virtualbox.org

I have a VM that used to work with vbox 4.2. It booted from a ipxe iso.

It broke as soon as I upgraded to vbox 4.3.

After the prompt of loading krn, a critical error dialog popped up and force shutdown.

The host is Ubuntu Precise 64. And the same VM works with network boot or other isos.

I attached the log, any clue?

00:00:03.146453 !! Guru Meditation 1155 (VINF_EM_TRIPLE_FAULT)

Very rare error, can't seem to find any proper information on the forum or Google.
Maybe the other mods or one of the devs can help here

The triple fault "error" isn't an error as such. It simply means that the virtual CPU is in a state where it cannot continue execution. The real cause of the problem is somewhere else, but there isn't (can't be) enough information in the log file to reconstruct what happened.