[gentoo-amd64] Capturing hard hang info?

[Mark Knecht]

Hello all,
   I'm having a bit of an issue here with a machine that's completely
hanging and unresponsive. No magic sys request keys, keyboard and
mouse are dead, cannot shell in or even ping from another machine on
the network. For all intents and purposes it's a dead as one of
Dexter's targets. I believe the problem is virtualbox-4.3 related. I
didn't see it with vb-4.2.18 or any earlier version. However there
were 3.10.16 & 17 updates, along with whatever else Gentoo has
provided in the last week or two so there's a chance it could be
anything, including hardware.

   Anyway, I've dropped back to gentoo-sources-3.10.15 which never
exhibited a problem, along with vb-4.2.18. I'm running memtest86 and
looking for anything it might spot. My RAID6 appears to have no
problems through any of these hangs, or at least a scrub of the RAID
doesn't show it.

   There's nothing in /var/log/messages or Xorg.0.log that I see.

   My question, after this long setup, is what can I do, if anything,
to capture and other info about what's really causing the problem?

   I'm currently just doing obvious regression stuff. Installing old
versions, running for awhile, etc., trying to figure out if it's a
single package. Not real effective but maybe it's all I can do with
this sort of problem?

Thanks in advance,
Mark