错误：git-upload-pack因信号13而死亡 gitlab

我有一个运行在Mac OS X 10.9.2上的GitLab服务器（版本为6.7.2），使用git 1.9.2。这个服务器上有两个仓库。其中一个可以成功克隆，但另一个失败了，提示：

$ git clone http://*/gamil/gamil.git
Cloning into 'gamil'...
remote: Counting objects: 426, done.
remote: Compressing objects: 100% (375/375), done.
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed

我在GitLab中检查了unicorn.stderr.log，发现

I, [2014-04-21T23:03:58.761225 #4929]  INFO -- : master process ready
I, [2014-04-21T23:03:58.764556 #4940]  INFO -- : worker=0 ready
I, [2014-04-21T23:03:58.766098 #4941]  INFO -- : worker=1 ready
error: git-upload-pack died of signal 13

这个错误是什么原因导致的？如何修复它？提前感谢！

编辑1：我检查了存储库：

$ git fsck
Checking object directories: 100% (256/256), done.
Checking objects: 100% (426/426), done.

看起来一切都很好，但是无法克隆到本地计算机。

编辑2:

我已经更新了GitLab到6.8版，但没有运气。

编辑3:

我可以通过ssh协议克隆有问题的存储库。

$ git clone dongli@<...>:gamil
Cloning into 'gamil'...
remote: Counting objects: 426, done.
remote: Compressing objects: 100% (317/317), done.
remote: Total 426 (delta 89), reused 426 (delta 89)
Receiving objects: 100% (426/426), 821.19 KiB | 0 bytes/s, done.
Resolving deltas: 100% (89/89), done.
Checking connectivity... done.

编辑4:

我检查了 unicorn.rb 中的超时时间:

# nuke workers after 30 seconds instead of 60 seconds (the default)
timeout 300

以及 nginx 的配置：

# if a file, which is not found in the root folder is requested,
# then the proxy pass the request to the upsteam (gitlab unicorn)
location @gitlab {
  proxy_read_timeout 300; # Some requests take more than 30 seconds.
  proxy_connect_timeout 300; # Some requests take more than 30 seconds.
  proxy_redirect     off;

  proxy_set_header   X-Forwarded-Proto $scheme;
  proxy_set_header   Host              $http_host;
  proxy_set_header   X-Real-IP         $remote_addr;
  proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;

  proxy_pass http://gitlab;
}

编辑5

我已将代码库上传至GitHub，克隆操作正常：

$ git clone https://github.com/dongli/GAMIL.git 1
Cloning into '1'...
remote: Counting objects: 355, done.
remote: Compressing objects: 100% (308/308), done.
remote: Total 355 (delta 35), reused 355 (delta 35)
Receiving objects: 100% (355/355), 809.75 KiB | 244.00 KiB/s, done.
Resolving deltas: 100% (35/35), done.
Checking connectivity... done.

所以这个代码库是好的。