Round-21 pivot of the audit-059 synth-spawn module. Round 20 made the
silph::WorkerCtx workers run by attaching a 32-slot stub sub-vtable
where every entry was a `li r3, 0; blr` stub — workers spawned but
spun forever because slots 15/17 short-circuited to NULL ("no work").
Round 21 reads canary's real sub-vtable VA out of the XEX `.rdata` —
`0x8200A168` — and points `[sub_object + 0]` at it directly. The
vtable bytes live in the static image both engines map, so no guest
memory is consumed and slot 15 (= `sub_824FCCC8`) and slot 17
(= `sub_824FCE38`) — the only slots `sub_82506B08` ever calls —
become working game methods.
Discovery method (canary probes in
`audit-runs/audit-059-handle-disambiguation/round21-subvtable-canary/`):
1. `--audit_jit_prolog_pc=0x82506B08` to catch the first WorkerCtx
virtual-dispatch entry; `[r3+0x2C]` revealed the sub-object VA.
2. Re-run with `--audit_jit_prolog_mem_dump=<sub-obj VA>` to deref
`[sub-object + 0]` = sub-vtable VA = 0x8200A168.
3. PE inspection (`xex-text/xex-rdata` is the static image) reads
all 31 slots; slot 15 -> sub_824FCCC8, slot 17 -> sub_824FCE38.
Smoke metrics (50M instructions, `XENIA_CACHE_PERSIST=1
XENIA_SILPH_SYNTH=1`, audit-runs/audit-059-handle-disambiguation/
round21-real-vtable/):
* 4/4 workers spawned, no crash, no new fault
* KeSetEvent 633885 -> 431860 (-32%)
* KeWaitForSingleObject 258441 -> 185762 (-28%)
* Per-handle state unchanged on the focused stalled set
(0x1020/0x1090 still `<NO_SIGNALS_DESPITE_WAITS>`,
0x12a4/0x12ac/0x1218/0x1224 still `<UNCREATED>`).
* No VdSwap/draws progression observed in this window.
Verdict: B (partial). The workers no longer spin in a stub-loop —
internal call density shifted — but the focused wedge handles still
don't get signalled. Likely root cause: workers may now be waiting
on the WorkerCtx's own KEVENTs (which we synthesised at
+0x54/+0x94) for upstream work that no producer is enqueuing.
Net LOC: 29 ins / 31 del. Tests: workspace passes (lockstep app
tests, kernel 127/127, hir 288/288, scheduler 38/38).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
40f208ea4e