On Oct 20, 2012, Borislav Petkov wrote: 

> Yeah, your kernel is tainted with a proprietary module (vbox*, etc). Can
> you reproduce your corruptions (this is what it looks like) without that
> module?

Yes, I can reproduce this panic with zero proprietary/non-free modules loaded.

The problem is the kernel doesn't even print a kernel panic - the
system just freezes completely - cursor in a text console stops blinking.

I have no means to debug it using a serial console - what can I do?