[Bug 253960] panic when destroying a vnet with a wg interface

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253960

            Bug ID: 253960
           Summary: panic when destroying a vnet with a wg interface
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: markj at FreeBSD.org

# kldload if_wg
# jail -c name=test persist vnet path=/
# jexec test ifconfig wg0 create listen-port 54321 private-key `openssl rand
-base64 32`
# jail -r test
panic: vnet_if_uninit:468 tailq &V_ifnet=0xfffffe01ae303070 not empty
cpuid = 20
time = 1614706375
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01aa80e930
vpanic() at vpanic+0x181/frame 0xfffffe01aa80e980
panic() at panic+0x43/frame 0xfffffe01aa80e9e0
vnet_if_uninit() at vnet_if_uninit+0x7b/frame 0xfffffe01aa80e9f0
vnet_destroy() at vnet_destroy+0x160/frame 0xfffffe01aa80ea20
prison_deref() at prison_deref+0x96c/frame 0xfffffe01aa80ea90
sys_jail_remove() at sys_jail_remove+0x119/frame 0xfffffe01aa80eac0
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe01aa80ebf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01aa80ebf0
--- syscall (508, FreeBSD ELF64, sys_jail_remove), rip = 0x8003c507a, rsp =
0x7fffffffe858, rbp = 0x7fffffffe8e0 ---

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