VirtualBox went into Guru Meditation

[OliJ]

As I was starting a 2nd VM with a Win2k, the first VM with a Win2k was interrupted.

The error is: Guru Meditation -4004 (VERR_VMX_INVALID_VMXON_PTR)
Please see the attached logs.

On the interrupted VM itself, only an Oracle 9.2 DB service was running. Nothing else. No one was accessing the DB at that time. The DB is supposed to be accessed via LAN (briged) from the host.

Host: Win7 x64, Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
Guest: Win2k
VirtualBox: 5.0

Does someone have an idea what went wrong?

[OliJ]

I saw Ticket #14088 meanwhile, which states that running Virtual PC at the same time can produce this kind of exception. I stopped Virtual PC and will watch VirtualBox in the next days in order to see if the problem occurs again.

[mpack]

Neither VirtualPC nor "XP mode" uses VT-x AFAIK, so I can't see what the conflict would be. The suggestion otherwise in the discussion of that ticket was speculation by a user, not a comment from one of the devs.

The competing VT-x user could be VMWare etc, or some AV apps. Or it could be some orphaned VBox process after a crash: reboot the host and try again.