[Bug 210907] [lor] lock order reversal in /usr/src/sys/kern/kern_jail.c:1031

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210907

            Bug ID: 210907
           Summary: [lor] lock order reversal in
                    /usr/src/sys/kern/kern_jail.c:1031
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd at otoh.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

lock order reversal:
 1st 0xffffffff81dc4118 allprison (allprison) @
/usr/src/sys/kern/kern_jail.c:1031
 2nd 0xffffffff81de9c68 vnet_sysinit_sxlock (vnet_sysinit_sxlock) @
/usr/src/sys/net/vnet.c:574
stack backtrace:
#0 0xffffffff80aae180 at witness_debugger+0x70
#1 0xffffffff80aae074 at witness_checkorder+0xe54
#2 0xffffffff80a56e73 at _sx_slock+0x73
#3 0xffffffff80b6a451 at vnet_alloc+0xf1
#4 0xffffffff80a16d2e at kern_jail_set+0x1d8e
#5 0xffffffff80a18801 at sys_jail_set+0x41
#6 0xffffffff80f16b2b at amd64_syscall+0x2db
#7 0xffffffff80ef68cb at Xfast_syscall+0xfb
ifa_maintain_loopback_route: deletion failed for interface lo0: 48


Noticed when shutting down a jail.
11.0 Alpha 6

Delta from GENERIC:
device pf
device pflog
device pfsync

options VIMAGE
options ALTQ
options ALTQ_CBQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_HFSC
options ALTQ_CDNR
options ALTQ_PRIQ
options ALTQ_NOPCC

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