It works on CURRENT. I want r355686 to be MFCed. I can confirm r355686 works for me. https://svnweb.freebsd.org/base?view=revision&revision=355686
A commit references this bug: Author: jhb Date: Wed Dec 2 23:16:25 UTC 2020 New revision: 368289 URL: https://svnweb.freebsd.org/changeset/base/368289 Log: MFC 355686: Fix a mismerge in r355683 and remove the local gdb_port from main. PR: 251501 Reported by: Yuichiro NAITO <naito.yuichiro@gmail.com> Changes: _U stable/12/ stable/12/usr.sbin/bhyve/bhyverun.c
Oops, thanks. I hadn't tagged the fix with an MFC after reminder.