Actually, I suspect my ACPI temperature problem is a BIOS bug. I just
found a new BIOS revision for my motherboard, and I'm trying it now - it
may be a couple of days before I find out for sure if the new BIOS fixes
it. In my case, the bad readings come at random times, sometimes for a
few seconds, and sometimes long enough to force a system shutdown - but
lm_sensors always reports sensible temperatures. At worst, the bad ACPI
temperature readings force system shutdowns, and I can use acpi=off as a
workaround.

The page_mapcount problem is far worse, as it causes a crash. I've only
seen it once so far.

Correction on the CPU type: my system is using a 4800+, not a 3800+.

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page_mapcount(page) went negative
https://bugs.launchpad.net/bugs/123223
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