Date: Fri, 26 Oct 2012 23:56:33 GMT From: Marek Salwerowicz <marek_sal@wp.pl> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/173136: (unionfs) mounting above the NFS read-only share panic Message-ID: <201210262356.q9QNuXNO033369@red.freebsd.org> Resent-Message-ID: <201210270000.q9R000d7057654@freefall.freebsd.org>
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>Number: 173136
>Category: misc
>Synopsis: (unionfs) mounting above the NFS read-only share panic
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Oct 27 00:00:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Marek Salwerowicz
>Release: 9.1-PRERELEASE amd64
>Organization:
>Environment:
FreeBSD s14 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0: Thu Oct 4 23:46:19 CEST 2012 ato@volt.iem.pw.edu.pl:/tmp/obj/usr/src/sys/DISKLESS amd64
>Description:
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)
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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