LBF_DST_PINNED
if ((env.flags & LBF_DST_PINNED) && env.imbalance > 0) {
env.flags &= ~LBF_DST_PINNED;
env->flags & (LBF_DST_PINNED | LBF_ACTIVE_LB))
env->flags |= LBF_DST_PINNED;