Date: Wed, 22 Jun 2005 11:24:16 -0400 From: Kris Kennaway <kris@obsecurity.org> To: GiZmen <gizmen@zion.vsip.pl> Cc: hackers@freebsd.org Subject: Re: instability with mount_nullfs and jails Message-ID: <20050622152416.GA18990@xor.obsecurity.org> In-Reply-To: <20050620175031.GA50395@procent.t2.ds.pwr.wroc.pl> References: <20050620175031.GA50395@procent.t2.ds.pwr.wroc.pl>
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On Mon, Jun 20, 2005 at 07:50:31PM +0200, GiZmen wrote:
> hi,
>=20
> I have problem with mount_nullfs and jails. My system FreeBSD 5.4-STABLE
> when have two jails and each of this jails has couple mount_nullfs freeze
> without kernel panic. It freezes out in random times. Sometimes it can run
> for couple days sometimes it freezes after couple hours.
>=20
> I have mount points like below:
>=20
> root@procent:~# mount
> /dev/ad0s1a on / (ufs, local)
> devfs on /dev (devfs, local, multilabel)
> /dev/ad0s1e on /tmp (ufs, local, nodev, nosuid, nosymfollow, soft-updates=
, multilabel, acls)
> /dev/ad0s1f on /usr (ufs, local, nodev, soft-updates, multilabel, acls)
> /dev/ad0s1d on /var (ufs, local, nodev, nosuid, soft-updates, multilabel,=
acls)
> /usr/local/bandwidthd/htdocs on /usr/jails/httpd/www/traf (nullfs, local,=
nodev, noexec, nosuid, read-only)
> /usr/local/share/pear on /usr/jails/httpd/lib/php/pear (nullfs, local, no=
dev, noexec, nosuid, read-only)
> /usr/local/share/smarty on /usr/jails/httpd/lib/php/smarty (nullfs, local=
, nodev, noexec, nosuid, read-only)
> /usr/local/lib/php/20020429 on /usr/jails/httpd/lib/php/20020429 (nullfs,=
local, nodev, noexec, nosuid, read-only)
> /usr/local/libexec/apache on /usr/jails/httpd/libexec/apache (nullfs, loc=
al, nodev, noexec, nosuid, read-only)
> /usr/local/etc/php on /usr/jails/httpd/etc/php (nullfs, local, nodev, noe=
xec, nosuid, read-only)
> /usr/local/bin on /usr/jails/httpd/bin (nullfs, local, nodev, nosuid, rea=
d-only)
> devfs on /usr/jails/httpd/dev (devfs, local, multilabel)
> /dev/ad0s1g.bde on /crypto (ufs, local, noatime, nodev, nosuid, synchrono=
us, soft-updates, multilabel, acls)
> /dev/ad2s1a.bde on /crypto2 (ufs, local, noatime, nodev, nosuid, synchron=
ous, soft-updates, multilabel, acls)
> /crypto/home on /usr/jails/users/home (nullfs, local, nodev)
> /crypto/home on /usr/jails/httpd/home (nullfs, local, nodev, noexec, nosu=
id)
>=20
> from fstab.sshd:
>=20
> /bin /usr/jails/users/bin nullfs ro,nosuid,nodev =
0 0
> /sbin /usr/jails/users/sbin nullfs ro,nodev 0 =
0
> /usr/ports /usr/jails/users/usr/ports nullfs rw,nosuid,nodev 0=
0
> /usr/include /usr/jails/users/usr/include nullfs ro,nosuid,noexec,=
nodev 0 0
> /usr/share /usr/jails/users/usr/share nullfs ro,nosuid,nodev,noexe=
c 0 0
> /usr/lib /usr/jails/users/usr/lib nullfs ro,nosuid,nodev =
0 0
> #/lib /usr/jails/users/lib nullfs ro,nosuid,nodev,noex=
ec 0 0
> #/libexec /usr/jails/users/libexec nullfs ro,nosuid,nodev =
0 0
> /usr/bin /usr/jails/users/usr/bin nullfs ro,nodev 0 =
0
> /usr/sbin /usr/jails/users/usr/sbin nullfs ro,nodev 0 =
0
> /usr/libexec /usr/jails/users/usr/libexec nullfs ro,nodev =
0 0
>=20
>=20
> When i start sshd jail with mount_nulls like above i will have crash afte=
r random period of time.
> Without this jail i have never had any freeze. home dir in users jail is =
mount_nulled from /crypto
> partition.Earlier my users jails didnt have mount_nulls, i have had copy =
of each dir. I could have
> uptime like 80 days. I dont know why it is so instabile?
> Could any one point me somehow ? Maybe i do someting wrong or someting?
Be specific about your crash. See the Developers' Handbook chapter on
kernel debugging for the minimum information needed to proceed further
with this.
Kris
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