If there's an unexpected reboot when attempting to boot GhostBSD in VirtualBox, you can probably avoid the issue in one of two ways:

• boot in safe mode
• set the virtual machine to use no more than one CPU.

Related: FreeBSD bug 254412 – emulators/virtualbox-ose-additions - Boot time crash - Sleeping thread owns a non-sleepable lock

A recording of a kernel panic: https://photos.app.goo.gl/P2QfK5yqHYJ2SYzM8

Four frames from the recording:

1. https://photos.app.goo.gl/UX3Awri3hZLAFZrXA
2. https://photos.app.goo.gl/VfYP8YD3ryKn5C8r5
3. https://photos.app.goo.gl/iTwbWeftrnXtZyGz5
4. https://photos.app.goo.gl/QQshL8Up2YCMsLwX7

https://wiki.ghostbsd.org/index.php/Vir ... VirtualBox updated.