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Proof step 4 from proof crash-neutral-write-buf (previous step)

# lpt = # avol, adr = adr0, n0 = n, ns = ns0, nx = nx0, awbuf-inv(avol, bleb), synced(avol0), avol0 ↓ avol, n ≤ # buf, # avol[bleb.leb].data + n ≤ LEB_SIZE ⊦ ⟨if bleb ≠ nobuffer ∧ # avol[bleb.leb].data + n0 ≤ LEB_SIZE ∧ n0 ≤ # buf then if isbuf then err := EROFS else {fail_or_success#(; ; err); let m = bleb.leb in if err = ESUCCESS then avol[m] := mapped(avol[m].data + subarray(buf, 0, n0)) else { choose n with n ≠ 0 ∧ n < n0 ∧ is-aligned(# avol[m].data + n, EB_PAGE_SIZE) in avol[m] := mapped(avol[m].data + subarray(buf, 0, n)) ifnone skip or skip; isbuf := true}} else abort⟩ (avol0 ↓ avol), bleb = nobuffer

Heuristic symbolic execution applied rule if right

And obtained the following new goals

Rule argument

pos: right 1

Additional information