mdadm regression tests fail

[Bruce Dubbs <bruce.dubbs@gmail.com>]

I am trying to document the mdadm-4.2 installation procedures for our book,
https://www.linuxfromscratch.org/blfs/view/svn/postlfs/mdadm.html

For testing, I am doing a simple:

    make
    sudo ./test --keep-going --logdir=test-logs --save-logs

But I get failures for about half the tests.

Digging in a bit I just ran:

   sudo ./test --tests=00raid0 --logdir=test-logs

This is the first test that fails.  With some hacking, it appears that the first
portion of this test that fails is:

     mdadm -CR $md0 -e0.90 -l0 -n4 $dev0 $dev1 $dev2 $dev3

This resolves to

     mdadm -CR /dev/md0 -e0.90 -l0 -n4 /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3

There is not a lot of error output in the test, so I manually ran:

     dd if=/dev/zero of=/tmp/mdtest0 count=20000 bs=1K
     losetup /dev/loop0 /tmp/mdtest0

For /dev/loop[0123]

Then I ran

     mdadm -CR /dev/md0 -e0.90 -l0 -n4 /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
     mdadm: 0.90 metadata does not support layouts for RAID0

My question is whether the regression tests in the tarball are valid for mdadm-4.2?

     -- Bruce Dubbs
        linuxfromscratch.org

Note: The kernel is version 5.15.12.