systemd version the issue has been seen with

258-rc3

Used distribution

Fedora 44

Linux kernel version used

6.17.0-0.rc2.250821g068a56e56fa8.27.fc44.x86_64

CPU architectures issue was seen on

x86_64

Component

systemd-logind

Expected behaviour you didn't see

Kmscon can't create multiple logind sessions on the same vt. Kmscon can create multiple terminals running on the same vt when used with --session-control. Only the first terminal will create a logind session when a user logs in. All other terminals will be sessionless.

Unexpected behaviour you saw

This check in the manager_create_session function in the file logind-dbus.c prevents multiple sessions from being on the same vt.

if (class != SESSION_GREETER &&
            vtnr > 0 &&
            vtnr < MALLOC_ELEMENTSOF(m->seat0->positions) &&
            m->seat0->positions[vtnr] &&
            m->seat0->positions[vtnr]->class != SESSION_GREETER) {
                return log_debug_errno(SYNTHETIC_ERRNO(EADDRNOTAVAIL), "VT already occupied by a session.");

Steps to reproduce the problem

Run kmscon with --session-control and --vt=n where n is any vt number in order to run kmscon on a vt. Login to the first terminal session. Create a new terminal session with Ctrl+Super+Enter. Login to that terminal session too. Run loginctl and see that only one logind session is created.

Additional program output to the terminal or log subsystem illustrating the issue