After installing Guest Additions, my ReactOS(both 0.4.14 and 0.4.15 977c129) stuck at logo. In debug mode it enters kdb.
Virtualbox version: 6.1.28
On real hardware with HD4000 video card, this is also observed though I can't create a log.
Logs and translated logs(those with t) are uploaded.
Note: sometimes it instead shows a BSOD after logo that says 0xB4(0xC0000001,0x00000000,0x00000000,0x00050000)