https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235097
--- Comment #10 from Kristof Provost <k...@freebsd.org> ---
The panic in comment #6 seems to happen because ifp->if_addr has been freed.
(kgdb) fr
#16 0xffffffff80d087e8 in rt_newmaddrmsg (cmd=520194696,
ifma=0xfffff8000753ee00) at /usr/src/sys/net/rtsock.c:1436
1436 m = rtsock_msg_mbuf(cmd, &info);
(kgdb) p info
$8 = {rti_addrs = 18, rti_flags = 0, rti_info = {0x0, 0xfffff8006c4cc300, 0x0,
0x0, 0xdeadc0dedeadc0de, 0xfffff800060102a0, 0x0, 0x0}, rti_ifa = 0x0, rti_ifp
= 0x0,
rti_filter = 0x0, rti_filterdata = 0x0, rti_mflags = 0, rti_spare = 0,
rti_rmx = 0x0}
(kgdb) p *ifp->if_addr
$9 = {ifa_addr = 0xdeadc0dedeadc0de, ifa_dstaddr = 0xdeadc0dedeadc0de,
ifa_netmask = 0xdeadc0dedeadc0de, ifa_ifp = 0xdeadc0dedeadc0de, ifa_carp =
0xdeadc0dedeadc0de,
ifa_link = {cstqe_next = 0xdeadc0dedeadc0de}, ifa_rtrequest =
0xdeadc0dedeadc0de, ifa_flags = 49374, ifa_refcnt = 3735929054, ifa_ipackets =
0xdeadc0dedeadc0de,
ifa_opackets = 0xdeadc0dedeadc0de, ifa_ibytes = 0xdeadc0dedeadc0de,
ifa_obytes = 0xdeadc0dedeadc0de, ifa_epoch_ctx = {data = {0xdeadc0dedeadc0de,
0xdeadc0dedeadc0de}}}
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