This happens after Benjamin's changes in 83937. Anybody else seeing this? Intel i5 2.4 GHz, Mac OS X 10.8.3, clang $ hg up default $ make distclean $ MACOSX_DEPLOYMENT_TARGET=10.8 ./configure --with-pydebug $ make $ ./python.exe -Wd -m test.regrtest test_exceptions [1/1] test_exceptions Fatal Python error: Segmentation fault Current thread 0x00007fff74254180: File "/Users/ambv/Documents/Projekty/Python/cpython/py34/Lib/test/test_exceptions.py", line 453 in f File "/Users/ambv/Documents/Projekty/Python/cpython/py34/Lib/test/test_exceptions.py", line 453 in f File "/Users/ambv/Documents/Projekty/Python/cpython/py34/Lib/test/test_exceptions.py", line 453 in f ... (repeated a 100 times) Command terminated abnormally. Everything runs fine without --with-pydebug (or before 83937 with --with-pydebug). -- Best regards, Łukasz Langa WWW: http://lukasz.langa.pl/ Twitter: @llanga IRC: ambv on #python-dev