| m < # avol, n ≤ # buf, m0 + n ≤ LEB_SIZE, avol[m].mapped?, awbuf-inv(avol, bleb), # lpt = # avol, synced(avol0), adr = adr0, m1 = m2, nx = nx0, lpt0 = lpt, avol0 ↓ avol, ns = ns0 ⊦ ⟨awbuf_read_buf#(m, m0, n, adr0, m2, nx0, avol, lpt, ns0, bleb, isbuf; buf; err)⟩ (synced(avol0) ∧ adr = adr0 ∧ m1 = m2 ∧ nx = nx0 ∧ lpt0 = lpt ∧ avol0 ↓ avol ∧ ns = ns0) |