This issue is not dead: test_zlib failed twice on "AMD64 Snow Leopard 3.x" buildbot: build 30 (024967cdc2f0e850f0b338e7593a12d965017a6a, Mar 31 01:40:00 2011) and 44 (ebc03d7e711052c0b196aacdbec6778c0a6d5c0c, Apr 4 10:11:20 2011).

Build 44 has a traceback thanks to faulthandler:
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...
[ 79/354] test_time
[ 80/354] test_zlib
Fatal Python error: Bus error

Traceback (most recent call first):
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/test/test_zlib.py", line 85 in test_big_buffer
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/case.py", line 387 in _executeTestPart
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/case.py", line 442 in run
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/case.py", line 494 in __call__
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/suite.py", line 105 in run
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/suite.py", line 67 in __call__
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/suite.py", line 105 in run
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/unittest/suite.py", line 67 in __call__
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/test/support.py", line 1078 in run
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/test/support.py", line 1166 in _run_suite
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/test/support.py", line 1192 in run_unittest
  File "/Users/pythonbuildbot/buildarea/3.x.hansen-osx-x86/build/Lib/test/test_zlib.py", line 611 in test_main
  File "./Lib/test/regrtest.py", line 1032 in runtest_inner
  File "./Lib/test/regrtest.py", line 826 in runtest
  File "./Lib/test/regrtest.py", line 650 in main
  File "./Lib/test/regrtest.py", line 1607 in <module>
make: *** [buildbottest] Bus error
program finished with exit code 2
elapsedTime=1400.363321
--------------------
http://www.python.org/dev/buildbot/all/builders/AMD64%20Snow%20Leopard%203.x/builds/44/steps/test/logs/stdio

test_zlib.py:85 is the crc32(+4 GB) test:
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# Issue #10276 - check that inputs >=4GB are handled correctly.
class ChecksumBigBufferTestCase(unittest.TestCase):

    def setUp(self):
        with open(support.TESTFN, "wb+") as f:
            f.seek(_4G)
            f.write(b"asdf")
        with open(support.TESTFN, "rb") as f:
            self.mapping = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)

    def tearDown(self):
        self.mapping.close()
        support.unlink(support.TESTFN)

    @unittest.skipUnless(mmap, "mmap() is not available.")
    @unittest.skipUnless(sys.maxsize > _4G, "Can't run on a 32-bit system.")
    @unittest.skipUnless(support.is_resource_enabled("largefile"),
                         "May use lots of disk space.")
    def test_big_buffer(self):
        self.assertEqual(zlib.crc32(self.mapping), 3058686908) <~~~ HERE
        self.assertEqual(zlib.adler32(self.mapping), 82837919)
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