vault crashed without any interaction with user

[Dariusz Smigiel]

I deployed OpenStack using juju, via [openstack bundle][3]

The Cloud has been working for couple days. It's been deployed: 2021-03-09 21:23:17
No activity was happening for last couple days.

When I looked at `juju status` around 2021-03-11 15:46:38 I found out that `juju status` is reporting error on `vault/0` unit.
```
vault/0* error idle 24 10.5.0.14 8200/tcp hook failed: "update-status"
  vault-mysql-router/0* active idle 10.5.0.14 Unit is ready
```

Please see attached [logs][1] from `/var/log/juju/unit-vault-0.log`. The event which caused outage started around 2021-03-11 03:47:20

At first I suspected autoupdate problem, but it doesn't seem to be [the case][2].

The issue has been fixed by running `juju resolved vault/0`

When I went through `/var/log/syslog` for `vault/0` I noticed possible [culprit][4]

Deployed with:
```
ubuntu@smigiel-dariusz-bastion:~$ juju version
2.8.9-bionic-amd64
ubuntu@smigiel-dariusz-bastion:~$ juju ssh vault/0 lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
Connection to 10.5.0.14 closed.
ubuntu@smigiel-dariusz-bastion:~$ juju ssh nova-compute/0 nova-manage --version
22.0.1
```

[1]: https://paste.ubuntu.com/p/RksTmRCpCW/
[2]: https://paste.ubuntu.com/p/FcnvN7QZfN/
[3]: https://github.com/openstack-charmers/openstack-bundles/blob/master/stable/openstack-base/bundle.yaml
[4]: https://paste.ubuntu.com/p/C3zxd2pmpc/

[David Ames (thedac)]

This is not a juju bug. It may or may not be a vault charm bug. We need more information to determine that.

A jujucrashdump would be helpful

[Dariusz Smigiel (smigiel-dariusz)]

Marking as invalid. I neither can reproduce this error nor provide crashdump.
I believe I misunderstood what happened here.

[Dariusz Smigiel (smigiel-dariusz)]

I've noticed this bug again. This time I tracked down the source of this bug. Bugfix for it has been released already as #1886083 and is part of `master` branch.
I'm using latest/stable version == 21.01.

21.01:
https://github.com/openstack/charm-vault/blob/stable/21.01/src/reactive/vault_handlers.py#L793
master:
https://github.com/openstack/charm-vault/blob/master/src/reactive/vault_handlers.py#L806