# Autopsy — the permuter's failures, classified

> Generated by `tools/autopsy.py report` from `.run/autopsy/residuals.jsonl` (built by `collect`, which recompiles every open backlog draft through `tools/match_one.py` and classifies the FULL residual with `tools/residual_class.py`).

> A verdict here is a **candidate**, never a bank: the whole-binary byte-gate remains the sole arbiter (G3/P9).

**Corpus:** 1752 record(s) · 1659 classified · status {'near': 1354, 'nobuild': 93, 'match': 305}


## Buckets — what tool each failure actually wants

| bucket | fns | reach-weighted | meaning |
|--------|----:|---------------:|---------|
| redraft | 699 | 2162 | the stored draft is NOT this function — un-attempted work misfiled as a near-miss; route to a fresh crack, not to a wall |
| structural | 578 | 7761 | local mutation CANNOT introduce it — wants a C-level idiom, not CPU |
| integration | 305 | 2303 | byte-correct standalone; blocked on plumbing (§58/§59 reconcile ladder) |
| permuter | 75 | 740 | local mutation CAN reach it — permuter fuel (a plateau here is a **missing-transform** candidate) |
| unknown | 2 | 2 | the residue the LLM tier is for |

## Classes

| class | fns | reach-weighted | bucket | permuter profile |
|-------|----:|---------------:|--------|------------------|
| SIZE-MISMATCH | 699 | 2162 | redraft | — |
| LENGTH-DRIFT | 394 | 6380 | structural | — |
| MATCH | 305 | 2303 | integration | — |
| OPCODE-MIXED | 80 | 878 | structural | — |
| WIDTH | 44 | 310 | structural | — |
| IMM-OFFSET | 38 | 38 | structural | — |
| DELAY-SLOT | 23 | 289 | permuter | schedule |
| BRANCH-POLARITY | 22 | 155 | structural | — |
| REGALLOC-PERM | 18 | 151 | permuter | regalloc |
| ADDRESSING | 17 | 150 | permuter | cse |
| IMM-VALUE | 10 | 143 | permuter | cse |
| SCHEDULE-REORDER | 7 | 7 | permuter | schedule |
| MIXED | 2 | 2 | unknown | — |

## Top clusters (the batch-autopsy work items)

One representative per signature diagnoses the whole cluster — that is what makes the LLM pass a *batch* autopsy rather than N per-function reads.

| # | signature | fns | reach-weighted | example |
|--:|-----------|----:|---------------:|---------|
| 1 | `SIZE-MISMATCH/short` | 604 | 1801 | func_8017E918 (close=4, 2 ins) |
| 2 | `MATCH` | 305 | 2303 | func_80168B70 (close=0, 27 ins) |
| 3 | `LENGTH-DRIFT/-1?` | 116 | 1712 | func_8018312C (close=5, 7 ins) |
| 4 | `SIZE-MISMATCH/long` | 95 | 361 | func_8017E06C (close=6, 9 ins) |
| 5 | `LENGTH-DRIFT/-2?` | 70 | 1268 | func_80190480 (close=3, 4 ins) |
| 6 | `OPCODE-MIXED` | 67 | 599 | func_80161D20 (close=1, 14 ins) |
| 7 | `LENGTH-DRIFT/1?` | 63 | 595 | func_80187074 (close=4, 7 ins) |
| 8 | `LENGTH-DRIFT/2?` | 51 | 450 | func_80181B8C (close=5, 11 ins) |
| 9 | `LENGTH-DRIFT/-7` | 32 | 32 | func_80184590 (close=9, 2 ins) |
| 10 | `LENGTH-DRIFT/+1` | 21 | 21 | func_8017DCE4 (close=3, 8 ins) |
| 11 | `IMM-OFFSET/1` | 17 | 17 | func_801827C4 (close=1, 13 ins) |
| 12 | `DELAY-SLOT/1` | 13 | 146 | func_8016BA68 (close=1, 29 ins) |
| 13 | `BRANCH-POLARITY/bnez!=beqz` | 11 | 144 | func_80185E38 (close=1, 12 ins) |
| 14 | `IMM-VALUE` | 10 | 143 | func_8018A640 (close=2, 4 ins) |
| 15 | `WIDTH/lhu!=lh` | 9 | 9 | func_80142A10 (close=1, 28 ins) |
| 16 | `LENGTH-DRIFT/-3?` | 8 | 1072 | func_8012CC88 (close=13, 102 ins) |
| 17 | `OPCODE-MIXED/addressing,width` | 8 | 274 | func_8017F114 (close=5, 75 ins) |
| 18 | `DELAY-SLOT/2` | 8 | 141 | func_80158638 (close=2, 87 ins) |

## Second oracle — deterministic verdict vs the recorded label

The recorded `klass` is what a wave agent typed months ago; the verdict is derived from today's bytes. Neither is authoritative — **the disagreement is the finding**, and it is exactly the `mis-classified` bucket (a wrongly-labelled residual sends the directed search at the wrong levers, so it plateaus and then reads as a wall).

- labelled records comparable: **4** · agree **3** · disagree **1**

| fn | recorded label | label routes to | measured class | measured routes to |
|----|----------------|-----------------|----------------|--------------------|
| func_801549F8 | `schedule` | schedule | ADDRESSING | cse |