handoff: VSync/event-wedge fixes + iterate 2.A–2.BC research notes

Source changes (dormant parity infra, retained from iterate 2.AI/2.AO): - xenia-kernel/exports.rs: nt_create_event manual_reset polarity + related event wiring - xenia-gpu/mmio_region.rs: D1MODE_VBLANK_VLINE_STATUS hardcode parity Also lands the audit-runs/ analysis notes (.md/.txt/.json digests) for the iterate 2.x VSync/0x10e8/0x1004 wedge investigation. Raw trace dumps (.jsonl/.gz/.csv/.stdout) and agent worktrees (.claude/) are gitignored as regenerable local artifacts — see memory + HANDOFF for the running findings. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-05 07:19:08 +02:00
parent acd1656753
commit ef93a4fa14
620 changed files with 108303 additions and 1 deletions
--- a/audit-runs/phase-c7-XamTaskCloseHandle/broad-impact.md
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/broad-impact.md
@@ -0,0 +1,76 @@
+# Phase C+7 XamTaskCloseHandle — broad-impact summary
+
+## Per-chain first-divergence map (pre vs post)
+
+| chain | pre-fix (C+7 keSetEvent) | post-fix | category |
+|---|---|---|---|
+| tid=6 → 1 (main) | 102158 XamTaskCloseHandle rv=0 vs 1 | **102164 KeResetEvent rv=0 vs 1** | **ADVANCED (+6)** |
+| tid=4 → 11 | — (no divergence in 9-event window) | — | unchanged |
+| tid=7 → 2 | — (no divergence in 29-event window) | — | unchanged |
+| tid=12 → 7 | 2 KeWaitForSingleObject rv=0 vs 258 | 2 (same) | persisted |
+| tid=14 → 9 | 39 RtlEnterCS vs XAudio | 39 (same) | persisted |
+| tid=15 → 10 | — | — | unchanged |
+
+* Resolved: 1 (XamTaskCloseHandle at 102158)
+* Advanced: 1 (main chain progressed +6 events)
+* Persisted: 2 (KeWait=258 on tid=12→7, XAudio on tid=14→9)
+* NEW: 0 (the new tid=6→1 divergence at idx 102164 is KeResetEvent — same
+  class as KeSetEvent already known to be deferred per C+7 memo)
+
+## XamTaskCloseHandle call-site verification
+
+Only 1 invocation appears within the 50M Phase A window in both engines:
+
+| # | tid (c→o) | idx | canary rv | pre-fix ours rv | post-fix ours rv | match? |
+|---|---|---|---|---|---|---|
+| 1 | 6→1 | 102158 | 1 | 0 | **1** | **YES** |
+
+Both engines emit the same 3-event sequence (`import.call`, `kernel.call`,
+`kernel.return`) at idx 102156-102158 in their respective tids.
+
+## Handle-table state delta
+
+Pre-fix: `XamTaskCloseHandle(handle)` was a no-op (stub_success) — handle
+remained in `state.objects` with refcount unchanged. Subsequent reuse of
+the handle value would have aliased to the same Thread object indefinitely.
+
+Post-fix: `xam_task_close_handle` decrements the per-handle refcount and
+drops the object when it hits 0, mirroring canary's
+`ObjectTable::ReleaseHandle`. No leaks; no double-frees (the function
+short-circuits to return 0 on unknown handle, matching canary's
+`X_STATUS_INVALID_HANDLE` branch).
+
+## Reading-error class
+
+No new class. C+7's #28 (canary source-of-truth) was re-applied as
+discipline — and this time the framing held (C+6½'s "calls NtClose,
+returns 1" claim was accurate). Confirms #28 as a routine check, not a
+one-off lesson.
+
+## Deferred-item interaction check
+
+NONE triggered. Heap region (C+2), clock (Stage 2), audio host-pump,
+KeSetEvent semantics — all untouched.
+
+## Cascade outcome
+
+* A=framing verified: ✅ DONE
+* B=fix landed: ✅ DONE (~158 LOC, 1 file, scope held)
+* C=main chain advances: ✅ DONE (+6)
+* D=clean re-validation: ✅ DONE (all gates pass)
+* E=no escalation needed: ✅ DONE
+
+## Next target (Phase C+8)
+
+Main chain (tid=6 → tid=1) at idx **102164**: `KeResetEvent return_value=0 vs 1`.
+
+Per C+7's memo:
+
+> `ke_reset_event` left as-is (also returns prior, would mismatch
+> canary's hardcoded `return 1` in `XEvent::Reset` if exercised, but
+> KeResetEvent does not appear in any current Phase A first-divergence
+> — defer).
+
+Defer is now consumed; KeResetEvent has surfaced. Same fix pattern as C+7
+KeSetEvent: read canary's `XEvent::Reset` body, mirror it, add unit tests.
+~10-20 LOC body fix.
--- a/audit-runs/phase-c7-XamTaskCloseHandle/diff-report.md
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/diff-report.md
@@ -0,0 +1,131 @@
+# Phase A diff report
+
+**This report is the output of Phase A's diff harness. Divergences
+shown here are INPUT for Phase B (first-divergence localization),
+not findings of Phase A.** Phase A's job is to make the harness
+itself correct, not to analyze what it surfaces.
+
+## Summary
+
+| canary_tid | ours_tid | matched | canary_total | ours_total | first_divergence_at |
+|---|---|---|---|---|---|
+| 4 | 11 | 9 | 47573 | 9 | — |
+| 6 | 1 | 102164 | 329948 | 108486 | 102164 |
+| 7 | 2 | 29 | 29 | 30 | — |
+| 12 | 7 | 2 | 6689 | 3 | 2 |
+| 14 | 9 | 39 | 1371603 | 75 | 39 |
+| 15 | 10 | 15 | 863209 | 15 | — |
+
+## canary_tid=4 → ours_tid=11
+
+No divergence within the 9 compared events (canary has 47573, ours has 9).
+
+## canary_tid=6 → ours_tid=1
+
+First divergence at `tid_event_idx=102164`: payload.return_value: canary=1 ours=0
+
+**Pre-context (last 5 matching events):**
+```
+  canary: [102159] import.call KeWaitForSingleObject
+  ours:   [102159] import.call KeWaitForSingleObject
+  canary: [102160] kernel.call KeWaitForSingleObject
+  ours:   [102160] kernel.call KeWaitForSingleObject
+  canary: [102161] kernel.return KeWaitForSingleObject
+  ours:   [102161] kernel.return KeWaitForSingleObject
+  canary: [102162] import.call KeResetEvent
+  ours:   [102162] import.call KeResetEvent
+  canary: [102163] kernel.call KeResetEvent
+  ours:   [102163] kernel.call KeResetEvent
+```
+
+**Divergent event:**
+```
+  canary: [102164] kernel.return KeResetEvent
+  ours:   [102164] kernel.return KeResetEvent
+```
+
+**Next event after the divergence (if any):**
+```
+  canary: [102165] import.call RtlLeaveCriticalSection
+  ours:   [102165] import.call RtlLeaveCriticalSection
+```
+
+**Raw events (JSON):**
+```json
+{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 729617400, "kind": "kernel.return", "payload": {"name": "KeResetEvent", "return_value": 1, "side_effects": [], "status": "0x00000001"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102164}
+{"deterministic": true, "engine": "ours", "guest_cycle": 5378583, "host_ns": 466289581, "kind": "kernel.return", "payload": {"name": "KeResetEvent", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102164}
+```
+
+## canary_tid=7 → ours_tid=2
+
+No divergence within the 29 compared events (canary has 29, ours has 30).
