INVARIANTS (was Re: RELENG_4 -> 5 -> 6: significant performance regression)

[Ulrich Spoerlein]

Matthew D. Fuller wrote:
> On Sat, May 13, 2006 at 11:58:26AM -0400 I heard the voice of
> Kris Kennaway, and lo! it spake thus:
> > 
> > FYI, INVARIANTS adds checks but does not (is not supposed to) divert
> > code paths.
> 
> It does at least in UMA; it does a lot of bzero()/NULL'ing out of
> memory, which might hide later uninitialized-use bugs that could bite
> you without it

Shouldn't it write something like 0xdeadc0de or 0x0d0d0d0d to memory
-- like user-land memory debugging tools do -- to catch read-before-write
bugs?

Ulrich Spoerlein
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