The lock screen text box didn't mask the password I typed

[Muhammad Gelbana]

My laptop was charging, I left it for like an hour so the screen lock kicked in. When I tried to unlock it, I found that my typed password was not masked !!

I expect it to be masked of course. I erased what I typed and typed other random characters so I can take a picture and share it safely.

$ lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

$ apt-cache policy gnome-screensaver
gnome-screensaver:
  Installed: 3.6.1-8ubuntu3
  Candidate: 3.6.1-8ubuntu3
  Version table:
 *** 3.6.1-8ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-screensaver 3.6.1-8ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 9 15:02:32 2018
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
InstallationDate: Installed on 2018-07-04 (66 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jonathan Kamens (jik)]

I think there might be a race condition involved here, i.e., I think this behavior only happens if you start typing your password at the "wrong time" while the computer is in the process of waking up from sleep.

Note that if you click the Cancel button and then try unlocking your screen again, the password is properly masked.

I've unlocked my screen many times after waking my computer from sleep, but I've only seen this happen once.