Running as superuser never actually exits

[metal450]

When Syncthing is configured to run as superuser, exiting the app doesn't stop it from syncing:

• If I go to Menu->Exit, the SyncThing statusbar icon disappears (as expected), but it’s actually still silently syncing in the background (which there is no indication of, except that I see changes to the phone’s files still being pushed to the PC)
• If I go to Developer Options->Running Services & kill it, changes still get synced to the PC
• Even if I use SwiftBackup to “Disable” it, changes still get synced to the PC

It seems like the only way to actually get it to stop is to go to the web UI, Actions->Shutdown, then go back out to the app & “Exit.” Anything short of explicitly visiting the Web UI seems to leave SyncThing silently syncing in the background.

The issue does not occur when not running as root: the moment you exit the SyncThing app, it will stop syncing, as expected.

See for further discussion: https://forum.syncthing.net/t/syncthing-as-superuser-never-actually-exits/19575

Version Information

App Version: 1.22.2
Syncthing Version: 1.22.2
Android Version: Android 12