[Bug 247420] panic: starting DAD on non-tentative address ...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247420

            Bug ID: 247420
           Summary: panic: starting DAD on non-tentative address ...
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: ipv6
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: net at FreeBSD.org
          Reporter: bz at FreeBSD.org

plugging in a USB WIFI dongle I got this; unclear if it was from this one or
another one which got toggled down/up ...  fairly recent HEAD of sometime the
last two weeks.  I thought these panics were gone ..

panic: starting DAD on non-tentative address 0xfffff80003990600
cpuid = 1
time = 1502195081
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe003b653690
vpanic() at vpanic+0x182/frame 0xfffffe003b6536e0
panic() at panic+0x43/frame 0xfffffe003b653740
nd6_dad_start() at nd6_dad_start+0x3bb/frame 0xfffffe003b6537e0
in6_if_up() at in6_if_up+0x62/frame 0xfffffe003b653820
if_up() at if_up+0x69/frame 0xfffffe003b653850
ifhwioctl() at ifhwioctl+0xbf8/frame 0xfffffe003b6538d0
ifioctl() at ifioctl+0x3ac/frame 0xfffffe003b6539a0
kern_ioctl() at kern_ioctl+0x27b/frame 0xfffffe003b653a00
sys_ioctl() at sys_ioctl+0x127/frame 0xfffffe003b653ad0
amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe003b653bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe003b653bf0
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80047cd8a, rsp =
0x7fffffffe258, rbp = 0x7fffffffe2b0 ---
KDB: enter: panic
[ thread pid 42874 tid 100086 ]
Stopped at      kdb_enter+0x37: movq    $0,0x10c9ad6(%rip)
db> show reg
cs                        0x20
ds                        0x3b  ll+0x1a
es                        0x3b  ll+0x1a
fs                        0x13
gs                        0x1b
ss                        0x28  ll+0x7
rax                       0x12
rcx                       0x80  ll+0x5f
rdx         0xfffffe003b653580
rbx         0xffffffff8123674c
rsp         0xfffffe003b653680
rbp         0xfffffe003b653690
rsi                       0x80  ll+0x5f
rdi         0xffffffff81c8e6d8  cnputs_mtx
r8                        0x10
r9          0xffffffff80c15ae0  putchar
r10         0xffffffff81afca10  vga_conssoftc
r11                       0x10
r12                        0x1
r13         0xfffff80003990600
r14                          0
r15         0xfffffe0032deb000
rip         0xffffffff80c0f3b7  kdb_enter+0x37
rflags                    0x82  ll+0x61
kdb_enter+0x37: movq    $0,0x10c9ad6(%rip)

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