MLXCX_BUFFER_ON_WQ
ASSERT3U(b0->mlb_state, ==, MLXCX_BUFFER_ON_WQ);
ASSERT3U(buf->mlb_state, ==, MLXCX_BUFFER_ON_WQ);
b->mlb_state = MLXCX_BUFFER_ON_WQ;
b->mlb_state = MLXCX_BUFFER_ON_WQ;
b->mlb_state = MLXCX_BUFFER_ON_WQ;
VERIFY3U(b->mlb_state, ==, MLXCX_BUFFER_ON_WQ);
case MLXCX_BUFFER_ON_WQ: