From owner-freebsd-ports@FreeBSD.ORG  Fri Nov 25 12:37:11 2005
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Date: Fri, 25 Nov 2005 10:37:09 -0200
From: Thiago Damas <tdamas@gmail.com>
To: freebsd-ports@freebsd.org
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Subject: kernel panic with sshfs (FUSE)
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  I experimented a kernel panic, when trying to create a md device
using a file located in a sshfs (FUSE) filesystem;
# pkg_info | grep fuse
fusefs-kmod-0.2.19.6 Kernel module for fuse
fusefs-libs-2.4.1   FUSE allows filesystem implementation in userspace
fusefs-sshfs-1.3_1  Mount remote directories over ssh

# uname -a
FreeBSD noc2.interno 6.0-RELEASE FreeBSD 6.0-RELEASE #3: Thu Nov 10
21:07:03 BRST 2005   =20
root@noc2.interno:/usr/src/sys/i386/compile/NOC2  i386

  Unfortunately, I havent DEBUG flags turned ON in this kernel, but
its easy to reproduce:
# mount
...
/dev/fuse0 on /mnt/sshfs (fusefs, local, synchronous)

# cd /mnt/sshfs
# mdconfig -a -f somefile.img
<KERNEL PANICS WHERE>

  Maybe will be  necessary to introduce some code in the fusefs module
to deny this operation, IMHO.