[Bug 1637116] [NEW] all journalctl logs their "Log begin" decrease

[Jonas Libbrecht]

Public bug reported:

Every night we setup 3 ubuntu 16.04 environments and we test our software on it.
This morning something weird caught my eye while debugging our software.

On 1 of the 3 machines I tried to search logging of the day before but I
could not find any.

When I first looked at a journalctl unit log of process `x` (for example), I saw the logs started at:
`-- Logs begin at Thu 2016-10-27 05:18:01 CEST, end at Thu 2016-10-27 10:22:37 CEST. --`
I found this very weird because the logs should have started around `Wed 2016-10-26 22:00:00 CEST`

After some time I looked again at the journalctl unit log of process `x` but this time the logs started @:
`-- Logs begin at Thu 2016-10-27 06:04:31 CEST, end at Thu 2016-10-27 10:29:31 CEST. --`

I've checked if the nodes were rebooted, ntp was misconfigured or maybe
the disk was full but I could not find anything.

This affects the whole system, so its not a certain process in
particular.

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


** Tags: journalctl

** Description changed:

- Every night we setup 3 ubuntu 16.04 environments are perform some testing on it.
+ Every night we setup 3 ubuntu 16.04 environments and we test our software on it.
  This morning something weird caught my eye while debugging our software.
  
  On 1 of the 3 machines I tried to search logging of the day before but I
  could not find any.
  
  When I first looked at a journalctl unit log of process `x` (for example), I saw the logs started at:
  `-- Logs begin at Thu 2016-10-27 05:18:01 CEST, end at Thu 2016-10-27 10:22:37 CEST. --`
  I found this very weird because the logs should have started around `Wed 2016-10-26 22:00:00 CEST`
  
  After some time I looked again at the journalctl unit log of process `x` but this time the logs started @:
  `-- Logs begin at Thu 2016-10-27 06:04:31 CEST, end at Thu 2016-10-27 10:29:31 CEST. --`
  
  I've checked if the nodes were rebooted, ntp was misconfigured or maybe
  the disk was full but I could not find anything.
  
  This affects the whole system, so its not a certain process in
  particular.

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https://bugs.launchpad.net/bugs/1637116

Title:
  all journalctl logs their "Log begin" decrease

Status in systemd package in Ubuntu:
  New

Bug description:
  Every night we setup 3 ubuntu 16.04 environments and we test our software on it.
  This morning something weird caught my eye while debugging our software.

  On 1 of the 3 machines I tried to search logging of the day before but
  I could not find any.

  When I first looked at a journalctl unit log of process `x` (for example), I saw the logs started at:
  `-- Logs begin at Thu 2016-10-27 05:18:01 CEST, end at Thu 2016-10-27 10:22:37 CEST. --`
  I found this very weird because the logs should have started around `Wed 2016-10-26 22:00:00 CEST`

  After some time I looked again at the journalctl unit log of process `x` but this time the logs started @:
  `-- Logs begin at Thu 2016-10-27 06:04:31 CEST, end at Thu 2016-10-27 10:29:31 CEST. --`

  I've checked if the nodes were rebooted, ntp was misconfigured or
  maybe the disk was full but I could not find anything.

  This affects the whole system, so its not a certain process in
  particular.

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