[issue6562] OverflowError in RLock.acquire()

[David Roberts]

David Roberts <d at vidr.cc> added the comment:

Yes, it is the PIL library. Removing calls to Image.open() still results
in the same error - the exception is thrown before it even reaches that
bit of the code anyway.

Another odd thing is that the exception is only thrown on some of the
calls to get_tile_path, every second call to be exact - see the attached
log file.

I'm also attaching the relevant code from tilestore.py.

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Added file: http://bugs.python.org/file14567/osm.log

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