mount * 2 + umount + lookup = GEOM panic

[Kris Kennaway]

On Fri, Aug 18, 2006 at 10:46:57PM +0400, Yar Tikhiy wrote:
> Hi all,
> 
> Here is a recipe how to panic CURRENT's GENERIC kernel from the
> command line:
> 
> (enter single-user mode)
> 
> # mount -r /usr
> # mount -r /usr
> # umount /usr
> # cat
> [panic!]
> 
> As shown below, the panic happens in GEOM when /bin/sh searches
> $PATH for cat(1).  The recipe works in 6-STABLE, too.  Is anybody
> interested?  Thanks!

This has been reported a number of times before, apparently it's
difficult to solve.

Kris
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