[Bug 1857914] Re: resize2fs destroy the content of the partition

[Theodore Ts'o]

Can you provide a detailed reproduction instructions --- preferably one
that I can run myself, so I can see exactly is going on?

One thing that would be helpful is whether this can me reproduced
without gpart being part of the mix.  That is, can you do something like
this:

mke2fs -t ext4 /path/to/fs.img 20G
mount -o loop /path/to/fs.img /mnt
<create files, or not, if it's not needed for the repro>
umount /mnt
e2fsck -fy /path/to/fs.img
resize2fs /path/to/fs.img 30G

If it does require gpart being in the mix, this could very much be a
gpart bug, in which case I'll be happy to hand this off to the gpart
maintainer.

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https://bugs.launchpad.net/bugs/1857914

Title:
  resize2fs destroy the content of the partition

Status in e2fsprogs package in Ubuntu:
  New

Bug description:
  Hello
  The used version of ubuntu is 19.10
  So the used version of ubuntu is  GParted 0.32.0
      and   the used of  resize2fs   is  1.45.3 (14-Jul-2019)

  I wanted to shrink by 20 GB the size of an old partition created with
  ubuntu 18.04 and stored on an external hard drive connected by USB3.

  The process says it works perfectly well see attachment file
  But the partition can no longer be mounted. The message is:
  mount: /mnt/sdb2 : wrong fs type, bad option, bad superblock on /dev/sdb2, missing codepage or helper program, or other error.

  if I do the stupidity to launch the fsk command to repair, I find all
  the files and directory in the special directory called Lost + found

  Being able to remake the original content, I have seen four times that
  it gives this unpleasant result.

  It also allows me to change the scenario.
  - If I use an internal disk partition instead of the external disk, you're fine.
  - If I use version 18.04, everything is fine even if I use the external disk
  - If I make a new partition on the external disk in version 19.10, I can shrink also without any problem.

  
  So I think there is a software regression for a very specific context.

  Thanks.

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