From owner-freebsd-hackers  Fri Jun 21 23:55:10 2002
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From: "Nielsen" <nielsen@memberwebs.com>
To: "Patrick Thomas" <root@utility.clubscholarship.com>,
	<hackers@freebsd.org>
References: <20020621153616.Y68572-100000@utility.clubscholarship.com>
Subject: Re: (jail) problem and a (possible) solution ?
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Yes I've had the same problem. One system runs just fine with it's jails,
and another crashes habitually. It has to do with a certain jail (and
services). Our system are set up to be able to move jails between them
(great for backups and near perfect uptime), and a certain set of jails
always hangs the system in this way. I'm trying to narrow it down. Do you
get a core dump or does it just hang?

Nate

----- Original Message -----
From: "Patrick Thomas" <root@utility.clubscholarship.com>
To: <hackers@freebsd.org>
Sent: Friday, June 21, 2002 16:43
Subject: (jail) problem and a (possible) solution ?


>
> A test server of mine running a number of jails keeps locking up - but the
> odd thing about the lockup is that the userland stops, but the kernel
> keeps running
>
> (sockets can be opened, but the servers never respond on them, the machine
> still responds to pings, but logs show that all real activity stops)
>
> I just noticed today that some jails still have writable /dev/mem and
> /dev/kmem and /dev/io nodes.  I think it is plausable that some kind of
> fiddling (writing) to these nodes is causing this kind of lockup.
>
> ----
>
> Is this assumption reasonable, or if some jail user fiddled with their
> /dev/mem or /dev/kmem or /dev/io node would it just totally crash out the
> machine and I _wouldn't_ still be able to ping the server after it crashes
> ?
>
> thanks,
>
> PT
>
>
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