[7ca0fdf] Disable munmap() if it causes VM map holes

[Mike Hommey]

On Mon, Apr 16, 2012 at 02:40:52PM -0700, Jason Evans wrote:
> On Apr 16, 2012, at 2:19 PM, Mike Hommey wrote:
> > Hoped for 0x7f82e5237000, got 0x7f82e5237000
> > 0x7f82e5637000..0x7f82e5237000..0x7f82e4e37000..0x7f82e4637000..0x7f82e5237000
> 
> Huh.  The only explanation I can think of is that the dynamic loader
> is calling mmap in the midst of the mmap/munmap calls, thus resetting
> the "start from" address to use for address scanning.

It's not even that. The only mmaps happening are these ones. The dynamic
linker is done when main is entered.

Mike