[Pkg-nagios-devel] Bug#800345: check_disk sees wrong disk consumption on btrfs

[Klaus Ethgen]

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Package: monitoring-plugins-basic
Version: 2.1.1-1
Severity: normal

Since several days, one of my checks went red for one of my boxes,
mentioned that / is 100% full. But this is not true, there is plenty of
space left.

   ~> df -Th
   Filesystem               Type      Size  Used Avail Use% Mounted on
   /dev/sda1                btrfs     502M  338M  169M  67% /
   ...

   ~> btrfs fi df /
   System, single: total=4.00MiB, used=4.00KiB
   Data+Metadata, single: total=497.81MiB, used=329.71MiB
   GlobalReserve, single: total=8.00MiB, used=0.00B

   ~> /usr/lib/nagios/plugins/check_disk -w '3%' -c '1%'
   DISK CRITICAL - free space: / 0 MB (0% inode=-)]; ...

   ~> grep ' / ' /proc/mounts
   /dev/sda1 / btrfs rw,nodiratime,relatime,compress=zlib,ssd,discard,space_cache,autodefrag 0 0

All other partitions worked well but it constantly shows / to be full.

- -- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (800, 'unstable'), (500, 'testing'), (110, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.7 (SMP w/8 CPU cores)
Locale: LANG=de_DE, LC_CTYPE=de_DE (charmap=ISO-8859-1) (ignored: LC_ALL set to de_DE)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages monitoring-plugins-basic depends on:
ii  iputils-ping               3:20121221-5+b2
ii  libc6                      2.19-22
ii  libssl1.0.0                1.0.2d-1
ii  monitoring-plugins-common  2.1.1-1
ii  procps                     2:3.3.10-4
ii  ucf                        3.0030

Versions of packages monitoring-plugins-basic recommends:
ii  libcap2-bin  1:2.24-11

Versions of packages monitoring-plugins-basic suggests:
pn  icinga | icinga | nagios3  <none>

- -- no debconf information

- -- 
Klaus Ethgen                              http://www.ethgen.ch/
pub  4096R/4E20AF1C 2011-05-16   Klaus Ethgen <Klaus at Ethgen.de>
Fingerprint: 85D4 CA42 952C 949B 1753  62B3 79D0 B06F 4E20 AF1C
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