protection_fault: pool_p_free

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0086034dedf2 don't complain about a driver not supporting ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=100bbcb4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=623f5b11cea70cc3d4d4

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/77ce8a5e3848/disk-0086034d.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/0aeaf0348339/bsd-0086034d.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fae05e4cb343/kernel-0086034d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+623f5b...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at pool_p_free+0xc0: movq 0(%r12),%rbx


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