** Description changed: - WORKAROUND: After typing an incorrect password, click Cancel, then click - your name, then enter your password again. + [ Description ] + + Due to a refcounting bug, a GDBusConnection was getting disposed when it + was still required. The symptom of this was that you couldn't log in if + you'd got your password wrong. + + [ Test case ] + + 1. Boot to GDM + 2. Click your username + 3. Type the wrong password a couple of times, pressing enter after each time + 4. Type the right password + + If the bug is happening, after 4. the system hangs at a blank screen + with the mouse cursor. If you then switch to a VT or otherwise connect + to the machine, you can examine the journal and you'll see a + G_IS_DBUS_CONNECTION failure. + + [ Fix ] + + Marco and I worked upstream on this fix. We found out that there was a + problem like this- + + The GdmClient has a shared GDBusConnection for its operations. The first + time someone calls for it, it is created and stored in the object's + private structure. Subsequent calls return *a new reference* to this + same object. It turned out that the asynchronous method to get the + connection was accidentally unreferencing its object before giving it to + the caller if it was returning an already-existing connection. + + For this to work properly, we need to nullify the pointer we stored when + the connection goes away, so we know when to make a new one. There were + some cases where we didn't add the weak references required to do that. + Those are also fixed. + + [ Regression potential ] + + Now we share connections more than we did before. We also more carefully + track when to clear our object. If we got this wrong, we might end up + leaking the connection or dropping it in even more cases. + + [ Original report ] + + + WORKAROUND: After typing an incorrect password, click Cancel, then click your name, then enter your password again. --- Trying to log into my session (Gnome, Xorg), if I enter the wrong password before entering it correctly, the session doesn't load and I get a purple screen, a mouse cursor, and an invisible but clickable menu in the top right. If I enter it correctly the first time, there is no problem. I've replicated this from a fresh boot, after logging out and after 'sudo service gdm restart' from the Ctrl-Alt-F4 console. This is a fresh install, and didn't occur when I was using a previous install of 18.04 (until Friday). ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gdm3 3.28.0-0ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 Uname: Linux 4.15.0-15-generic x86_64 ApportVersion: 2.20.9-0ubuntu6 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Apr 22 20:31:13 2018 InstallationDate: Installed on 2018-04-22 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180421.1) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766137 Title: [regression] Password accepted but login fails (blank purple screen and mouse pointer only) To manage notifications about this bug go to: https://bugs.launchpad.net/gdm/+bug/1766137/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
