I have VirtualBox VM running 13-CURRENT. Environments are Host: 64bit Windows 10 ver. 1909 VirtualBox: 6.1.10 VM: 4CPU, 8GB Memory, 100GB Disk, Audio disabled. Bridged NIC In order to switch from legacy BIOS to UEFI I enabled UEFI on VM settings and reinstalled OS by using FreeBSD-13.0-CURRENT-amd64-20200611-r362037-disc1.iso. After that `shutdown -p now` (or select 'ACPI shutdown' in VM menu) fails to power off. Shutdown itself completes successfully. But power off never happens and CPU usage keeps high until either closing or resetting VM. If I switch back to legacy BIOS and reinstall OS then the problem disappears. And it doesn't happen with either 11.4-RELEASE or 12.1-RELEASE. I tried bisect and found this problem happens with base r342108 and after. Commit message of base r342108 says as following. yasu@rolling-vm-freebsd5[1012]% LANG=C svn log -c 342108 ------------------------------------------------------------------------ r342108 | cem | 2018-12-15 14:46:04 +0900 (Sat, 15 Dec 2018) | 7 lines efirt: When present, attempt to use EFI runtime services to shutdown PR: maybe related to 233998 (inconclusive at this time) Submitted by: byuu <byuu AT tutanota.com> (previous version) Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D18506 ------------------------------------------------------------------------ yasu@rolling-vm-freebsd5[1013]%
By adding "tunable hw.efi.poweroff=0" to /boot/loader.conf `shutdown -p now` successfully powers off system.