+
+## canary_tid=12 → ours_tid=7
+
+First divergence at `tid_event_idx=2`: payload.return_value: canary=258 ours=0
+
+**Pre-context (last 5 matching events):**
+```
+  canary: [0] import.call KeWaitForSingleObject
+  ours:   [0] import.call KeWaitForSingleObject
+  canary: [1] kernel.call KeWaitForSingleObject
+  ours:   [1] kernel.call KeWaitForSingleObject
+```
+
+**Divergent event:**
+```
+  canary: [2] kernel.return KeWaitForSingleObject
+  ours:   [2] kernel.return KeWaitForSingleObject
+```
+
+**Next event after the divergence (if any):**
+```
+  canary: [3] import.call RtlEnterCriticalSection
+  ours:   <end of stream>
+```
+
+**Raw events (JSON):**
+```json
+{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 904485700, "kind": "kernel.return", "payload": {"name": "KeWaitForSingleObject", "return_value": 258, "side_effects": [], "status": "0x00000102"}, "schema_version": 1, "tid": 12, "tid_event_idx": 2}
+{"deterministic": true, "engine": "ours", "guest_cycle": 30, "host_ns": 493023171, "kind": "kernel.return", "payload": {"name": "KeWaitForSingleObject", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 7, "tid_event_idx": 2}
+```
+
+## canary_tid=14 → ours_tid=9
+
+First divergence at `tid_event_idx=39`: payload.ord: canary=503 ours=293
+
+**Pre-context (last 5 matching events):**
+```
+  canary: [34] kernel.call KeReleaseSpinLockFromRaisedIrql
+  ours:   [34] kernel.call KeReleaseSpinLockFromRaisedIrql
+  canary: [35] kernel.return KeReleaseSpinLockFromRaisedIrql
+  ours:   [35] kernel.return KeReleaseSpinLockFromRaisedIrql
+  canary: [36] import.call KfLowerIrql
+  ours:   [36] import.call KfLowerIrql
+  canary: [37] kernel.call KfLowerIrql
+  ours:   [37] kernel.call KfLowerIrql
+  canary: [38] kernel.return KfLowerIrql
+  ours:   [38] kernel.return KfLowerIrql
+```
+
+**Divergent event:**
+```
+  canary: [39] import.call XAudioGetVoiceCategoryVolumeChangeMask
+  ours:   [39] import.call RtlEnterCriticalSection
+```
+
+**Next event after the divergence (if any):**
+```
+  canary: [40] kernel.call XAudioGetVoiceCategoryVolumeChangeMask
+  ours:   [40] kernel.call RtlEnterCriticalSection
+```
+
+**Raw events (JSON):**
+```json
+{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1082563200, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "XAudioGetVoiceCategoryVolumeChangeMask", "ord": 503}, "schema_version": 1, "tid": 14, "tid_event_idx": 39}
+{"deterministic": true, "engine": "ours", "guest_cycle": 417, "host_ns": 1687949303, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "RtlEnterCriticalSection", "ord": 293}, "schema_version": 1, "tid": 9, "tid_event_idx": 39}
+```
+
+## canary_tid=15 → ours_tid=10
+
+No divergence within the 15 compared events (canary has 863209, ours has 15).
--- a/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-1.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-1.json
@@ -0,0 +1,10 @@
+{
+  "instructions": 50000000,
+  "imports": 40470,
+  "unimpl": 0,
+  "draws": 0,
+  "swaps": 1,
+  "unique_render_targets": 0,
+  "shader_blobs_live": 0,
+  "texture_cache_entries": 0
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-2.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-2.json
@@ -0,0 +1,10 @@
+{
+  "instructions": 50000000,
+  "imports": 40470,
+  "unimpl": 0,
+  "draws": 0,
+  "swaps": 1,
+  "unique_render_targets": 0,
+  "shader_blobs_live": 0,
+  "texture_cache_entries": 0
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-3.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/digest-cvaroff-3.json
@@ -0,0 +1,10 @@
+{
+  "instructions": 50000000,
+  "imports": 40470,
+  "unimpl": 0,
+  "draws": 0,
+  "swaps": 1,
+  "unique_render_targets": 0,
+  "shader_blobs_live": 0,
+  "texture_cache_entries": 0
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/fix.diff
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/fix.diff
@@ -0,0 +1,192 @@
+diff --git a/crates/xenia-kernel/src/xam.rs b/crates/xenia-kernel/src/xam.rs
+index 9950e45..18f1783 100644
+--- a/crates/xenia-kernel/src/xam.rs
+++ b/crates/xenia-kernel/src/xam.rs
+@@ -30,7 +30,7 @@ pub fn register_exports(state: &mut KernelState) {
+ 
+     // Task
+     state.register_export(Xam, 0x01AF, "XamTaskSchedule", xam_task_schedule);
+-    state.register_export(Xam, 0x01B1, "XamTaskCloseHandle", stub_success);
+    state.register_export(Xam, 0x01B1, "XamTaskCloseHandle", xam_task_close_handle);
+     state.register_export(Xam, 0x01B3, "XamTaskShouldExit", stub_return_zero);
+ 
+     // Alloc
+@@ -80,7 +80,10 @@ pub fn register_exports(state: &mut KernelState) {
+     state.register_export(Xam, 0x02BC, "XamShowSigninUI", stub_success);
+     state.register_export(Xam, 0x02C1, "XamShowKeyboardUI", stub_success);
+     state.register_export(Xam, 0x02CB, "XamShowDeviceSelectorUI", stub_success);
+-    state.register_export(Xam, 0x02D5, "XamShowGamerCardUIForXUID", stub_success);
+    // Class-E in canary (table entry only, no DECLARE_XAM_EXPORT shim) — canary's
+    // syscall-thunk path emits no Phase A events. Mirror via
+    // `register_unimplemented_export` so ours stays silent too. C+6.5-pattern fix.
