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Proof step 147 from proof refine-write-data-wl (previous step)

apebs[m1] = mkpeb(aehdr, avhdr, buf2, 0, false), pebs[m1] = mkpeb(buf1, 2 * EB_PAGE_SIZE, false), err = err1, n = align↑(datasize(buf, n), EB_PAGE_SIZE), aehdr.valid?, avhdr.valid?, m1 < # apebs, m1 < # pebs, abs(pebs, apebs), abs-peb(mkpeb(buf1, 2 * EB_PAGE_SIZE, false), mkpeb(aehdr, avhdr, buf2, 0, false)), is-aligned(n, EB_PAGE_SIZE), mtd-cons(pebs), ubi-io-inv(apebs), n ≤ LEB_SIZE, n ≤ # buf, ⌊err1⌋ ⊦ ⟨choose buf1 with # buf1 ≤ n ∧ is-aligned(# buf1, EB_PAGE_SIZE) ∧ ( datasize(buf1, # buf1) < datasize(buf, n) ∨ checksum(buf1 + mkempbuf(n - # buf1), datasize(buf, n)) ≠ checksum(buf, datasize(buf, n))) in apebs[m1] := mkpeb(apebs[m1].echdr, apebs[m1].vidhdr, buf1 + mkempbuf(LEB_SIZE - # buf1), # buf1, apebs[m1].bad)⟩ (abs(pebs, apebs) ∧ err1 = err), datasize(buf, n) = 0

Heuristic symbolic execution applied rule choose right

And obtained the following new goals

Rule argument

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