Git 2.3.7 hangs on fetch but not clone

["Randall S. Becker" <rsbecker@nexbridge.com>]

I have some strange behaviour I am trying to diagnose on the NonStop port of
git 2.3.7. The situation is we have a *LARGE* cloned repository with some
local modifications of openssl, which we are trying to clone again for a
Jenkins build. The command:
	git clone /local/openssl openssl
works fine and rapidly (well under 30 seconds), but with a newly created
empty repo, simulating what the Jenkins Git plugin does:
	mkdir /local/test/openssl
	cd /local/test/openssl
	git init /local/test/openssl
	git -c core.askpass=true fetch --verbose --progress
/local/git/openssl +refs/heads/*:refs/remotes/origin/*
does the usual:
	remote: Counting objects: 113436, done.
	remote: Compressing objects: 100% (23462/23462), done.
then hangs forever without creating any files in the working directory.
There are also no files or directories modified since the init operation.
Processes left around, and without consuming resources, are:
1493172290 2030043151 - 15:58:29       00:15 git pack-objects --revs --thin
--stdout --progress --delta-base-offset --include-tag
452984908  402653262 - 15:58:29       00:00 git -c core.askpass=true fetch
--verbose --progress /local/git/openssl +refs/heads/*:refs/remotes/origin/*
402653262 1694498903 - 15:58:28       00:00 git -c core.askpass=true fetch
--verbose --progress /local/git/openssl +refs/heads/*:refs/remotes/origin/*
2030043151  402653262 - 15:58:29       00:00 git-upload-pack
/local/git/openssl

This does not happen for our smaller repositories. Any pointers on where to
look would be appreciated.

Kindly,
Randall

-- Brief whoami: NonStop&UNIX developer since approximately
UNIX(421664400)/NonStop(211288444200000000)
-- In my real life, I talk too much.