A fairly obvious bug with the list (-l) option of gunzip. In this case, “grandma-new.img” is approximately 320 gigabytes. Compressed down to 46gb. “Uncompressed”, and “ratio” are wrong.

root@xxx:/Virt# gunzip -V

gzip 1.6

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.

root@xxx:/Virt# gunzip -l /video1/grandma-new.img.gz

compressed uncompressed ratio uncompressed_name

46492229886 2245353472 -1970.6% /video1/grandma-new.img

root@xxx:/Virt#