I'm getting segfaults with a77756e480c2 (thanks to 'hg bisect') on Ubuntu 12.04. I've checked buildbots, but they seem happy.
In test_sys:
test_recursionlimit_recovery (test.test_sys.SysModuleTest) ... Fatal Python error: Segmentation fault
In test_runpy:
test_main_recursion_error (test.test_runpy.RunPathTestCase) ... Fatal Python error: Segmentation fault
I'm also getting the following error with Serhiy's latest patch:
python: Objects/abstract.c:2385: _PyStack_AsDict: Assertion `PyDict_GetItem(kwdict, key) != ((void *)0)' failed.
Aborted (core dumped)
generate-posix-vars failed
make: *** [pybuilddir.txt] Error 1