diff --git a/src/test/test-cgroup-util.c b/src/test/test-cgroup-util.c
index 3f91aa6a72d..cdf2ea83d7e 100644
--- a/src/test/test-cgroup-util.c
+++ b/src/test/test-cgroup-util.c
@@ -198,7 +198,14 @@ TEST(get_paths, .sd_booted = true) {
         log_info("Root = %s", a);
 }
 
-TEST(proc) {
+static inline bool hidden_cgroup(const char *p) {
+        assert(p);
+
+        /* Consider top-level cgroup hidden from us */
+        return p[0] == '/' && p[strspn(p, "/")] == '.';
+}
+
+TEST(proc, .sd_booted = true) {
         _cleanup_closedir_ DIR *d = NULL;
         int r;
 
@@ -218,14 +225,24 @@ TEST(proc) {
                 if (pidref_is_kernel_thread(&pid) != 0)
                         continue;
 
-                cg_pidref_get_path(SYSTEMD_CGROUP_CONTROLLER, &pid, &path);
-                cg_pid_get_path_shifted(pid.pid, NULL, &path_shifted);
-                cg_pidref_get_owner_uid(&pid, &uid);
-                cg_pidref_get_session(&pid, &session);
-                cg_pidref_get_unit(&pid, &unit);
-                cg_pid_get_user_unit(pid.pid, &user_unit);
-                cg_pid_get_machine_name(pid.pid, &machine);
-                cg_pid_get_slice(pid.pid, &slice);
+                ASSERT_OK_ZERO(cg_pidref_get_path(SYSTEMD_CGROUP_CONTROLLER, &pid, &path));
+                /* Test may run in a container with supervising/monitor processes that don't belong to our
+                 * cgroup tree (slices/leaves) */
+                if (hidden_cgroup(path))
+                        continue;
+                ASSERT_OK_ZERO(cg_pid_get_path_shifted(pid.pid, NULL, &path_shifted));
+                ASSERT_OK_ZERO(cg_pidref_get_unit(&pid, &unit));
+                ASSERT_OK_ZERO(cg_pid_get_slice(pid.pid, &slice));
+
+                /* Not all processes belong to a specific user or a machine */
+                r = cg_pidref_get_owner_uid(&pid, &uid);
+                ASSERT_TRUE(r == 0 || r == -ENXIO);
+                r = cg_pidref_get_session(&pid, &session);
+                ASSERT_TRUE(r == 0 || r == -ENXIO);
+                r = cg_pid_get_user_unit(pid.pid, &user_unit);
+                ASSERT_TRUE(r == 0 || r == -ENXIO);
+                r = cg_pid_get_machine_name(pid.pid, &machine);
+                ASSERT_TRUE(r == 0 || r == -ENOENT);
 
                 printf(PID_FMT"\t%s\t%s\t"UID_FMT"\t%s\t%s\t%s\t%s\t%s\n",
                        pid.pid,