[Bug 1819369] [NEW] When specifying minute, hour, day-of-month, month, day-of-week values/ranges, given day-of-month range is *ignored*

[Markus Ueberall]

Public bug reported:

1) The release of Ubuntu you are using, via 'lsb_release -rd'
# lsb_release -rd
Description:    Ubuntu 16.04.6 LTS
Release:        16.04

2) The version of the package you are using, via 'apt-cache policy pkgname'
# apt-cache policy cron
cron:
  Installed: 3.0pl1-128ubuntu2
  Candidate: 3.0pl1-128ubuntu2
  Version table:
 *** 3.0pl1-128ubuntu2 500
        500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

3) What you expected to happen
/etc/crontab contains the following entries (each line lives on a separate host with identical setup, system clocks are in sync):
# m h dom mon dow user  command
00 05 1-7 1,3,5,7,9,11 SAT      sys-maint       some-task some-option   #host1
00 05 8-14 1,3,5,7,9,11 SAT     sys-maint       some-task some-option   #host2
00 05 15-21 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host3
00 05 22-28 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host4

The expectation was that none of the entries is executed in parallel at
any given point in time due to column three (date of month range).
(Note: All other (default) entries work as expected, syntax of all
crontab files has been checked using
https://code.google.com/archive/p/chkcrontab/wikis/CheckCrontab.wiki)

4) What happened instead
Yesterday (Saturday, March 9th), the same script was executed in parallel on all four hosts.

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

** Description changed:

  1) The release of Ubuntu you are using, via 'lsb_release -rd'
  # lsb_release -rd
  Description:    Ubuntu 16.04.6 LTS
  Release:        16.04
  
- 
  2) The version of the package you are using, via 'apt-cache policy pkgname'
  # apt-cache policy cron
  cron:
-   Installed: 3.0pl1-128ubuntu2
-   Candidate: 3.0pl1-128ubuntu2
-   Version table:
-  *** 3.0pl1-128ubuntu2 500
-         500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
-         100 /var/lib/dpkg/status
- 
+   Installed: 3.0pl1-128ubuntu2
+   Candidate: 3.0pl1-128ubuntu2
+   Version table:
+  *** 3.0pl1-128ubuntu2 500
+         500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
  
  3) What you expected to happen
  /etc/crontab contains the following entries (each line lives on a separate host with identical setup, system clocks are in sync):
  # m h dom mon dow user  command
  00 05 1-7 1,3,5,7,9,11 SAT      sys-maint       some-task some-option   #host1
  00 05 8-14 1,3,5,7,9,11 SAT     sys-maint       some-task some-option   #host2
  00 05 15-21 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host3
  00 05 22-28 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host4
  
  The expectation was that none of the entries is executed in parallel at
  any given point in time due to column three (date of month range).
  (Note: All other (default) entries work as expected, syntax of all
- crontab files have been checked using
+ crontab files has been checked using
  https://code.google.com/archive/p/chkcrontab/wikis/CheckCrontab.wiki)
- 
  
  4) What happened instead
  Yesterday (Saturday, March 9th), the same script was executed in parallel on all four hosts.

** Summary changed:

- When specifying specific minute,hour,day-of-month,month,day-of-week values/ranges, given day-of-month range is *ignored*
+ When specifying minute,hour,day-of-month,month,day-of-week values/ranges, given day-of-month range is *ignored*

-- 
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Foundations Bugs, which is subscribed to cron in Ubuntu.
https://bugs.launchpad.net/bugs/1819369

Title:
  When specifying minute,hour,day-of-month,month,day-of-week
  values/ranges, given day-of-month range is *ignored*

Status in cron package in Ubuntu:
  New

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd'
  # lsb_release -rd
  Description:    Ubuntu 16.04.6 LTS
  Release:        16.04

  2) The version of the package you are using, via 'apt-cache policy pkgname'
  # apt-cache policy cron
  cron:
    Installed: 3.0pl1-128ubuntu2
    Candidate: 3.0pl1-128ubuntu2
    Version table:
   *** 3.0pl1-128ubuntu2 500
          500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  /etc/crontab contains the following entries (each line lives on a separate host with identical setup, system clocks are in sync):
  # m h dom mon dow user  command
  00 05 1-7 1,3,5,7,9,11 SAT      sys-maint       some-task some-option   #host1
  00 05 8-14 1,3,5,7,9,11 SAT     sys-maint       some-task some-option   #host2
  00 05 15-21 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host3
  00 05 22-28 1,3,5,7,9,11 SAT    sys-maint       some-task some-option   #host4

  The expectation was that none of the entries is executed in parallel
  at any given point in time due to column three (date of month range).
  (Note: All other (default) entries work as expected, syntax of all
  crontab files has been checked using
  https://code.google.com/archive/p/chkcrontab/wikis/CheckCrontab.wiki)

  4) What happened instead
  Yesterday (Saturday, March 9th), the same script was executed in parallel on all four hosts.

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