Hi All, I've been struggling with this issue off and on for the better part of a month now. Having implemented a simple git SSH server using some of the Conch examples in the official documentation, I encountered an issue that would cause a git client to throw an error only part of the time. The little program to reproduce the issue is found at http://gist.github.com/321403 (raw version for download) http://gist.github.com/raw/321403/82ab2111a2709c8fe50a77aabb08565749087408/g... and can be executed to start the sample server. Run a command like # The /abspath/to/git/repo should be readable by the server user $ git clone ssh://user@localhost:2222/abspath/to/git/repo (password "user") To test the server. On my workstation, I am able to reproduce the error at least once every 5 tries. It's definitely not consistent. The behavior I see is attached at the end of this email. The client fails due to a premature inConnectionLost() call in the SSHSessionProcessProtocol that sends an EOF. As a workaround, when TraceProcessProtocol.inConnectionLost() is overriden to do nothing, the client error goes away. This is somewhat foreign territory for me so I'm not sure whether it's a bug in git or whether it's a bug in the twisted ProcessProtocol implementation. RFC 4254 isn't terribly helpful here: 5.3. Closing a Channel When a party will no longer send more data to a channel, it SHOULD send SSH_MSG_CHANNEL_EOF. So on the surface the current behavior of sending an EOF appears fine, however, I can't really find any definitive cases of this type of problem popping up via, say, default OpenSSH/git combinations. Any advice? Is the gitconnbug.py implementation flawed? Should I open a ticket? Any git experts know of a case where git-upload-pack might close it's stdout pipe? Thanks, Bo Successful case (server side logging, timestamp cut out): [SSHChannel session (0) on SSHService ssh-connection on SSHServerTransport,1,127.0.0.1] executing command "git-upload-pack '/Users/bshi/sandbox/poop'" [-] TPP.outReceived(...) 199 bytes [-] TPP.outReceived(...) 146 bytes [-] TPP.outReceived(...) 8 bytes [-] TPP.outReceived(...) 33 bytes [-] TPP.outReceived(...) 41 bytes [-] TPP.outReceived(...) 77 bytes [-] TPP.outReceived(...) 1228 bytes [-] TPP.outReceived(...) 8192 bytes [-] TPP.outReceived(...) 4567 bytes [-] TPP.inConnectionLost() [-] sending eof [-] exitCode: 0 Successful case (client-side shell session): $ GIT_TRACE=1 git clone ssh://user@localhost:2222/Users/bshi/sandbox/poop trace: built-in: git 'clone' 'ssh://user@localhost:2222/Users/bshi/sandbox/poop' Initialized empty Git repository in /tmp/poop/.git/ trace: run_command: 'ssh' '-p' '2222' 'user@localhost' 'git-upload-pack '\''/Users/bshi/sandbox/poop'\''' user@localhost's password: trace: run_command: 'index-pack' '--stdin' '-v' '--fix-thin' '--keep=fetch-pack 763 on Bo-Shis-MacBook-Pro.local' trace: exec: 'git' 'index-pack' '--stdin' '-v' '--fix-thin' '--keep=fetch-pack 763 on Bo-Shis-MacBook-Pro.local' trace: exec: 'git-index-pack' '--stdin' '-v' '--fix-thin' '--keep=fetch-pack 763 on Bo-Shis-MacBook-Pro.local' trace: run_command: 'git-index-pack' '--stdin' '-v' '--fix-thin' '--keep=fetch-pack 763 on Bo-Shis-MacBook-Pro.local' remote: Counting objects: 50, done. remote: Compressing objects: 100% (35/35), done. remote: Total 50 (delta 16), reused 43 (delta 14) Receiving objects: 100% (50/50), 12.36 KiB, done. Resolving deltas: 100% (16/16), done. Failure case (server side): [SSHChannel session (0) on SSHService ssh-connection on SSHServerTransport,2,127.0.0.1] executing command "git-upload-pack '/Users/bshi/sandbox/poop'" [-] TPP.outReceived(...) 345 bytes [-] TPP.outReceived(...) 8 bytes [-] TPP.outReceived(...) 33 bytes [-] TPP.outReceived(...) 8192 bytes [-] TPP.inConnectionLost() [-] sending eof [-] TPP.outReceived(...) 5903 bytes [-] exitCode: 0 [-] sending request exit-status [-] sending close 0 Failure case ("trace:" messages similar, cut out for readability): $ GIT_TRACE=1 git clone ssh://user@localhost:2222/Users/bshi/sandbox/poop user@localhost's password: ... ... remote: Counting objects: 50, done. fatal: The remote end hung up unexpectedly fatal: early EOF fatal: index-pack failed