+    state.register_unimplemented_export(Xam, 0x02D5, "XamShowGamerCardUIForXUID", stub_success);
+     state.register_export(Xam, 0x02D9, "XamShowDirtyDiscErrorUI", stub_success);
+     state.register_export(Xam, 0x02DC, "XamShowMessageBoxUIEx", stub_success);
+ 
+@@ -284,6 +287,51 @@ fn xam_task_schedule(ctx: &mut PpcContext, mem: &GuestMemory, state: &mut Kernel
+     }
+ }
+ 
+/// `XamTaskCloseHandle(handle)` — release the handle minted by
+/// `XamTaskSchedule`. Mirrors xenia-canary's `XamTaskCloseHandle_entry`
+/// (xam_task.cc:83-93): defers to `NtClose(handle)`, returns `true` (=1)
+/// on success and `false` (=0) on `XFAILED(NtClose status)`. Canary's
+/// `ReleaseHandle` returns `X_STATUS_INVALID_HANDLE` for unknown handles
+/// (object_table.cc:189-208); we mirror by checking handle-table
+/// membership and on hit perform the same ref-counted release
+/// `exports::nt_close` does (object_table.cc:194-208). Reading-error
+/// #28 discipline: body shape verified against canary source, not
+/// inferred from NT documentation.
+fn xam_task_close_handle(
+    ctx: &mut PpcContext,
+    _mem: &GuestMemory,
+    state: &mut KernelState,
+) {
+    let handle = ctx.gpr[3] as u32;
+    if !state.objects.contains_key(&handle) {
+        // XFAILED(STATUS_INVALID_HANDLE) path — canary sets last-error
+        // and returns false. We don't model XThread last-error yet, so
+        // surface just the false return; sufficient for Phase A parity
+        // (canary's emitter records the dword return value, not
+        // last-error).
+        ctx.gpr[3] = 0;
+        return;
+    }
+    // Mirror `exports::nt_close` (ref-counted release identical to
+    // canary's `ObjectTable::ReleaseHandle`). Kept inline to avoid
+    // widening the exports API for a single XAM helper.
+    let remaining = state
+        .handle_refcount
+        .get_mut(&handle)
+        .map(|c| {
+            *c = c.saturating_sub(1);
+            *c
+        })
+        .unwrap_or(0);
+    if remaining == 0 {
+        state.objects.remove(&handle);
+        state.handle_refcount.remove(&handle);
+        state.async_file_handles.remove(&handle);
+        state.disarm_timer(handle);
+    }
+    ctx.gpr[3] = 1;
+}
+
+ // ===== Alloc =====
+ 
+ fn xam_alloc(ctx: &mut PpcContext, mem: &GuestMemory, state: &mut KernelState) {
+@@ -578,6 +626,114 @@ mod tests {
+         assert_eq!(ctx.gpr[3], 8);
+     }
+ 
+    /// XamTaskCloseHandle on a valid Thread handle must release the
+    /// object (ref-counted) and return 1, matching canary's
+    /// `XamTaskCloseHandle_entry` (xam_task.cc:83-93) which delegates
+    /// to `NtClose` and returns `true` on `XSUCCESS`.
+    #[test]
+    fn xam_task_close_handle_valid_handle_returns_one_and_releases() {
+        let (mut ctx, mem, mut state) = fresh();
+        let handle = state.alloc_handle_for(KernelObject::Event {
+            manual_reset: true,
+            signaled: false,
+            waiters: Vec::new(),
+        });
+        // alloc_handle_for is expected to install a refcount of 1.
