using the supplied log ID and the `git pull` and `keybase status` commands. Investigate the hanging `git-remote-keybase` processes; done means the cause is identified and `git pull` completes without leaving those processes stuck.

Written by the indexing model from the issue text.