[Bug 1923472] [NEW] xdm fails to start on Sundays

[Michael Rutter]

Public bug reported:

On the first login of the week, xdm (1.1.11-3ubuntu2) fails to start on
Ubuntu 20.04.

More correctly, it does start, but exits almost immediately on signal
12. It leaves /var/run/xdm.pid behind, and also a running X server with
no clients. This makes it hard to restart, for one needs to kill the X
server and remove the pid file first.

The cause is logrotate running during startup and killing xdm before xdm
installs a handler for SIGUSR2. The issue is more fully described
upstream at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948346

In passing I would comment that running logrotate so early during
startup seems strange to me. Startup would surely be faster if these
sort of "cron" jobs were left until it had finished?

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  xdm fails to start on Sundays

Status in systemd package in Ubuntu:
  New

Bug description:
  On the first login of the week, xdm (1.1.11-3ubuntu2) fails to start
  on Ubuntu 20.04.

  More correctly, it does start, but exits almost immediately on signal
  12. It leaves /var/run/xdm.pid behind, and also a running X server
  with no clients. This makes it hard to restart, for one needs to kill
  the X server and remove the pid file first.

  The cause is logrotate running during startup and killing xdm before
  xdm installs a handler for SIGUSR2. The issue is more fully described
  upstream at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948346

  In passing I would comment that running logrotate so early during
  startup seems strange to me. Startup would surely be faster if these
  sort of "cron" jobs were left until it had finished?

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