Issue
[RHEL 9.2/systemd/BUG] new systemd-logind feature StopIdleSessionSec= does not work when ssh multiplexing is being used after the second session of the same user logged to the system, timeout logic breaks for both sessions.
Additional info:
The main sshd process for the multiplexed user shows two TTYs
eg:
[user@r92 ~]$ ps -ef | grep "sshd: user" | grep -v grep
root
1087
757 0 15:41 ?
00:00:00 sshd: user [priv]
user
1091
1087 0 15:42 ?
00:00:00 sshd: user@pts/1,pts/2
What were you trying to do that didn't work?
Enforce timeout on idle sessions.
Please provide the package NVR for which bug is seen:
[user@r92 ~]$ rpm -q systemd
systemd-252-18.el9.x86_64
How reproducible:
Always
Steps to reproduce
On client side
$ vi ~/.ssh/config
Host *
Enables SSH Multiplexing
ControlPath /tmp/%r@%h:%p
ControlMaster auto
ControlPersist 30m
On server side
vi /etc/systemd/logind.conf
StopIdleSessionSec=30s
systemctl restart systemd-logind
On client side:
$ ssh user@r92
[user@r92 ~]$
On another terminal on the client side
$ ssh user@r92
[user@r92 ~]$
Expected results
After 30 seconds,
[user@r92 ~]$ Shared connection to 192.168.122.X closed.
Actual results
After 30 seconds, no actual closure is observed
[user@r92 ~]$
As root we can see the idle on w output,
[root@r92 ~]# w
15:44:30 up 4 min, 3 users, load average: 0.01, 0.02, 0.00
USER
TTY
LOGIN@
IDLE
JCPU
PCPU WHAT
root
pts/0
15:44
0.00s 0.01s 0.00s w
user
pts/1
15:42
46.00s 0.02s 0.02s -bash
user
pts/2
15:42
2:12
0.01s 0.01s -bash
