Here is error 500 in phab.quadas.com-access_log:
10.0.252.217 - - [20/Jun/2017:16:02:36 +0800] "GET /source/localrepo.git/info/refs?service=git-upload-pack HTTP/1.1" 401 63
10.0.252.217 - xxname [20/Jun/2017:16:02:36 +0800] "GET /source/localrepo.git/info/refs?service=git-upload-pack HTTP/1.0" 500 62