[Bug 217115] bsdiff stops with SIGBUS in some cases

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217115

            Bug ID: 217115
           Summary: bsdiff stops with SIGBUS in some cases
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sperber at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 180017
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180017&action=edit
files that cause the problem

On more recent CURRENT (as far as I can tell at least this year) bsdiff stops
with SIGBUS when comparing the attached files by running
> bsdiff d76057a1a25b15b72ca9961d630b295316894d4ac679e54cd471b85eadf694ea acpi_hp.ko.debug outfile

running
> bsdiff acpi_hp.ko.debug d76057a1a25b15b72ca9961d630b295316894d4ac679e54cd471b85eadf694ea outbl
works fine.

The problem can be reproduced with r313726 and r313041 and can't be reproduced
on freefall (r309137).

idwer on #bsdcode was able to reproduce the problem and provided a truss log:
http://dpaste.com/2JB0GG2

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