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.
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https://bugs.launchpad.net/bugs/1022287
Title:
negative compression ratio if list a big gzip file
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