after DISabling timesync in VB linux guest's GuestAdditions, boot errors: "timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED" ?

[pgnd]

I run

rpm -qa | grep -i virtualbox
	VirtualBox-6.1-6.1.14_140239_fedora32-1.x86_64

uname -rm
	5.8.13-200.fc32.x86_64 x86_64

for both host & guests.

I've been having lots of time-sync issues in guests -- large drifts, time jumping forward & backwards, etc.

That's despite running chrony time sync clients in each guest.

After some digging, found this

​https://docs.oracle.com/en/virtualization/virtualbox/6.1/admin/fine-tune-timers.html#disabletimesync

and disabled timesync in clients' GuestAdditions, with

VBoxManage setextradata "<vm name>" "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" 1

Now, on guest reboot, I'm seeing these errors in guest dmesg log,

dmesg | egrep -i "timesync|virtualbox"
	[    0.000000] DMI: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
	[    2.123518] usb 2-1: Manufacturer: VirtualBox
	[    2.134288] input: VirtualBox USB Tablet as /devices/pci0000:00/0000:00:06.0/usb2/2-1/2-1:1.0/0003:80EE:0021.0001/input/input5
	[    2.134476] hid-generic 0003:80EE:0021.0001: input,hidraw0: USB HID v1.10 Mouse [VirtualBox USB Tablet] on usb-0000:00:06.0-1/input0
	[   27.809171] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
	[   27.809255] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
	[   57.418443] 02:19:39.352350 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[   66.602300] 02:19:49.375515 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[   75.767563] 02:19:59.378440 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[   84.932750] 02:20:09.381252 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[   94.098285] 02:20:19.384482 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[  103.264664] 02:20:29.388593 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[  112.496162] 02:20:39.463769 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[  121.658906] 02:20:49.463953 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[  130.822255] 02:20:59.464766 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED
	[  139.985037] 02:21:09.464959 timesync Error: vgsvcTimeSyncWorker: VbglR3GetHostTime failed; rc2=VERR_NOT_SUPPORTED

Clearly 'errors', not warnings ...

Either a bug, or add'l config is needed to fix/silence that ^...