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[Mauricio Faria de Oliveira <1999816@xxxxxxxxxxxxxxxxxx>]

Steps to Reproduce
---

lxc launch ubuntu:focal rmq-focal
lxc exec rmq-focal -- su - ubuntu

sudo apt install --yes rabbitmq-server

$ sudo rabbitmqctl status | grep -i disk
Free Disk Space
Low free disk space watermark: 0.05 gb
Free disk space: 327.7867 gb

DF=$(which df)
SH=/tmp/df.sh

cat <<EOF >$SH
#!/bin/sh
sleep 5m
EOF

sudo chmod +x $SH
sudo mount --bind $SH $DF

$ sudo rabbitmqctl status
Status of node rabbit@rmq-focal ...
<... DELAY ...>
Error:
{{:unparseable, []}, {:gen_server, :call, [:rabbit_disk_monitor, :get_disk_free_limit, :infinity]}}

sudo kill $(pidof sleep)
sudo umount $DF
rm $SH

For doc purposes, the chain from rabbitmq-server to the df (sleep)
command:

$ ps axf | sed -n '/rabbitmq-server$/,/sleep/p'
   1973 ?        Ss     0:00 /bin/sh /usr/sbin/rabbitmq-server
   1977 ?        Sl     0:31  \_ /usr/lib/erlang/erts-10.6.4/bin/beam.smp ...
   2244 ?        Ss     0:00      \_ erl_child_setup 65536
   2273 ?        Ss     0:00          \_ inet_gethost 4
   2274 ?        S      0:00          |   \_ inet_gethost 4
   4237 ?        Ss     0:00          \_ /bin/sh -s unix:cmd
   4238 ?        S      0:00              \_ /bin/sh /usr/bin/df -kP /var/lib/rabbitmq/mnesia/rabbit@rmq-focal
   4239 ?        S      0:00                  \_ sleep 5m

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https://bugs.launchpad.net/bugs/1999816

Title:
  Failure to get free disk space breaks "rabbitmqctl status" command

Status in rabbitmq-server package in Ubuntu:
  Fix Released
Status in rabbitmq-server source package in Focal:
  Triaged
Status in rabbitmq-server source package in Jammy:
  Triaged
Status in rabbitmq-server source package in Kinetic:
  Triaged

Bug description:
  [Impact]

  When for some reason the df command fails to get the disk free space
  (for example timeout on a heavily loaded system) the result is a
  harcoded value of "unknown". As this is not a valid number this
  generates arithmetic errors when the "rabbitmqctl status" command is
  run and tries to divide that value to convert it to another unit.

  This has been fixed upstream here:
  https://github.com/rabbitmq/rabbitmq-server/pull/4897

  [Test Plan]

  The df command can be linked to another file that just waits for a few
  minutes to force a timeout for example: [detailed steps in comment
  #5].

  #!/bin/bash
  sleep 5m

  After the timeout occurs the "rabbitmqctl status" returns an error
  with the unpatched version. After the patch it shows all the
  information and displays unknown in the free space line.

  [Where problems could occur]

  The patch just changes the display of information, it should not break
  anything in the core operations of the package

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