These problems are fixed upstream.   See:

commit 225e5d093b519f9dbe9fcaacd995426f0e5194f6
Author: Theodore Ts'o <ty...@mit.edu>
Date:   Wed Jul 28 13:51:13 2021 -0400

    e2fsck: fix f_baddotdir failure on big-endian systems
    
    Commit 63f44aafb1f2 ("e2fsck: fix ".." more gracefully if possible")
    changed the check_dot() function to try to avoid resetting the '..'
    entry when the '.' entry is too large..  But if we do that, then on
    big-endian systems, we need to try byte swapping the rest of the
    directory entries, or else the f_baddotdir test will fail on
    big-endian systems.
    
    Also add a check to avoid UBSAN warning when there is not enough space
    at the end of the directory block for a directory entry, and so we can
    potentially overflow some pointer arithmetic when trying to byte swap
    the remainder of the (negative) space in the directory block.
    
    Fixes: 63f44aafb1f2 ("e2fsck: fix ".." more gracefully if possible")
    Signed-off-by: Theodore Ts'o <ty...@mit.edu>

commit 7a97083d4350b93f4055bdd8465667cecbb36438
Author: Theodore Ts'o <ty...@mit.edu>
Date:   Fri Jul 30 12:29:44 2021 -0400

    libext2fs: fix translation of Posix ACL's on big-endian systems
    
    The ACL returned by the kernel in lgetxattr(2) is returned in Little
    Endian, even on Big Endian systems.  Fix the functions
    convert_posix_acl_to_disk_buffer() and convert_disk_buffer_to_posix_acl()
    to work correctly on Big Endian systems.  This fixes a failure of
    the test m_rootdir_acl.
    
    Signed-off-by: Theodore Ts'o <ty...@mit.edu>

As I mentioned responding to another bug report, e2fsprogs's maint
branch is currently in a translation freeze pending an upcoming 1.46.4
release.  PTAL and let me know if you see other issues.   (You probably
don't care for Ubuntu but 1.46.4 should also fix some portability issues
for GNU Hurd.)

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https://bugs.launchpad.net/bugs/1939409

Title:
  merge e2fsprogs 1.46.3-1 from Debian: s390x fails in test f_baddotdir

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