Issue with gpart "Device Busy"

[Harry Schmalzbauer]

Am 15.04.2020 um 20:35 schrieb ian at dijix.com:
> I have an issue with gpart, it will not let me delete partition ada0p2 responding with “Device Busy”
> The man page gpart(8) says this may be shown if a partition exists but I cannot seem to delete partition 2 in my case via gpart delete or gpart destroy
>
> This is a used disk but new to the machine, I can modify the partition type and create partitions before and after partition 2 but I cannot delete it.
>
> Here’s what I have tried so far:
>
>
> root at beastie:~ # gpart show
> =>        34  1250263661  ada0  GPT  (596G)
>         34      409606        - free -  (200M)
>     409640  1249591904     2  freebsd-ufs  (596G)
> 1250001544      262151        - free -  (128M)
>
> =>       40  976773088  ada1  GPT  (466G)
>        40       1024     1  freebsd-boot  (512K)
>      1064        984        - free -  (492K)
>      2048    4194304     2  freebsd-swap  (2.0G)
>   4196352  972576768     3  freebsd-zfs  (464G)
> 976773120          8        - free -  (4.0K)
>
> root at beastie:~ # gpart delete -i2 ada0
> gpart: Device busy
:
:
> :
> root at beastie:~ # gpart destroy -F ada0
> gpart: Device busy

There might still be situations where 'sysctl kern.geom.debugflags=16' 
helps, but I never needed it in the last years (since 7.x I guess).
Are you sure p2 (-i2) of ada0, most likely home for a ufs filesystem, 
isn't mounted anymore? Was it a mountpoint inside a jail?  Stopping the 
jail might leave network related active sockets blocking the filesystem 
(reboot without starting the jail before deleteing the partition should 
work in that case).

-harry