Hi, on up-to-date Fedora 35, "test-mdadm.sh" in the libguestfs test suite is failing like this: *stdin*:32: libguestfs: error: md_create: mdadm: r1t2: mdadm: specifying chunk size is forbidden for this level I've searched the web for the error message, but only found <https://bugzilla.redhat.com/show_bug.cgi?id=1984335>. I don't recall this failure from earlier, so it must be something recent. I think the error message may refer to the following command: md-create r1t2 "/dev/sdc1 /dev/sdd1" chunk:65536 This command goes back to historical commit c11a92751e00 ("New API: mdadm-create for creating MD devices.", 2011-11-11). When I prepend SKIP_TEST_MDADM_SH=1 to the "make check" command line, the next test that (unexpectedly) fails is "run-php-tests.sh". Please see the log attached. And, I cannot set a SKIP variable for this test, I think. I'll go ahead and push the common submodule update anyways (5b5fac3e0b10..41126802097f). Thanks, Laszlo