To me it looks like this is an integer overflow on the uncompressed filesize
druid@#### ~ gzip -l dump.sql.gz compressed uncompressed ratio uncompressed_name 2850064545 1792003237 -59.0% dump.sql druid@#### ~ gzip --version gzip 1.4 Copyright (C) 2007 Free Software Foundation, Inc. Copyright (C) 1993 Jean-loup Gailly. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law. Written by Jean-loup Gailly. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1022287 Title: negative compression ratio if list a big gzip file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gzip/+bug/1022287/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs