panic: unhandled af (6)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: eec9cf095b26 Do not sanitize title when popping it from st..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11e1e696580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=18702aa07d5443a7e32b

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/779e5f466484/disk-eec9cf09.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/85b67464a6c8/bsd-eec9cf09.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f842299c099/kernel-eec9cf09.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+18702a...@syzkaller.appspotmail.com

panic: unhandled af 18
Starting stack trace...
panic(ffffffff8347b87e) at panic+0x1d0 sys/kern/subr_prf.c:229


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