[Bug 203333] libexecinfo from base has trouble walking a simple stack

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203333

            Bug ID: 203333
           Summary: libexecinfo from base has trouble walking a simple
                    stack
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: saper at saper.info

security/tor-devel ports has a simple test case in C to check for correctness
of the backtrace() reporting:

https://gitweb.torproject.org/tor.git/tree/src/test/test_bt.sh
https://gitweb.torproject.org/tor.git/tree/src/test/test_bt_cl.c
https://gitweb.torproject.org/tor.git/tree/src/test/bt_test.py

One needs https://trac.torproject.org/projects/tor/ticket/17151 applied to make
sure tor's configure considers using external -lexecinfo

When linking the test code against libexecinfo from base (using 10.1 amd64
r283908) a truncated result appears, because there is an unused reserved space
on the stack:


$ ./src/test/test-bt-cl crash

============================================================ T= 1443178736
Tor  died: Caught signal 11
0x102c92d <clean_up_backtrace_handler+0x8d> at
/home/saper/sw/tor/src/test/test-bt-cl
0x8016a8997 <pthread_sigmask+0x497> at /lib/libthr.so.3
0x102c205 <crash+0x25> at /home/saper/sw/tor/src/test/test-bt-cl

instead of 

> env LD_LIBRARY_PATH=/usr/local/lib ./src/test/test-bt-cl crash

============================================================ T= 1443178868
Tor  died: Caught signal 11
0x8016a8997 <pthread_sigmask+1175> at /lib/libthr.so.3
0x8016a81a8 <pthread_getspecific+3544> at /lib/libthr.so.3
0x102c205 <crash+37> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c27f <oh_what+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c2cf <a_tangled_web+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c31f <we_weave+31> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c462 <main+274> at /home/saper/sw/tor/src/test/test-bt-cl
0x102c0f1 <_start+417> at /home/saper/sw/tor/src/test/test-bt-cl

when using libexecinfo from ports.

Is it possible to update libexecinfo in base to fix this problem?

See also 

* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200778
* https://trac.torproject.org/projects/tor/ticket/17151

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