isofs kernel panic

Hey All,

This is from booting a new installer ISO, generated today from a very
recent commit:

=== Begin Log ===
Trying to mount root from cd9660:/dev/iso9660/11_0__HBSD_AMD64_CD [ro]...
lock order reversal:
 1st 0xfffffe00f6222e40 bufwait (bufwait) _at_ /jenkins/workspace/HardenedBSD-master-amd64/sys/vm/vm_pager.c:380
 2nd 0xfffff800063785f0 isofs (isofs) _at_ /jenkins/workspace/HardenedBSD-master-amd64/sys/kern/imgact_elf.c:883
stack backtrace:
#0 0xffffffff80a7ce70 at witness_debugger+0x70
#1 0xffffffff80a7cd71 at witness_checkorder+0xe71
#2 0xffffffff80a0033b at __lockmgr_args+0xd3b
#3 0xffffffff80ac2fdc at vop_stdlock+0x3c
#4 0xffffffff80fc0fc0 at VOP_LOCK1_APV+0x100
#5 0xffffffff80ae397a at _vn_lock+0x9a
#6 0xffffffff809c4b01 at exec_elf64_imgact+0xa91
#7 0xffffffff809e35e9 at kern_execve+0x4b9
#8 0xffffffff809e2ddc at sys_execve+0x4c
#9 0xffffffff809c760a at start_init+0x26a
#10 0xffffffff809eadb4 at fork_exit+0x84
#11 0xffffffff80e4e9ae at fork_trampoline+0xe
userret: returning with the following locks held:
exclusive lockmgr bufwait (bufwait) r = 0 (0xfffffe00f6222c10) locked _at_ /jenkins/workspace/HardenedBSD-master-amd64/sys/vm/vm_pager.c:380
exclusive lockmgr bufwait (bufwait) r = 0 (0xfffffe00f6222e40) locked _at_ /jenkins/workspace/HardenedBSD-master-amd64/sys/vm/vm_pager.c:380
panic: witness_warn
=== End Log ===

This is 11-CURRENT/amd64, based on HardenedBSD commit
f0a4c61a2e9e2433db632d70d5764e79c5b84b7a. I booted the ISO up in bhyve
using vmrun.sh. I haven't ruled out anything on HardenedBSD's side, yet,
but we don't have any changes that would cause a panic'ing LOR in
vm_pager.c. I'll do some more investigative work when I get some more
sleep. But if anyone has any ideas, please let me know. I kinda wonder
if this is related to the recent VFS changes by FreeBSD.

Thanks,

-- 
Shawn Webb
HardenedBSD

GPG Key ID:          0x6A84658F52456EEE
GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89  3D9E 6A84 658F 5245 6EEE