Comment 13 for bug 358915

>> I can't even rule out hardware failure or a Kernel issue (perhaps caused by a binary module, or virtualisation software)

I was thinking maybe it could have something to do with VirtualBox driver (vboxdrv), which is loaded at boot time.
The module iwlagn (intel wireless) is another not-so-stable driver which is loaded at boot, wich caused a lot of ugly backtraces to printed in tty01 when shutting down my previous Intrepid installation. But I feel inclined to point a finger on vboxdrv.

I'll keep an eye on those two miscreants.