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[Eric Lacroix <1843036@xxxxxxxxxxxxxxxxxx>]

** Changed in: net-snmp (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1843036

Title:
  [regression] SNMP missing disks in hrStorageTable

Status in net-snmp package in Ubuntu:
  Fix Released
Status in net-snmp source package in Xenial:
  Fix Committed
Status in net-snmp source package in Bionic:
  Fix Released
Status in net-snmp source package in Disco:
  Fix Committed
Status in net-snmp source package in Eoan:
  Fix Released

Bug description:
  [IMPACT]

  It has been brought to me the following:

  Some hosts have started to cause UNKNOWN return values in Nagios for
  checks on their disks. This is because these hosts are no longer
  reporting their disks as part of the SNMP table hrStorageTable
  (1.3.6.1.2.1.25.2.3.1 ) - only memory devices are being reported. The
  affected hosts that I have investigated received updates for SNMP:

  Upgrade package libsnmp-base 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2
  Upgrade package libsnmp30 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2
  Upgrade package snmpd 5.7.3+dfsg-1.8ubuntu3.1 to 5.7.3+dfsg-1.8ubuntu3.2

  It seems likely that this package update is the cause.

  As debug info, you can see the difference between 2 nearly identical
  servers, one of which received the SNMP updates, and one which did
  not. You can see that the one without the update is returning disks in
  the SNMP output:

  # snmpwalk -v2c -cpublic arcprsmt01 1.3.6.1.2.1.25.2.3.1.3
  iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
  iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
  iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
  iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
  iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
  iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"
  iso.3.6.1.2.1.25.2.3.1.3.31 = STRING: "/"
  iso.3.6.1.2.1.25.2.3.1.3.37 = STRING: "/run"
  iso.3.6.1.2.1.25.2.3.1.3.39 = STRING: "/dev/shm"
  iso.3.6.1.2.1.25.2.3.1.3.40 = STRING: "/run/lock"
  iso.3.6.1.2.1.25.2.3.1.3.41 = STRING: "/sys/fs/cgroup"
  iso.3.6.1.2.1.25.2.3.1.3.67 = STRING: "/run/snapd/ns"
  iso.3.6.1.2.1.25.2.3.1.3.70 = STRING: "/var/lib/docker/containers/3cad3d36991b677c37b08b374a7bfeceddf36a6b6754edaa1ff687b00111a6b8/mounts/shm"
  iso.3.6.1.2.1.25.2.3.1.3.73 = STRING: "/var/lib/docker/containers/c605c4b76dea65d562ba024212a38e24fb710186c499187b6604478b7ff678e9/mounts/shm"
  iso.3.6.1.2.1.25.2.3.1.3.82 = STRING: "/run/user/2002"
  iso.3.6.1.2.1.25.2.3.1.3.253 = STRING: "/var/lib/docker/containers/dc74a157fbaaa284e0e5b8ca4afc88769bf625eb796d89a5d26f98a540cabf35/mounts/shm"
  iso.3.6.1.2.1.25.2.3.1.3.256 = STRING: "/var/lib/docker/containers/6ce6193433f9c1c95cccbfbbe08a3f3385bdbc4f2e3f0baa02d11baf3866dfd2/mounts/shm"
  iso.3.6.1.2.1.25.2.3.1.3.258 = STRING: "/run/user/1000"

  The other, which received SNMP updates, is returning only memory
  devices, such as swap and shmem:

  # snmpwalk -v2c -cpublic arcprsmt02 1.3.6.1.2.1.25.2.3.1.3
  iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
  iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
  iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
  iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
  iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
  iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"

  [Test Case]

  * Install snmp snmpd
  * Configure /etc/snmp/snmpd.conf by adding the following:
   view   systemonly  included   .1.3.6.1.2.1.25.2.3.1.3
  * Restart snmpd
  * Use snmpwalk:
   ** snmpwalk -v2c -cpublic localhost 1.3.6.1.2.1.25.2.3.1.3

  Expected behavior is to see the disk as follow:
  "
  iso.3.6.1.2.1.25.2.3.1.3.1 = STRING: "Physical memory"
  iso.3.6.1.2.1.25.2.3.1.3.3 = STRING: "Virtual memory"
  iso.3.6.1.2.1.25.2.3.1.3.6 = STRING: "Memory buffers"
  iso.3.6.1.2.1.25.2.3.1.3.7 = STRING: "Cached memory"
  iso.3.6.1.2.1.25.2.3.1.3.8 = STRING: "Shared memory"
  iso.3.6.1.2.1.25.2.3.1.3.10 = STRING: "Swap space"
  iso.3.6.1.2.1.25.2.3.1.3.31 = STRING: "/"
  iso.3.6.1.2.1.25.2.3.1.3.33 = STRING: "/dev"
  iso.3.6.1.2.1.25.2.3.1.3.45 = STRING: "/dev/lxd"
  iso.3.6.1.2.1.25.2.3.1.3.46 = STRING: "/dev/.lxd-mounts"
  iso.3.6.1.2.1.25.2.3.1.3.63 = STRING: "/proc/sys/kernel/random/boot_id"
  iso.3.6.1.2.1.25.2.3.1.3.66 = STRING: "/dev/shm"
  iso.3.6.1.2.1.25.2.3.1.3.67 = STRING: "/run"
  iso.3.6.1.2.1.25.2.3.1.3.68 = STRING: "/run/lock"
  iso.3.6.1.2.1.25.2.3.1.3.69 = STRING: "/sys/fs/cgroup"
  "

  [Potential Regression]
  The fix has been tested by various impacted users (+/- 10 different impacted users), and feedback were all positives (see comments below). 

  Note that this fix a regression introduced by:
  https://bugs.launchpad.net/bugs/1835818

  [Other information]

  # Upstream commit:
  https://github.com/net-snmp/net-snmp/commit/71e487212bd65839e7454df9701524d08cf0d74f
  https://github.com/net-snmp/net-snmp/commit/bcb1a6b8afc444bbcd099a195e08f0b01cbc8f6b

  # git describe --contains 71e487212bd65839e7454df9701524d08cf0d74f
  v5.8.pre1

  # rmadison:
   net-snmp | 5.7.3+dfsg-1ubuntu4     | xenial           | source
   net-snmp | 5.7.3+dfsg-1ubuntu4.2   | xenial-security  | source
   net-snmp | 5.7.3+dfsg-1ubuntu4.2   | xenial-updates   | source
   net-snmp | 5.7.3+dfsg-1ubuntu4.3   | xenial-proposed  | source
   net-snmp | 5.7.3+dfsg-1.8ubuntu3   | bionic           | source
   net-snmp | 5.7.3+dfsg-1.8ubuntu3.1 | bionic-security  | source
   net-snmp | 5.7.3+dfsg-1.8ubuntu3.1 | bionic-updates   | source
   net-snmp | 5.7.3+dfsg-1.8ubuntu3.2 | bionic-proposed  | source
   net-snmp | 5.7.3+dfsg-5ubuntu1     | disco            | source
   net-snmp | 5.7.3+dfsg-5ubuntu1.1   | disco-proposed   | source
   net-snmp | 5.7.3+dfsg-5ubuntu3     | eoan             | source

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