failed git push.

How should I do?

$ git push origin master
Enter passphrase for key '/home/user/.ssh/id_rsa':
Counting objects: 27, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (24/24), done.
error: unable to create temporary sha1 filename ./objects/9d: File exists

fatal: failed to write object
Writing objects: 100% (24/24), 351.80 KiB, done.
Total 24 (delta 3), reused 0 (delta 0)
error: unpack failed: unpacker exited with error code
To ssh://user@hoge.com/git/hoge.git
 ! [remote rejected] master -> master (n/a (unpacker error))
error: failed to push some refs to 'ssh://user@hoge.com/git/hoge.git'