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[Bryce Harrington <1516451@xxxxxxxxxxxxxxxxxx>]

This looks similar to https://bugs.launchpad.net/ubuntu/+source
/monitoring-plugins/+bug/1827159.

However, installing nagios-plugins in a fresh Xenial LXC container does
not appear sufficient to reproduce the bug:

1.  There is no /sys/kernel/debug/tracing present on the system.  Installing perf-tools-unstable caused the directory to be created.
2.  There is not a nagios user on the system.  I created this manually, but wonder if there is some third component that should be installed, that would create this?
3.  The directory in question is owned by 'nobody':
    root@triage-xenial:~# ls -l /sys/kernel/debug/tracing
    ls: cannot access '/sys/kernel/debug/tracing': Permission denied
    root@triage-xenial:~# ls -l /sys/kernel
    (...)
    drwx------  36 nobody nogroup    0 Jul 10 23:10 debug
    (...)

It would be quite helpful to have a step-by-step test case that can be
invoked in a Xenial lxc container.

Has anyone checked that this same issue affects bionic or newer, or is
Xenial-specific?


** Changed in: nagios-plugins (Ubuntu)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1516451

Title:
  check_disk plugin broken after upgrade to 15.10

Status in nagios-plugins package in Ubuntu:
  Incomplete

Bug description:
  I didn't touch my Nagios config, just update my system from 15.04 to
  15.10. Suddenly the default localhost/Disk Space check fails with the
  following output:

  DISK CRITICAL - /sys/kernel/debug/tracing is not accessible:
  Permission denied

  This can be reproduced when manually running the underlying command as
  user "nagios":

  $ /usr/lib/nagios/plugins/check_disk -w '20%' -c '10%' -e
  DISK CRITICAL - /sys/kernel/debug/tracing is not accessible: Permission denied

  When I run it as root it works:

  # /usr/lib/nagios/plugins/check_disk -w '20%' -c '10%' -e
  DISK OK| /dev=0MB;1186;1334;0;1483 /run=8MB;239;269;0;299 /=17157MB;57386;64559;0;71733 /dev/shm=0MB;1199;1349;0;1499 /run/lock=0MB;4;4;0;5 /sys/fs/cgroup=0MB;1199;1349;0;1499 /boot=48MB;181;204;0;227 /run/user/0=0MB;239;269;0;299

  Seems "nagios" user can't access the dir it tries to access:

  # ls -la /sys/kernel/debug/tracing
  drwx------  7 root root 0 Nov 15 19:40 .

  # lsb_release -rd
  Description:    Ubuntu 15.10
  Release:        15.10

  # apt-cache policy nagios-plugins-basic
  nagios-plugins-basic:
    Installed: 1.5-3ubuntu1
    Candidate: 1.5-3ubuntu1
    Version table:
   *** 1.5-3ubuntu1 0
          500 http://de.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

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