SRF_PUTAWAY
KKASSERT(sr->flags & SRF_PUTAWAY);
sr->flags &= ~SRF_PUTAWAY;
sr->flags = SRF_ALLOCATED | SRF_PUTAWAY;
KKASSERT((sr->flags & SRF_PUTAWAY) == 0);
sr->flags |= SRF_PUTAWAY;
KKASSERT((sr->flags & SRF_PUTAWAY) == 0);
KKASSERT((sr->flags & SRF_PUTAWAY) == 0);