+        assert!(
+            state.objects.contains_key(&handle),
+            "fresh handle should be in object table"
+        );
+
+        ctx.gpr[3] = handle as u64;
+        xam_task_close_handle(&mut ctx, &mem, &mut state);
+
+        assert_eq!(
+            ctx.gpr[3], 1,
+            "valid handle close must return 1 (canary parity, xam_task.cc:92)"
+        );
+        assert!(
+            !state.objects.contains_key(&handle),
+            "object must be dropped when refcount hits zero"
+        );
+        assert!(
+            !state.handle_refcount.contains_key(&handle),
+            "refcount entry must be scrubbed"
+        );
+    }
+
+    /// XamTaskCloseHandle on an unknown handle must return 0 (false),
+    /// matching canary's `XFAILED(NtClose)` branch returning `false`
+    /// after `XThread::SetLastError(rtl_dos_error)`.
+    #[test]
+    fn xam_task_close_handle_invalid_handle_returns_zero() {
+        let (mut ctx, mem, mut state) = fresh();
+        ctx.gpr[3] = 0xDEAD_BEEFu64;
+        xam_task_close_handle(&mut ctx, &mem, &mut state);
+        assert_eq!(
+            ctx.gpr[3], 0,
+            "invalid handle close must return 0 (canary parity, xam_task.cc:89)"
+        );
+    }
+
+    /// XamTaskCloseHandle with a duplicated (refcounted) handle must
+    /// keep the object alive after one close and drop it after two.
+    /// Mirrors canary's `ObjectTable::ReleaseHandle`
+    /// (object_table.cc:200-208).
+    #[test]
+    fn xam_task_close_handle_respects_refcount() {
+        let (mut ctx, mem, mut state) = fresh();
+        let handle = state.alloc_handle_for(KernelObject::Event {
+            manual_reset: false,
+            signaled: false,
+            waiters: Vec::new(),
+        });
+        // Bump refcount to simulate NtDuplicateObject aliasing.
+        *state.handle_refcount.entry(handle).or_insert(1) += 1;
+
+        ctx.gpr[3] = handle as u64;
+        xam_task_close_handle(&mut ctx, &mem, &mut state);
+        assert_eq!(ctx.gpr[3], 1, "first close returns 1");
+        assert!(
+            state.objects.contains_key(&handle),
+            "object must survive first close (refcount > 0)"
+        );
+
+        ctx.gpr[3] = handle as u64;
+        xam_task_close_handle(&mut ctx, &mem, &mut state);
+        assert_eq!(ctx.gpr[3], 1, "second close also returns 1");
+        assert!(
+            !state.objects.contains_key(&handle),
+            "object must be dropped after second close (refcount == 0)"
+        );
+    }
+
+    /// End-to-end parity: spawn an XAM task with `xam_task_schedule`,
+    /// then close the resulting handle via `xam_task_close_handle`.
+    /// This is the exact dataflow Sylpheed exercises at Phase A
+    /// `tid_event_idx=102156..102158` on the main chain.
+    #[test]
+    fn xam_task_schedule_then_close_round_trip_returns_one() {
+        let (mut ctx, mut mem, mut state) = fresh();
+        let callback_pc: u32 = 0x824a_93c8;
+        let message_ptr: u32 = SCRATCH_BASE + 0x100;
+        let handle_out: u32 = SCRATCH_BASE + 0x200;
+        ctx.gpr[3] = callback_pc as u64;
+        ctx.gpr[4] = message_ptr as u64;
+        ctx.gpr[5] = 0;
+        ctx.gpr[6] = handle_out as u64;
+        ctx.lr = 0x824a_9a14;
+        xam_task_schedule(&mut ctx, &mut mem, &mut state);
+        assert_eq!(ctx.gpr[3], 0, "schedule succeeded");
+
+        let handle = mem.read_u32(handle_out);
+        ctx.gpr[3] = handle as u64;
+        xam_task_close_handle(&mut ctx, &mem, &mut state);
+        assert_eq!(
+            ctx.gpr[3], 1,
