[Bug 273956] KERN_PROC_VMMAP does not read all mapped files

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273956

--- Comment #13 from Ed Maste <emaste@freebsd.org> ---
(In reply to Konstantin Belousov from comment #12)
The issue is just in Valgrind's assumptions of what the mappings will be.

I spotted this comment in its src:
   /* A segment in the initial /proc/self/maps is considered a FileV
      segment if either it has a file name associated with it or both its
      device and inode numbers are != 0. See bug #124528. */

(It references /proc/self/maps from its Linux origins, but provides a sysctl
implementation on FreeBSD)

Also this comment:
   If there is no RX or no RW mapping then we will not attempt to
   read debuginfo for the file.

I think all of this logic is an attempt to determine if maps are part of
valgrind itself or the target process.

   If allow_SkFileV is True, it will try load debug info if the
   mapping at 'a' belongs to Valgrind; whereas normally (False)
   it will not do that.  This allows us to carefully control when
   the thing will read symbols from the Valgrind executable itself.

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