OK I recompiled with "./configure --prefix=/usr/local --enable-shared --with-pydebug" and reran the test, unfortunately...

$ LD_LIBRARY_PATH=/usr/local/src/Python-3.4.3 ./python -m test  test_hash
[1/1] test_hash
1 test OK.


I then applied the patch in msg239385, this resulted in the same crash, I couldn't see any difference in gdb.

I then tried each of the patches in msg239384, with -munaligned-doubles and with -mnounaligned-doubles, again no difference.

I did notice that two tests failed in test_hash prior to the core dump, so here are the outputs from those in case that helps.

<3.4.3 ./python -m test  -v test_hash.DatetimeDatetimeTests test_hash.DatetimeTimeTests
== CPython 3.4.3 (default, Mar 27 2015, 08:45:04) [GCC 4.6.2]
==   Solaris-2.11-sun4v-sparc-32bit-ELF big-endian
==   hash algorithm: fnv 32bit
==   /usr/local/src/Python-3.4.3/build/test_python_10340
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
[1/2] test_hash.DatetimeDatetimeTests
test test_hash.DatetimeDatetimeTests crashed -- Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 2218, in _find_and_load_unlocked
AttributeError: 'module' object has no attribute '__path__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/src/Python-3.4.3/Lib/test/regrtest.py", line 1271, in runtest_inner
    the_module = importlib.import_module(abstest)
  File "/usr/local/src/Python-3.4.3/Lib/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2221, in _find_and_load_unlocked
ImportError: No module named 'test.test_hash.DatetimeDatetimeTests'; 'test.test_hash' is not a package

[2/2/1] test_hash.DatetimeTimeTests
test test_hash.DatetimeTimeTests crashed -- Traceback (most recent call last):
  File "<frozen importlib._bootstrap>", line 2218, in _find_and_load_unlocked
AttributeError: 'module' object has no attribute '__path__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/src/Python-3.4.3/Lib/test/regrtest.py", line 1271, in runtest_inner
    the_module = importlib.import_module(abstest)
  File "/usr/local/src/Python-3.4.3/Lib/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2221, in _find_and_load_unlocked
ImportError: No module named 'test.test_hash.DatetimeTimeTests'; 'test.test_hash' is not a package

2 tests failed:
    test_hash.DatetimeDatetimeTests test_hash.DatetimeTimeTests



Thanks guys!