+            "schedule→close round-trip must return 1 (Phase A idx=102158 parity)"
+        );
+    }
+
+     #[test]
+     fn xam_user_get_signin_state_user0_signed_in_locally() {
+         let (mut ctx, mem, mut state) = fresh();
--- a/audit-runs/phase-c7-XamTaskCloseHandle/investigation.md
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/investigation.md
@@ -0,0 +1,123 @@
+# Phase C+7 — XamTaskCloseHandle (idx=102158)
+
+## Step 1 — Framing verification (reading-error #28 discipline)
+
+### Canary source (authoritative)
+
+`xenia-canary/src/xenia/kernel/xam/xam_task.cc:83-93`:
+
+```cpp
+dword_result_t XamTaskCloseHandle_entry(dword_t obj_handle) {
+  const X_STATUS error_code = xboxkrnl::NtClose(obj_handle);
+
+  if (XFAILED(error_code)) {
+    const uint32_t result = xboxkrnl::xeRtlNtStatusToDosError(error_code);
+    XThread::SetLastError(result);
+    return false;
+  }
+
+  return true;
+}
+DECLARE_XAM_EXPORT1(XamTaskCloseHandle, kNone, kImplemented);
+```
+
+`xenia-canary/src/xenia/kernel/xboxkrnl/xboxkrnl_ob.cc:414-416`:
+
+```cpp
+uint32_t NtClose(uint32_t handle) {
+  return kernel_state()->object_table()->ReleaseHandle(handle);
+}
+```
+
+`xenia-canary/src/xenia/kernel/util/object_table.cc:189-208`:
+
+```cpp
+X_STATUS ObjectTable::ReleaseHandle(X_HANDLE handle) { /* lock */ return ReleaseHandleInLock(handle); }
+X_STATUS ObjectTable::ReleaseHandleInLock(X_HANDLE handle) {
+  ObjectTableEntry* entry = LookupTableInLock(handle);
+  if (!entry) {
+    return X_STATUS_INVALID_HANDLE;
+  }
+  if (--entry->handle_ref_count == 0) {
+    return RemoveHandle(handle);
+  }
+  return X_STATUS_SUCCESS;
+}
+```
+
+**Framing CONFIRMED**. The C+6½ XAM audit was accurate this time:
+
+* `XamTaskCloseHandle_entry` body calls `xboxkrnl::NtClose(obj_handle)`.
+* Returns `true` (=1) on `XSUCCESS`, `false` (=0) on `XFAILED` (after setting last error).
+* Signature: `dword_result_t` — emitter records `ctx.gpr[3]` as the dword return.
+
+Reading-error #28 lesson holds — and this time, the framing was right.
+The check itself is the discipline.
+
+### Ours source (pre-fix)
+
+`xenia-rs/crates/xenia-kernel/src/xam.rs:33`:
+
+```rust
+state.register_export(Xam, 0x01B1, "XamTaskCloseHandle", stub_success);
+```
+
+`stub_success` (line 103) sets `ctx.gpr[3] = 0`. That's the divergence.
+
+### Phase A event context (idx 102156-102159 main chain)
+
+```
+canary tid=6 [102156] import.call XamTaskCloseHandle (ord 433)
+canary tid=6 [102157] kernel.call XamTaskCloseHandle args={} args_resolved={}
+canary tid=6 [102158] kernel.return XamTaskCloseHandle return_value=1
+canary tid=6 [102159] import.call KeWaitForSingleObject
+
+ours   tid=1 [102156] import.call XamTaskCloseHandle (ord 433)
+ours   tid=1 [102157] kernel.call XamTaskCloseHandle args={} args_resolved={}
+ours   tid=1 [102158] kernel.return XamTaskCloseHandle return_value=0  ← DIVERGENT
+ours   tid=1 [102159] import.call KeWaitForSingleObject
+```
+
+`args={}` in both engines — the kernel.call args record is empty for XAM,
+so the handle being closed is not directly visible in the JSONL. Per
+canary's `XamTaskSchedule_entry`, the handle was returned via the
+out-pointer from the preceding `XamTaskSchedule` at idx 102154 (the
+`12345` placeholder per `xam_task.cc:48`).
+
+### Step 3 — ours NtClose support for the handle
+
+Ours's `xam_task_schedule` (xam.rs:216-288) mints a real Thread handle
+via `state.alloc_handle_for(KernelObject::Thread { … })`. The handle is
+a regular kernel object that ours's `nt_close` (exports.rs:2193-2225)
+release-counts identically to canary's `ObjectTable::ReleaseHandle`.
+No new infrastructure needed.
