Python 2.6 threading KeyError with Apache

I'm running Apache, installed using macports on OS X, to serve a Django app.

I'm getting many lines in the Apache error_log like these:

[Wed Feb 23 11:35:42 2011] [error] Exception KeyError: KeyError(-1606572256,) in <module 'threading' from '/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.p开发者_如何转开发yc'> ignored

The server doesn't seem to be having noticeable problems while these errors are logged, but it does crash every so often requiring a manual restart - which may or may not be related to these error messages.

Any ideas?

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That bug is almost a year old. Update mod_wsgi.