Public bug reported: [Description] If PAM session fails to initialize completely, the session aborts as expected but GDM stays on VT1 and switches to a black screen. This is the case for example, when requirement to start a session are not met and the session start up has to be aborted.
[Test Plan] 1. In /etc/pam.d/gdm-password insert the line: session requisite pam_deny.so After the line @include common-account 2. Login from GDM 3. Verify that: - The session fails to start - A black TTY is displayed - Active TTY is 1 4. Apply the patched version 5. Login from GDM 6. Verify the login fails but GDM is still displayed and an error message in printed under the password box. [Where problem could occur] * Cannot login at all with any user. [Other info] * Upstream bug report and patch: https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/143 ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: gdm3 3.38.2.1-3ubuntu2 ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21 Uname: Linux 5.11.0-20-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu67 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Mon Jul 12 11:36:11 2021 InstallationDate: Installed on 2020-05-31 (407 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200527) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: gdm3 (Ubuntu) Importance: High Status: Triaged ** Affects: gdm3 (Ubuntu Focal) Importance: Undecided Assignee: Jean-Baptiste Lallement (jibel) Status: New ** Tags: amd64 apport-bug impish ** Description changed: [Description] If PAM session fails to initialize completely, the session aborts as expected but GDM stays on VT1 and switches to a black screen. [Test Plan] 1. In /etc/pam.d/gdm-password insert the line: - session requisite pam_deny.so - After the line - @include common-account - 2. Login from GDM + session requisite pam_deny.so + After the line + @include common-account + 2. Login from GDM 3. Verify that: - - The session fails to start - - A black TTY is displayed - - Active TTY is 1 + - The session fails to start + - A black TTY is displayed + - Active TTY is 1 4. Apply the patched version - 5. Login from GDM + 5. Login from GDM 6. Verify the login fails but GDM is still displayed and an error message in printed under the password box. [Where problem could occur] * Cannot login at all with any user. [Other info] + * Upstream bug report and patch: + https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/143 ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: gdm3 3.38.2.1-3ubuntu2 ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21 Uname: Linux 5.11.0-20-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu67 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Mon Jul 12 11:36:11 2021 InstallationDate: Installed on 2020-05-31 (407 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200527) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) ** Also affects: gdm3 (Ubuntu Focal) Importance: Undecided Status: New ** Changed in: gdm3 (Ubuntu) Importance: Undecided => High ** Changed in: gdm3 (Ubuntu) Status: New => Triaged ** Description changed: [Description] - If PAM session fails to initialize completely, the session aborts as expected but GDM stays on VT1 and switches to a black screen. + If PAM session fails to initialize completely, the session aborts as expected but GDM stays on VT1 and switches to a black screen. This is the case for example, when requirement to start a session are not met and the session start up has to be aborted. [Test Plan] 1. In /etc/pam.d/gdm-password insert the line: session requisite pam_deny.so After the line @include common-account 2. Login from GDM 3. Verify that: - The session fails to start - A black TTY is displayed - Active TTY is 1 4. Apply the patched version 5. Login from GDM 6. Verify the login fails but GDM is still displayed and an error message in printed under the password box. [Where problem could occur] * Cannot login at all with any user. [Other info] * Upstream bug report and patch: - https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/143 + https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/143 ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: gdm3 3.38.2.1-3ubuntu2 ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21 Uname: Linux 5.11.0-20-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu67 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Mon Jul 12 11:36:11 2021 InstallationDate: Installed on 2020-05-31 (407 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200527) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) ** Changed in: gdm3 (Ubuntu Focal) Assignee: (unassigned) => Jean-Baptiste Lallement (jibel) ** Changed in: gdm3 (Ubuntu Focal) Milestone: None => ubuntu-20.04.3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1935818 Title: Black screen if PAM session fails to initialize completely To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1935818/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
