Right now my system is doing disk IO when I switch from a text console on tty6 to GNOME on tty3. 1.4GB of swap is in use.

On tty6, I ran sudo lsof -p 1 | grep dev, to check if it was a similar issue to "What could be using 6GB of my swap?". Based on the background information there, I would expect PID 1 to have open file descriptors for /dev/dri/.... But it didn't have any!

The same is true when I ran the command from tty3. The output is different though, as it now includes open file descriptors for /dev/input/....

These results are repeatable, if I switch back to tty3 and try again etc.

N.B. This is code that I have touched in upstream systemd, so it could well be my fault :-). Looking at the systemd git commit messages for src/login, I can't find a clear deliberate change in this behaviour.

I have a VM for each of Fedora 27 and Fedora 28. They Fedora 27 looks ok when I boot them and run lsof on the serial console. However, on the Fedora 28 VM, if I run chvt 6, then the same problem shows up.

EDIT: this apparent regression goes away if I set SELinux to "permissive" (policy violations are logged, but allowed). I've submitted it as an issue in Fedora. SELinux interferes with systemd-logind restart code

This does not happen on the Fedora 27 VM with

  • systemd-234-10.git5f8984e.fc27.x86_64
  • gnome-shell-3.26.2-5.fc27.x86_64

1 Answer 1


I think the VT switch caused gnome-shell to release input devices (ReleaseDevice method in logind dbus API). This causes logind to remove the FD for the device.

So this is most likely affected by the issue #8344 "session_device_free(sd) also drops all other device fds of that session" . A fix is merged for systemd v239.

I confirmed this by testing a pre-release version of systemd, which included the fix.

... to check if it was a similar issue to "What could be using 6GB of my swap?"

Quite possibly. The fix for that is also merged for v239, and hence not present in systemd-238-7.fc28.1.x86_64.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.