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Instability on amd64 -current

I've updated a couple of my systems to -current built from sources checked out on 2012-01-07 at 01:47:13 ...

The systems are quite unstable, with random "hangs" occurring, usually when the system is under a bit of a load (such as while running the /etc/daily job). When the system hangs, the console monitor is totally black (there is, however, still a valid video output, since the monitor is able to acheive sync).

On one system, X was running, although I had switched the wsconsole to the console display with Ctrl/Alt/F1. On another system, no X was running. The instability occurs both with my own custom kernel and with GENERIC.

On the non-X system, the most recent hang was especially interesting! When I manually reset the machine, the BIOS could not find the boot device wd0. I actually had to remove mains power from the machine and then re-boot before it saw the hard drive!

Any suggestions?

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