test_gdb fails for me on OSX

Steps I did to duplicate: 
Checked out fresh '2.7' branch from https://github.com/python/cpython.git
From the new cypthon dir ran: 
./configure
make
make test
./Lib/test/regrtest.py -v test_gdb

Attached the full verbose output. 

I am looking at Issue23137 and the output messages look different than mine, so I'm posting this as a separate issue. Perhaps it is duplicate. 

34 tracebacks included in attachment, but below is a sample for reference: 

======================================================================
FAIL: test_NULL_instance_dict (test.test_gdb.PrettyPrintTests)
Ensure that a PyInstanceObject with with a NULL in_dict is handled
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_gdb.py", line 521, in test_NULL_instance_dict
    exptype='Foo')
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_gdb.py", line 459, in assertSane
    cmds_after_breakpoint=cmds_after_breakpoint)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_gdb.py", line 239, in get_gdb_repr
    import_site=import_site)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_gdb.py", line 224, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ['Unable to find Mach task por... != []

First list contains 4 additional elements.
First extra element 0:
Unable to find Mach task port for process-id 53220: (os/kern) failure (0x5).

Github repo version was 4935c6c381b196334b97aac4e9e4e8fee35b0947

As you may know, GNU gcc and gdb have not been included in the standard development tools shipped with Apple as part of Xcode and the Command Line Tools for a number of releases, in favor of llvm/clang and lldb.  So test_gdb is typically automatically skipped on current OS X releases.  That said, if you install gcc and gdb from a third-party and build a current Python with it, it would be good if test_gdb passed.  However, the log file you attached hints that gdb may not be functional, at least with the Homebrew Python you appear to be using (built with Clang); note the'Unable to find Mach task port' message.  Can you verify that the gdb you are using does or does not work with the Python in question, perhaps by trying some of the examples in the Developer's Guide (https://docs.python.org/devguide/gdb.html)?

There is an open earlier issue about test_gdb failures on OS X with Homebrew.  Closing this issue in favor of that one.