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Subject: [Bug 222951] Re-starting a jail with mount.devfs mounts devfs
 multiple times
Date: Thu, 12 Oct 2017 13:07:17 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: bin
X-Bugzilla-Version: 11.1-RELEASE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: vlad-fbsd@acheronmedia.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222951

            Bug ID: 222951
           Summary: Re-starting a jail with mount.devfs mounts devfs
                    multiple times
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: vlad-fbsd@acheronmedia.com

Starting a jail that's configured with 'mount.devfs' with `jail -c` does not
check if devfs is already mounted and mounts it again.

The problem seems to be when the (nopersist) jail is stopped by itself beca=
use
all the processes in it have exited, so it wasn't explicitly `jail -r`. When
that happens, devfs is not unmounted.

So next time the jail is started, devfs is mounted again, resulting with
multiple mounts of devfs into $JAIL_ROOT/dev:

> % mount | grep /zroot/jails/test/dev
> devfs on /zroot/jails/test/dev (devfs, local, multilabel)
> devfs on /zroot/jails/test/dev (devfs, local, multilabel)
> devfs on /zroot/jails/test/dev (devfs, local, multilabel)
> devfs on /zroot/jails/test/dev (devfs, local, multilabel)

If the jail is explicitly stopped with `jail -r`, devfs is unmounted.

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