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jail: Don't allow jails under dying parents

Description

jail: Don't allow jails under dying parents

If a jail is created with jail_set(...JAIL_DYING), and it has a parent
currently in a dying state, that will bring the parent jail back to
life. Restrict that to require that the parent itself be explicitly
brought back first, and not implicitly created along with the new
child jail.

Differential Revision: https://reviews.freebsd.org/D28515

Details

Provenance
jamieAuthored on Feb 23 2021, 1:04 AM
Differential Revision
D28515: Don't allow jail "accidental" resurrection of dead jails.
Parents
R10:7f06b217c53c: amd64: import asm strlen into libc
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