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Description of problem:
SSH X11 forwarding without launching X Window Server on the client side causes half of the key inputs to disappear. This problem is caused by dbus-launch consuming stdin.
Need to fix /etc/profile.d/ssh-x-forwarding.(c)sh which was added in #1874282.
How reproducible:
Steps to Reproduce:
1. Prepare SSH client environment without X Window Server.
This can be done on Linux without running X Window Server, or on Windows.
2. Log into to a system via SSH with the -Y option.
Actual results:
Half of the key inputs before entering Ctrl + C disappear.
Expected results:
The key inputs does not disappear.
Additional info:
This behavior is described in the man of dbus-launch. If you start dbus-launch with --exit-with-session, it will monitor terminal until HUP is input from stdin if it can't connect to X server. This is the reason for the statement "This option is not recommended". I suggest using --exit-with-x11 instead.
I think there is more to fix in /etc/profile.d/ssh-x-forwarding.(c)sh.
Running 'ssh -X user@hosta xterm' works as expected and the xterm window shows up. The problem is when you terminate the xterm with 'exit', the ssh call is not terminated and hangs. The reason is that dbus-launch on hosta keeps running and doesn't terminate.
The same also happens with rsync calls which makes them hang. More details can also be found in https://bugzilla.redhat.com/show_bug.cgi?id=1874282
This all works fine in dbus-1.12.8-11 but is broken in dbus-1.12.8-12.
I've just tried with the latest dbus-1.12.8-14 from CentOS 8 Stream and the bug still persists.
I'm wondering what 'All tests from our test suit pass' means when a simple 'ssh -X user@hosta xterm' doesn't work correctly.
Am I missing something?
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (dbus bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:4365