https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222951
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: [email protected]
Reporter: [email protected]
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 because
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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