Process hierarchy on a DC?

[Jeremy Allison]

On Thu, Apr 27, 2017 at 12:04:58PM +0200, vl--- via samba-technical wrote:
> Hi!
> 
> With current master 5701880655c8a82b6 I'm getting the following
> process hierarchy (omitting the duplicate children):
> 
> 24963 ?        Ss     0:00 bin/samba
> 24964 ?        S      0:00  \_ bin/samba
> 24969 ?        S      0:00 bin/samba
> 24971 ?        Ss     0:00  \_ /root/samba/bin/smbd -D --option=server role check:inhibit=yes --foreground
> 24991 ?        S      0:00      \_ /root/samba/bin/smbd -D --option=server role check:inhibit=yes --foreground
> 24979 ?        S      0:00 bin/samba
> 24981 ?        Ss     0:00  \_ /root/samba/bin/winbindd -D --option=server role check:inhibit=yes --foreground
> 24990 ?        S      0:00      \_ /root/samba/bin/winbindd -D --option=server role check:inhibit=yes --foreground
> 
> I think I remember that in the past this was all located under one
> "samba" process, now the winbind and smbd parents are themselves
> children of init. I could stop the DC with a single kill, now it's
> three.
> 
> Just curious: Why was this changed?

It's the tfork code. I'd bet good money on it :-).

samba_runcmd_send() which is used to invoke winbindd
calls tfork() directly.

This is a side effect I missed in my review of
the tfork code, but in my defense both Ralph
and Metze who were the authors missed it too :-).

Ralph, Metze, ball is in your court I think :-).

Jeremy.