(I'm not sure if this is the right place)
I've been seeing this in 1.8.3.3 and 1.8.3.4:
$ git status
fatal: index file open failed: Permission denied
So I do a chmod and chown, do my commit etc. A while later the error is back.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.2 LTS
Release: 12.04
Codename: precise
$ git --version
git version 1.8.3.4
I upgraded to 1.8.3.4 hoping that it would fix it but no luck.