[Bug 249067] coredumps include whole maps

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249067

--- Comment #2 from Mark Johnston <markj at FreeBSD.org> ---
It looks like Linux handles core dump data phdrs the same way we do.  The trick
they use is to create a hole in the core file whenever a never-faulted virtual
page is written.  So a program that maps 512MB, faults a single page, and dumps
core gives:

# ./a.out 
addr is 0x7fc076b57000
Aborted (core dumped)
# du -h core
116K    core
# du -h --apparent-size core
513M    core

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