Call to git ls-tree sometimes hangs?

[ryanfb]

In trying to diagnose a publication submission stuck during the copy_branch_from_repo step, I noticed the following hung git process:

git --git-dir=/srv/data/papyri.info/sosol/repo/users/PaulvdLaan.git ls-tree 759059f7db40f234b9a61dd9637f86d1efe14b5a

However, running the command as myself it finished and returned fairly quickly. I had to kill the git process and copy the branch manually using git fetch inside the board repo. Not entirely sure what was causing this, but this publication (48806) failed to submit on many occasions.