panic: ifa_update_broadaddr does not support dynamic length (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7019ae976ad9 Run raw IP input in parallel.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1429003b180000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=d8a59be0580bb3f635ed

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/493fc62c8c8e/disk-7019ae97.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/2247efe5d319/bsd-7019ae97.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cb27b5845795/kernel-7019ae97.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d8a59b...@syzkaller.appspotmail.com

d����B ��, ! LO9e � �;x %�Ê��a_�J��q��~ABy�IM.f����p' ��v:���pe����-���룽|QJ�T��eB�`���ѧ29c6uԬ ; X� ��e�C�panic: ifa_update_broadaddr does not support dynamic length
Starting stack trace...
panic(ffffffff8285c5db) at panic+0x16f sys/kern/subr_prf.c:229


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