A brief update:
I can also reproducee the crash on Ubuntu 21.10 / e2fsck 1.46.3:
# e2fsck -v -z e2fsck.undofile.2022-03-20 /dev/mapper/md125_crypt
e2fsck 1.46.3 (27-Jul-2021)
Overwriting existing filesystem; this can be undone using the command:
e2undo e2fsck.undofile.2022-03-20
Public bug reported:
The behavior is reproducable on 18.04 and 20.04 LTS with the following versions
of e2fsck:
* e2fsck 1.44.1 (24-Mar-2018)
* e2fsck 1.45.5 (07-Jan-2020)
Expected behavior occurs when:
* Running e2fsck as a dry run does work fine: It does find quite a few errors
and then
