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Re: problems with a subhurd

From: Justus Winter
Subject: Re: problems with a subhurd
Date: Mon, 28 Nov 2016 10:34:07 +0100


Olaf Buddenhagen <olafbuddenhagen@gmx.net> writes:
> On Sun, Sep 04, 2016 at 12:34:09PM +0200, Justus Winter wrote:
>> I recommend against shutting down subhurds.
> This is a regression, though -- I'm pretty sure I used `halt` and/or
> `reboot` in subhurds in the past. (Sometimes it failed; but it never
> broke my main instance IIRC...)

Ok, let me clarify:

I recommend against shuttind down subhurds running sysvinit, like
Debian.  Sysvinit shutdown of the subhurd will killall processes of the
parent hurd.

If you must, always use 'halt -f', or 'halt-hurd'.  This will circumvent
the sysvinit shutdown, and merely execute the hurd shutdown, which is

Also let me stress that this is not a regression.  Traditional subhurds
were very careful not to harm the parent hurd despite having the
privileges to do so.  We have extra code in /hurd/startup dealing with
being a "nice" privileged subhurd.  However, that has never been robust,
the parents processes were always accessible from the subhurd.

In any case, with the new unprivileged subhurds any shutdown procedure
is fine.


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