[Bug 186360] [jail] jail using nullfs and unionfs doesn't mount devfs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=186360

johannes at jo-t.de changed:

           What    |Removed                     |Added
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                 CC|                            |johannes at jo-t.de

--- Comment #5 from johannes at jo-t.de ---
I have the same problem on:

FreeBSD fred 9.3-STABLE FreeBSD 9.3-STABLE #0 r272448: Fri Oct  3 19:02:13 BST
2014     root at fred:/usr/obj/usr/src/sys/FRED  amd64

By the looks of it, something deletes the stuff in the to-be-jailed /dev after
devfs is mounted there. Unmounting and remount it makes it work properly. Also,
mounting devfs from a prestart script (and preventing jail start up by
returning exit code 1), makes devfs behave well.
So I'd suspect when jail(8) goes about starting up everything it messes up the
device nodes.

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