From owner-freebsd-stable@FreeBSD.ORG  Fri Nov 14 21:29:06 2003
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Date: Sat, 15 Nov 2003 01:27:00 -0400 (AST)
From: "Marc G. Fournier" <scrappy@hub.org>
To: James Read <james@physicalsegment.com>
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References: <OF05F85375.6DAEB8FC-ONC1256DDD.003BF0E0-C1256DDE.005E1502@felvi.hu>
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cc: freebsd-stable@FreeBSD.ORG
Subject: Re: kernel panic on 4.9-release with nullfs
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On Fri, 14 Nov 2003, James Read wrote:

> > But now after some minutes the same crash. I made some other
> > dump:
> >
> > 1: one nullfs-mounted jail at init 6: reboot after panic: null_checkvp
> > http://turando.felvi.hu/crash/crash_2.tgz   (~430M)
> > http://turando.felvi.hu/crash/gdb.out.2
> >
> >
> > 2: simply nullfs mounted jails: 2xbind9 (etc,named.conf+zone files,usr);
> >       oops proxy(etc,usr); mysqld(etc,usr), djbdns (etc,usr)
> >
>
> Hi, I run sevral jails on 4.9 with a heavey usage of mount_nullfs with
> absolutly no crashes or had any problems with it, same with 4.8 (upgraded
> from 4.8 to 4.9, no mount_nullfs changes to the box)
>
> In the jails, I run bind,samba,apache,smtp/imap
> server(maildir),squid,mysqld,sshd,pureftpd.
>
> This is my mount output:
>
> bash-2.05b# mount
> /dev/ad1s1a on / (ufs, local)
> /dev/ad1s1f on /tmp (ufs, local, soft-updates)
> /dev/ad1s1g on /usr (ufs, local, soft-updates)
> /dev/ad1s1e on /var (ufs, local, soft-updates)
> procfs on /proc (procfs, local)
> /dev/ad3s1 on xxxxx(ufs, local, soft-updates)
> /dev/ad4s1 on xxxxxx(ufs, local, soft-updates)
> /dev/ad5s1 on xxxxxx(ufs, local, soft-updates)
> /dev/ad6s1 on xxxxx(ufs, local, soft-updates)
> /usr/ports on /usr/local/jails/xxxxxxx/usr/ports (null, local)
> /usr/ports on /usr/local/jails/xxxxxxxxx/usr/ports (null, local)
> /usr/ports on /usr/local/jails/xxxxxx/usr/ports (null, local)

k, based on this, all you use nullfs for is mounting ports ... in Kovacs
case, he's got the / running off of it ... there are known issues with
this, especially if any application creates an AF_UNIX socket *on* the
nullfs mounted file system ...