Description of problem:

• User has "ForwardX11 yes" in ~/.ssh/config or in /etc/ssh/ssh_config
• Git server runs on RHEL 8.5
• User attempts to clone a repository over ssh
• Git hangs

Version-Release number of selected component (if applicable):

• RHEL 8.5
• dbus-1.12.8-14.el8.x86_64
• git-2.27.0-1.el8.x86_64
• openssh-clients-8.0p1-10.el8.x86_64
• openssh-server-8.0p1-10.el8.x86_64

How reproducible:

Always

Steps to Reproduce:

Using same machine and user for server and client, for simplicity:

1. Enable X11 forwarding for SSH server and client

1. echo ForwardX11 yes >> /etc/ssh/ssh_config
2. echo ForwardX11 yes >> /etc/ssh/sshd_config
3. systemctl restart sshd.service

2. Create git repository

1. mkdir /opt/test-repo
2. chown test-user:test-user /opt/test-repo

Run below commands as "test-user" on a gnome-terminal

$ cd /opt/test-repo
$ git init
$ git commit -m test

3. Try to clone the repository over ssh

Rum below commands on a gnome-terminal (must have a DISPLAY)

$ git clone localhost:/opt/test-repo

Actual results:

Cloning into 'test-repo'...
test-user@localhost's password:
remote: Enumerating objects: 3, done.
remote: Counting objects: 100% (3/3), done.
remote: Total 3 (delta 0), reused 0 (delta 0), pack-reused 0
Receiving objects: 100% (3/3), done.
[hang, must be interrupted with Ctrl-C]

Expected results:

No hang

Additional info:

It' caused by bug 1940067: With dbus 1.12.8-12.el8_3 ssh session executing
single command hang (which in its turn is a regression of bug 1874282).

So ssh hangs after running git-upload-pack at the server side.

It is possible to circumvent the bug with a system-wide configuration to
make git run ssh with the "-x" argument, which disables X11 forwarding:

1. git config --system core.sshCommand 'ssh -x'

git should always run ssh with the "-x" argument to prevent errors related
to X11 forwarding, which has been a problematic feature.