[Bug 264981] jail with vnet interface stuck in dying state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264981

--- Comment #8 from Zhenlei Huang <zlei.huang@gmail.com> ---
Non-vnet jails are also affected.

Steps to repeat:

1: root@:~ # ifconfig lo0 inet 172.16.0.1/32 alias
2: root@:~ # sh test_prison_ref_leak.sh
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet 172.16.0.1 netmask 0xffffffff
        groups: lo
   JID  IP Address      Hostname                      Path
jls: jail "test_ref_leak" is dying


The content of test_prison_ref_leak.sh:

root@:~ # cat test_prison_ref_leak.sh 
#!/bin/sh

# test jail name
n="test_ref_leak"

jail -c name=$n path=/ persist ip4.addr=172.16.0.1
# The following trigger jail pr_ref leak
jexec $n ifconfig lo0
jail -R $n

# wait a moment
sleep 1

jls -j $n

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