[Bug 286179] Passing a vlan interface to a vnet jail result in a stuck dying state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286179

--- Comment #24 from Zhenlei Huang <[email protected]> ---
(In reply to florian.millet from comment #10)
> I tried to add a new exec.prestop step before the zfs unjail one with a
> "zfs umount -f zdata/jails-data/${name}" but I still ended up with a stuck
> un dying jail.
> I also tried on the host to do the zfs umount -f when the jail is stuck but it
> didn't change anything.

No. `zfs umount` should run in the jail but not in the host, since `zfs jail`
makes the jail to manage the dataset.

`exec.prestop` runs in the host ( system ) environment. Try this,

```
# diff jail.conf jail2.conf 
2c2,3
<     exec.start = "/bin/sh /etc/rc";
---
>     exec.start = "/sbin/zfs mount zroot/jails-data/${name}";
>     exec.start += "/bin/sh /etc/rc";
3a5
      exec.stop = "/bin/sh /etc/rc.shutdown jail";
>     exec.stop += "/sbin/zfs umount zroot/jails-data/${name}";
24c26
<     exec.prestop += "zfs unjail ${name} zroot/jails-data/${name}";
---
> #    exec.prestop += "zfs unjail ${name} zroot/jails-data/${name}";
```

FYI,

```
# jail -f jail2.conf -c vl2
vl2: created
# jexec vl2 zfs mount
zroot/appjail                   /
zroot/jails-data/vl2            /mnt
# jail -f jail2.conf -r vl2
vl2: removed
# jls -j vl2
   JID  IP Address      Hostname                      Path
jls: jail "vl2" not found
#
```

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