[remote rejected] master -> master (n/a (unpacker error))

Today, just after someone else committed to my public repository I started getting errors. Until then Git worked great.

Does anyone know what is going on here? Are there particular versions of Git with known issues around this?

uname@hostname:~/dev/workspaces/scm-evaluations/welcome.git/install/git-config$ git push Counting objects: 7, done. Delta compression using up to 2 threads. Compressing objects: 100% (4/4), done. Writing objects: 100% (4/4), 922 bytes, done. Total 4 (delta 0), reused 4 (delta 0) error: unable to create temporary sha1 filename ./objects/e6: File exists

fatal: failed to write object
error: unpack failed: unpacker exited with error code
To ssh://git.projectbedrock.com/var/cache/git/welcome.git
 ! [remote rejected] master -> master (n/a (unpacker error))
error: failed to push some refs to
'ssh://git.projectbedrock.com/var/cache/git/welcome.git'

As an aside, where the heck is the git bug tracker? I've searched, and searched, and ... All I found is a Debian tracking system, which appears to have no full text search capabilities.