test: skip test-loop-block udev part in chroot too

Same reason as containers, need full udev/uevent machinery for this

src/oom/oomd-util.c

@@ -337,6 +337,12 @@ int oomd_kill_by_pgscan_rate(Hashmap *h, const char *prefix, bool dry_run, char
                 if (c->pgscan == 0 && c->current_memory_usage == 0)
                         continue;
 
+                /* First try killing recursively to ensure all child cgroups can be killed. */
+                r = cg_kill_recursive(c->path, /* sig= */ 0, CGROUP_IGNORE_SELF, /* killed_pids= */ NULL,
+                                      /* log_kill= */ NULL, /* userdata= */ NULL);
+                if (r < 0)
+                        continue;
+
                 r = oomd_cgroup_kill(c->path, /* recurse= */ true, /* dry_run= */ dry_run);
                 if (r == -ENOMEM)
                         return r; /* Treat oom as a hard error */
@@ -381,6 +387,12 @@ int oomd_kill_by_swap_usage(Hashmap *h, uint64_t threshold_usage, bool dry_run,
                 if (c->swap_usage <= threshold_usage)
                         continue;
 
+                /* First try killing recursively to ensure all child cgroups can be killed. */
+                r = cg_kill_recursive(c->path, /* sig= */ 0, CGROUP_IGNORE_SELF, /* killed_pids= */ NULL,
+                                      /* log_kill= */ NULL, /* userdata= */ NULL);
+                if (r < 0)
+                        continue;
+
                 r = oomd_cgroup_kill(c->path, /* recurse= */ true, /* dry_run= */ dry_run);
                 if (r == -ENOMEM)
                         return r; /* Treat oom as a hard error */

src/test/test-loop-block.c

@@ -240,8 +240,8 @@ static int run(int argc, char *argv[]) {
         if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0)
                 return log_tests_skipped("not running privileged");
 
-        if (detect_container() > 0)
+        if (detect_container() > 0 || running_in_chroot() > 0)
-                return log_tests_skipped("Test not supported in a container, requires udev/uevent notifications");
+                return log_tests_skipped("Test not supported in a container/chroot, requires udev/uevent notifications");
 
         assert_se(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_EX, &loop) >= 0);