4101 metaslab_debug should allow for fine-grained control
4102 space_maps should store more information about themselves
4103 space map object blocksize should be increased
4104 ::spa_space no longer works
4105 removing a mirrored log device results in a leaked object
4106 asynchronously load metaslab
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Sebastien Roy <seb@delphix.com>

@@ -5334,11 +5334,11 @@
                  * If the pool is suspended then fail immediately. Otherwise,
                  * check to see if the pool is making any progress. If
                  * vdev_deadman() discovers that there hasn't been any recent
                  * I/Os then it will end up aborting the tests.
                  */
-                if (spa_suspended(spa)) {
+                if (spa_suspended(spa) || spa->spa_root_vdev == NULL) {
                         fatal(0, "aborting test after %llu seconds because "
                             "pool has transitioned to a suspended state.",
                             zfs_deadman_synctime_ms / 1000);
                         return (NULL);
                 }