[plt-scheme] segv in mzscheme; culprit might be BTC_get_memory_use

This struck my IRC bot while it was running; I don't know if I will be
able to reproduce the problem.

I've got the thing sitting in gdb; if someone wants to poke around,
I'd happily give you the credentials needed to connect remotely.

It's trunk revision 12896.

Anyway, I've attached the stack trace.
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