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Proof step 12 from proof wlar-erase-worker-helper (previous step)

wlar[n] = wl-entry(m0, stat0), err = EIO, vtblpnum = vtblpnum0, vtblpnum0 = n, vtblpnum1 = 0, wlar0 = wlar, vtblpnum0 < # wlar, n < # wlar, ubi-io-erase-pre(vtblpnum, apebs) ⊦ [fail_or_success#(; ; err); if err = ESUCCESS then apebs[vtblpnum] := mkpeb(empty, empty, mkempbuf(LEB_SIZE), 0, false) else {choose apeb with ubi-io-peb-inv(apeb) ∧ ¬ apeb.bad ∧ ¬ apeb.vidhdr.valid? in apebs[vtblpnum] := apeb or skip}; wlar[vtblpnum0].ec := wlar[vtblpnum0].ec + 1; if err = ESUCCESS then aubi_io_write_echdr#(vtblpnum0, aechdr(wlar[vtblpnum0].ec); apebs; err) else debug#("ubi: erase of PEB " + vtblpnum0.toString + " failed"); vtblpnum1 := vtblpnum1 + 1; while err ≠ ESUCCESS ∧ vtblpnum1 ≤ UBI_ERASE_RETRIES do {wlar[vtblpnum0].ec := wlar[vtblpnum0].ec + 1; aubi_io_sync_erase#(vtblpnum0; apebs; err); if err = ESUCCESS then aubi_io_write_echdr#(vtblpnum0, aechdr(wlar[vtblpnum0].ec); apebs; err) else debug#("ubi: erase of PEB " + vtblpnum0.toString + " failed"); vtblpnum1 := vtblpnum1 + 1}; if err = ESUCCESS then wlar[vtblpnum0] := wl-entry(wlar[vtblpnum0].ec, free) else {aubi_io_markbad#(vtblpnum0; apebs; err); if err = ESUCCESS then wlar[vtblpnum0] := wl-entry(wlar[vtblpnum0].ec, erroneous) else debug#("ubi: marking PEB " + vtblpnum0.toString + " as bad failed")}] ∃ m, stat. m ≠ 0 ∧ m ≤ UBI_ERASE_RETRIES + 1 ∧ wlar = wlar0[n, wl-entry(m0 + m, stat)]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 13:
wlar[n] = wl-entry(m0, stat0), n < # apebs, n < # wlar, ¬ apebs[n].bad ⊦ [fail_or_success#(; ; err); if err = ESUCCESS then apebs[n] := mkpeb(empty, empty, mkempbuf(LEB_SIZE), 0, false) else {{vtblpnum := n; choose apeb with ubi-io-peb-inv(apeb) ∧ ¬ apeb.bad ∧ ¬ apeb.vidhdr.valid? in apebs[vtblpnum] := apeb} or skip}; wlar1 := wlar[n, wlar[n].ec:= (wlar[n].ec + 1)]; vtblpnum0 := n; if err = ESUCCESS then aubi_io_write_echdr#(vtblpnum0, aechdr(wlar1[vtblpnum0].ec); apebs; err) else debug#("ubi: erase of PEB " + vtblpnum0.toString + " failed"); vtblpnum1 := 1; while err ≠ ESUCCESS ∧ vtblpnum1 ≤ UBI_ERASE_RETRIES do {wlar1[vtblpnum0].ec := wlar1[vtblpnum0].ec + 1; aubi_io_sync_erase#(vtblpnum0; apebs; err); if err = ESUCCESS then aubi_io_write_echdr#(vtblpnum0, aechdr(wlar1[vtblpnum0].ec); apebs; err) else debug#("ubi: erase of PEB " + vtblpnum0.toString + " failed"); vtblpnum1 := vtblpnum1 + 1}; if err = ESUCCESS then wlar1[vtblpnum0] := wl-entry(wlar1[vtblpnum0].ec, free) else {aubi_io_markbad#(vtblpnum0; apebs; err); if err = ESUCCESS then wlar1[vtblpnum0] := wl-entry(wlar1[vtblpnum0].ec, erroneous) else debug#("ubi: marking PEB " + vtblpnum0.toString + " as bad failed")}] ∃ m, stat. m ≠ 0 ∧ m ≤ UBI_ERASE_RETRIES + 1 ∧ wlar1 = wlar[n, wl-entry(m0 + m, stat)]

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ ubi-io-erase-pre(n, apebs) ↔ n < # apebs ∧ ¬ apebs[n].bad; (s)