According to Bonwick's paper (available from
ftp://ftp.bitmover.com/pub/slab.ps, as more than one person has asked
recently -- thanks lmcvoy),
``Redzone checking detects writes past the end of a buffer. The
allocator checks for redzone violations by adding a guard word to the
end of each buffer and verifying that it is unmodified when the buffer
is freed.''
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