debian 10: update to 6.1.6 causes a "critical error" for all guests

[consultit25]

Hi, I've just upgraded to VirtualBox "6.1.6 r137129" on my host debian 10, but all VMs guests (both windows and linux) issue a "critical error" that prevent them to run. I've attached the logs of a VM (all VMs issue the same kind of error).
Any suggestion would be appreciated.

[scottgus1]

For this guest, the guru meditated over VERR_INVALID_STATE.

It meditated right after power-up, before touching anything in the guest OS:

00:00:01.068160 Changing the VM state from 'CREATING' to 'CREATED'
00:00:01.070443 Changing the VM state from 'CREATED' to 'POWERING_ON'
00:00:01.070508 AIOMgr: Endpoints without assigned bandwidth groups:
00:00:01.070517 AIOMgr: /usr/share/virtualbox/VBoxGuestAdditions.iso
00:00:01.070519 AIOMgr: /FREE/VMs/win10/win10.vdi
00:00:01.070889 Changing the VM state from 'POWERING_ON' to 'RUNNING'
00:00:01.070898 Console: Machine state changed to 'Running'
00:00:01.080380 Changing the VM state from 'RUNNING' to 'GURU_MEDITATION'
00:00:01.080399 Console: Machine state changed to 'GuruMeditation'

This might be part of the invalidity:

00:00:00.847650 Host RAM: 32114MB (31.3GB) total, 14394MB (14.0GB) available
00:00:00.933980 RamSize <integer> = 0x0000000400000000 (17 179 869 184, 16 384 MB, 16.0 GB)

Somehow you also got 256MB video ram and no 3D acceleration:

00:00:00.934215 3DEnabled <integer> = 0x0000000000000000 (0)
00:00:00.934222 VRamSize <integer> = 0x0000000010000000 (268 435 456, 256 MB)

When 3D is off the max video ram is only 128MB.

See what you can do about these issues.