Yes, I'm afraid that's a known bug, and is a property of the file format, not of gzip itself: the file stores only the low-order 32 bits of the size. For details, please see the thread "RFC: fixing the 32-bit size and time limits in gzip file format" rooted at <http://lists.gnu.org/archive/html/bug-gzip/2010-08/msg00009.html>. (No fix has been implemented.)
- gzip bug Curtis Caravone
- Re: gzip bug Paul Eggert
- Re: gzip bug Paul Eggert