Ubuntu
bash package

clear_console locks up video when X is running and you log out from a plain text console

Bug #1822184 reported by Quesar on 2019-03-28

This bug affects 2 people

	Status	Importance	Assigned to
X.Org X server	New	Unknown	auto-gitlab.freedesktop.org-xorg-xserver #492
bash (Ubuntu)	Fix Released	Undecided	Unassigned
xorg (Debian)	New	Unknown	debbugs #866898
xorg-server (Debian)	Fix Released	Unknown	debbugs #810660
xorg-server (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

References:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810660
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=866898

If X is running and you switch to a plain text console (ie ctrl-alt-f3), log in as a regular user, and then log out, the display switches back to the graphical login screen and locks up. The system is still functioning (can ssh in, etc) but the video output is frozen.

The underlying cause is: https://gitlab.freedesktop.org/xorg/xserver/issues/492

However, the problem can at least be worked around by making clear_console switch to tty 6 and back instead of switching to 1 and back. This patch corrects the problem:

--- bash-4.4.18.orig/debian/clear_console.c 2019-03-28 12:09:02.415907787 -0400
+++ bash-4.4.18/debian/clear_console.c 2019-03-28 12:08:11.984366858 -0400
@@ -205,7 +205,7 @@
#if defined(__linux__)
num = vtstat.v_active;
#endif
- tmp_num = (num == 1 ? 2 : 1);
+ tmp_num = (num == 6 ? 5 : 6);

/* switch vt to clear the scrollback buffer */
if (ioctl(fd, VT_ACTIVATE, tmp_num))

Tags:

Revision history for this message

Quesar (rick-microway) wrote on 2019-03-28:

makes clear_console switch to either tty6 or tty5 instead of tty1/tty2 Edit (391 bytes, text/plain)

Revision history for this message

Ubuntu Foundations Team Bug Bot (crichton) wrote on 2019-03-28:

The attachment "makes clear_console switch to either tty6 or tty5 instead of tty1/tty2" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags:

added: patch

Revision history for this message

Launchpad Janitor (janitor) wrote on 2019-03-29:

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

Changed in bash (Ubuntu):
status:	New → Confirmed

Daniel van Vugt (vanvugt) on 2019-03-29

Changed in bash (Ubuntu):
status:	Confirmed → Opinion
Changed in xorg-server (Ubuntu):
status:	New → Confirmed

Bug Watch Updater (bug-watch-updater) on 2019-03-29

Changed in xorg-server (Debian):
status:	Unknown → Confirmed
Changed in xorg (Debian):
status:	Unknown → New

Bug Watch Updater (bug-watch-updater) on 2019-03-29

Changed in xorg-server:
status:	Unknown → New

Revision history for this message

Launchpad Janitor (janitor) wrote on 2019-04-04:

This bug was fixed in the package bash - 5.0-3ubuntu1

---------------
bash (5.0-3ubuntu1) disco; urgency=medium

  * Merge with Debian; remaining changes:
    - skel.bashrc:
      - Run lesspipe.
      - Enable ls aliases.
      - Set options in ll alias to -alF.
      - Define an alert alias.
      - Enabled colored grep aliases.
    - etc.bash.bashrc:
      - Add sudo hint.

bash (5.0-3) unstable; urgency=medium

  * Apply upstream patch 003.
  * Fix clear_console locking up video when X is running and logging out
    from a plain text console. Closes: #810660. LP: #1822184.

-- Matthias Klose <email address hidden> Thu, 04 Apr 2019 05:11:47 +0200