protection_fault: icmp_mtudisc_timeout

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c037b5701899 Oops, commited wrong version of CLEANFILES in..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=105db9f4180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=9c4b2390ec9bca28c02d

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/318f9f2ca38f/disk-c037b570.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/48b274978922/bsd-c037b570.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/10df6380856b/kernel-c037b570.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9c4b23...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at icmp_mtudisc_timeout+0xbe: movq 0(%rax),%rcx


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