feeds module cannot handle csv files exceeding 8gig?
8388608 bytes is 8MB, not 8GB. 40245470 bytes is &lt; 40MB.

Your PHP settings are limiting the maximum POST content length to 8MB, which is why you're getting the error.

To fix, edit your php.ini file and add/update these lines:

post_max_size=50M
upload_max_filesize=50M