kernel panic on jailed sshd - 4.9-release

[Oliver Fromme]

Kovács János <kovacs.janos at ofi.hu> wrote:
 > Just installed 4.9-RELEASE with jailed sshd over a null-mounted (bin,
 > dev,etc,usr)
 > dirs crashing.

It's well-known that NULLFS (as well as UNIONFS) are unstable
in FreeBSD 4.x and can cause crashes.  I'd recommend that you
use loopback NFS instead.  That's what I do for my jails (and
-o union instead of UNIONFS), and it's rock-stable.

Regards
   Oliver

PS:  Also see the "bugs" section in the mount_null(8) manpage.

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Oliver Fromme, secnetix GmbH & Co KG, Oettingenstr. 2, 80538 München
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