The bug has been logged on the SF bug tracker list.

Thanks for providing the backtrace, but could you also attach the file whose pattern fails to copy to another document?

The logic is something like this: if what fails for you is some pretty simple and straightforward operation, such as pasting a pattern fill, chances are your document is unusual because otherwise we would have caught this before (and indeed, copying simple patterns across documents works, I just checked it). This means you need to supply your document so we could reproduce it. And if the failure you observe is rare or involves some unusual circumstances, of course you also need to give us the document where this happens. So, in any case, submitting the sample document is a very good idea :)