Ned Deily added the comment: I can reproduce a hang (but not a crash) when using a Python 2.7.x or 3.4.x built from source and linking with the OS X 10.9 system libsqlite3. Using the Apple-supplied Python 2.7 on 10.9 causes a crash in libdispatch. Using Python 2.7.6 or 3.4.0 from the current python.org 64-bit installers, the test does not hang; these Pythons are linked with a static local version of libsqlite3, not the system-supplied one. If I modify the test to include a call to sqlite3.connect() in the top-level code before calling multiprocessing apply_async, the test also does not hang anymore. Perhaps you can use that as a workaround. I'm not sure why the combination of sqlite and _tkinter are necessary to hang. I'm not going to have time to look further into this right away.
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