Description of problem: Logging out and back in does not re-load the user's groups. Version-Release number of selected component (if applicable): gdm-3.22.3-1.fc25.x86_64 How reproducible: I tried several times, including with either X session or Wayland, all attempts had this problem. Steps to Reproduce: 1. addgroup testgroup 2. usermod -a -G testgroup $USER 3. id -a $USER 4. log out of GNOME session 5. log in to GNOME again (using gdm) 6. id -a Actual results: uid=1000(alan-sysop) gid=1000(alan-sysop) groups=1000(alan-sysop),10(wheel),1003(testgroup) uid=1000(alan-sysop) gid=1000(alan-sysop) groups=1000(alan-sysop),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 Expected results: The groups in the output of `id -a $USER` and `id -a` should be the same, after logging out and back in again. Additional info: This is not 100% documented... the Fedora System Adminstrator's Guide doesn't mention *any* method to re-load groups, implying that they take effect immediately. However the behaviour is widely expected, e.g. https://unix.stackexchange.com/a/11573/29483
Rebooting gets the groups reloaded OK. Originally I tried to restart gdm (while I was still logged in) - I know this forcibly logs you out. But for a while now this ends up with the screen constantly flickering, gdm seems to fail in a loop with "(WW) xf86OpenConsole: VT_ACTIVATE failed: Operation not permitted". So I was not able to test this.
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Appears fixed in F26, yay!