systemd unit test fails on alpha

[Luca Boccassi <bluca@debian.org>]

Hello Alpha porters,

There's a new unit test in systemd 257, and it consistently fails on
Alpha, but nowhere else. Given there are no porterboxes available, I
am unable to look into it.

Could someone with access to this hardware please debug it and send a
patch to fix it upstream on Github? See all latest build logs:

https://buildd.debian.org/status/logs.php?pkg=systemd&arch=alpha

Thanks!

 994/1688 systemd:test / test-fd-util
     FAIL              0.18s   killed by signal 6 SIGABRT
/* test_fd_get_path */
/* test_fds_are_same_mount */
/* test_dir_fd_is_root */
Failed to acquire mount namespace: Operation not permitted
test-fd-util: Failed to detach mount namespace, skipping tests:
Operation not permitted
/* test_take_fd */
/* test_fd_reopen_condition */
/* test_fd_reopen */
/* test_format_proc_fd_path */
/* test_close_all_fds */
Successfully forked off '(caf-plain)' as PID 1755860.
Skipping PR_SET_MM, as we don't have privileges.
(caf-plain) succeeded.
test-fd-util: Lacking privileges for test with close_range() blocked
and /proc/ overmounted, skipping tests.
/* test_read_nr_open */
nr-open: 1048576
/* test_rearrange_stdio */
Successfully forked off 'rearrange' as PID 1755861.
Skipping PR_SET_MM, as we don't have privileges.
rearrange succeeded.
/* test_fd_move_above_stdio */
/* test_open_serialization_file */
Serializing test to memfd.
/* test_open_serialization_fd */
Serializing test to memfd.
/* test_same_fd */
Assertion 'same_fd(d, e) > 0' failed at src/test/test-fd-util.c:111,
function test_same_fd(). Aborting.