I am using a diskless mode of FreeBSD with root ('/') read-only mounted from my server. The /tmp directory is mounted as tmpfs. After creating eg. /tmp/istgt directory, mounting it (using mount_unionfs) above the eg. /usr/local/etc/istgt directory and editing existing file (istgt.conf), I receive a kernel panic s14% mount 194.29.146.3:/ on / (nfs, read-only) devfs on /dev (devfs, local) /dev/md0 on /etc (ufs, local) procfs on /proc (procfs, local) tmpfs on /tmp (tmpfs, local) tmpfs on /var (tmpfs, local) output from machine console: https://www.dropbox.com/s/e3wocs9tx0fip6e/20121026434.jpg https://www.dropbox.com/s/jzwjrda5itoyuez/20121026436.jpg How-To-Repeat: [assume that /tmp is tmpfs, and / is mounted read-only from NFS server] % sudo mkdir /tmp/istgt % sudo mount_unionfs /tmp/istgt /usr/local/etc/istgt % vim /usr/local/etc/istgt/istgt.conf (edit file and save it, using :wq)
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