# bash -x reproducer foo31
+ set -e
+ VG=vg
+ NAME=foo31
+ '[' -z foo31 ']'
+ lvcreate -n foo31 -L128M /dev/vg
  /dev/sdb: open failed: No medium found
  Logical volume "foo31" created.
+ mke2fs -F -m0 -b 4096 -t ext4 -O 'resize_inode,^has_journal' -E resize=1073741824 /dev/vg/foo31
mke2fs 1.44.3 (10-July-2018)
Discarding device blocks:  4096/32768           done                            
Creating filesystem with 32768 4k blocks and 32768 inodes

Allocating group tables: 0/1   done                            
Writing inode tables: 0/1   done                            
Writing superblocks and filesystem accounting information: 0/1   done

+ mount /dev/vg/foo31 /mnt
+ lvextend -f --size 1708M /dev/vg/foo31
  /dev/sdb: open failed: No medium found
  Size of logical volume vg/foo31 changed from 128.00 MiB (32 extents) to <1.67 GiB (427 extents).
  Logical volume vg/foo31 successfully resized.
+ df -h /mnt
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/vg-foo31  124M  2.1M  120M   2% /mnt
+ resize2fs /dev/vg/foo31 2361000s
resize2fs 1.44.3 (10-July-2018)
Filesystem at /dev/vg/foo31 is mounted on /mnt; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/vg/foo31 is now 295125 (4k) blocks long.

+ df -h /mnt
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/vg-foo31  1.1G  -16T   17T    - /mnt
+ resize2fs /dev/vg/foo31 3109200s
resize2fs 1.44.3 (10-July-2018)
^C