3747 txg commit callbacks don't work
Submitted by:   Will Andrews <willa@spectralogic.com>
Reviewed by:    Matthew Ahrens <mahrens@delphix.com>

*** 415,425 ****
  
                  cb_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
                  list_create(cb_list, sizeof (dmu_tx_callback_t),
                      offsetof(dmu_tx_callback_t, dcb_node));
  
!                 list_move_tail(&tc->tc_callbacks[g], cb_list);
  
                  (void) taskq_dispatch(tx->tx_commit_cb_taskq, (task_func_t *)
                      txg_do_callbacks, cb_list, TQ_SLEEP);
          }
  }
--- 415,425 ----
  
                  cb_list = kmem_alloc(sizeof (list_t), KM_SLEEP);
                  list_create(cb_list, sizeof (dmu_tx_callback_t),
                      offsetof(dmu_tx_callback_t, dcb_node));
  
!                 list_move_tail(cb_list, &tc->tc_callbacks[g]);
  
                  (void) taskq_dispatch(tx->tx_commit_cb_taskq, (task_func_t *)
                      txg_do_callbacks, cb_list, TQ_SLEEP);
          }
  }