instability with mount_nullfs and jails

[Kris Kennaway]

On Mon, Jun 20, 2005 at 07:50:31PM +0200, GiZmen wrote:
> hi,
> 
> 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.
> 
> I have mount points like below:
> 
> root at 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, nodev, 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, local, nodev, noexec, nosuid, read-only)
> /usr/local/etc/php on /usr/jails/httpd/etc/php (nullfs, local, nodev, noexec, nosuid, read-only)
> /usr/local/bin on /usr/jails/httpd/bin (nullfs, local, nodev, nosuid, read-only)
> devfs on /usr/jails/httpd/dev (devfs, local, multilabel)
> /dev/ad0s1g.bde on /crypto (ufs, local, noatime, nodev, nosuid, synchronous, soft-updates, multilabel, acls)
> /dev/ad2s1a.bde on /crypto2 (ufs, local, noatime, nodev, nosuid, synchronous, 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, nosuid)
> 
> from fstab.sshd:
> 
> /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,noexec      0       0
> /usr/lib        /usr/jails/users/usr/lib    nullfs  ro,nosuid,nodev      0       0
> #/lib            /usr/jails/users/lib        nullfs  ro,nosuid,nodev,noexec      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
> 
> 
> When i start sshd jail with mount_nulls like above i will have crash after 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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