Robert Rohde <ro...@robertrohde.com> added the comment:

It's Windows 7 Ultimate (64-bit) on a very high end system.

I don't think it would be very practical to distribute a 2 GB test file.  
Though I might be able to get it to a couple people if someone wanted to really 
study the issue.

Though if it is an integer overflow (or something like that), then I would 
suspect that GZipFile would show corruption most of the time once the files got 
large enough.  For example, it might occur for all files expanding to larger 
than 2^32 bytes (4 GB).  (That's just speculation, I haven't tested it except 
to note that it failed the very first time I tried to use a file this large.)

Perhaps someone familiar with the code could look for places where integers 
might overflow?

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<http://bugs.python.org/issue10040>
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