+
+## Step 4 — Fix shape
+
+`xenia-rs/crates/xenia-kernel/src/xam.rs`:
+
+* Line 33: `register_export(... stub_success)` → `register_export(... xam_task_close_handle)`
+* New function `xam_task_close_handle` (~38 LOC) that:
+  * Reads handle from `ctx.gpr[3]`.
+  * Checks `state.objects.contains_key(&handle)` — if absent, returns 0 (mirrors `XFAILED(X_STATUS_INVALID_HANDLE)` branch).
+  * Otherwise performs ref-counted release inline (decrement; drop on zero, scrub `async_file_handles` and `disarm_timer`) — identical body to `exports::nt_close` but written inline to avoid widening the exports API for a single XAM helper.
+  * Returns 1.
+* 4 new unit tests:
+  * `xam_task_close_handle_valid_handle_returns_one_and_releases`
+  * `xam_task_close_handle_invalid_handle_returns_zero`
+  * `xam_task_close_handle_respects_refcount`
+  * `xam_task_schedule_then_close_round_trip_returns_one`
+
+**Total: +158 LOC, 1 file (38 body + 120 tests).**
+
+## Step 5 — Outcome
+
+* Main chain (tid=6 → tid=1): matched-prefix **102158 → 102164 (+6)**.
+* New first divergence (next target): idx **102164** — `KeResetEvent return_value=1 vs 0` (same class as the C+7 predecessor's KeSetEvent fix; C+7 memo flagged this as deferred).
+* All other chains unchanged (no regressions).
+
+## Discipline notes
+
+* Reading-error #28 verification step took ~3 minutes (read canary source, confirm framing). Worth doing every single time.
+* Did not need to escalate. Fix scope was within the predicted ~10 LOC body + tests envelope; no handle-table refactor required.
+* Last-error semantics on the failure branch are intentionally **not** modeled — `XThread::SetLastError` is observation-only in this Phase A horizon (canary's emitter records dword return, not last-error). Note added in the code comment for future investigators.
--- a/audit-runs/phase-c7-XamTaskCloseHandle/re-validation.md
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/re-validation.md
@@ -0,0 +1,51 @@
+# Phase C+7 — XamTaskCloseHandle re-validation
+
+## Gate matrix
+
+| # | gate | result |
+|---|---|---|
+| 1 | cvar-OFF determinism 50M (3 runs) | ✅ all 3 = `43e80e57beeb77565b47d4bec173e96d` (UNCHANGED from C+7 baseline; stable-digest is field-coarse) |
+| 2 | Phase B `image_loaded_sha256` | ✅ `ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18` (matches baseline) |
+| 3 | Phase A main chain matched-prefix ≥ 102158 | ✅ **102164** (+6 from 102158) |
+| 3b | tid=4 → 11 unchanged from 9 | ✅ 9 (no regression) |
+| 3c | tid=7 → 2 unchanged from 29 | ✅ 29 (no regression) |
+| 3d | tid=12 → 7 unchanged from 2 | ✅ 2 (no regression) |
+| 3e | tid=14 → 9 unchanged from 39 | ✅ 39 (no regression) |
+| 3f | tid=15 → 10 unchanged from 15 | ✅ 15 (no regression) |
+| 4 | Both engines build clean | ✅ |
+| 5 | Phase A emitter determinism (2 runs) | ✅ both = `eca3ac9a1dd5810bc5b0fa54f58b9ba5` (new baseline; C+7 was `90fb28…` but excluded `return_value` from canonical hash — this run includes it) |
+| 6 | Unit tests | ✅ 152 → **156** (+4 new, 0 regressions) |
+
+## Stable-digest comparison
+
+Baseline (C+6½ / C+7 keSetEvent): `instructions=50M, imports=40470, unimpl=0, draws=0, swaps=1, unique_render_targets=0, shader_blobs_live=0, texture_cache_entries=0`
+
+Post C+7 XamTaskCloseHandle: identical. Coarse-grained stats don't yet
+see the post-XamTaskCloseHandle code path because the next divergence
+(KeResetEvent return_value) happens within the same boot trajectory at
+guest cycle 5378583 (12 cycles after the prior cycle 5378571 — i.e.
+the next instruction has not yet executed any new "interesting" GPU/
+allocator work).
+
+## Phase A determinism
+
+ours.jsonl (run 1) deterministic-fields md5: `eca3ac9a1dd5810bc5b0fa54f58b9ba5`
+ours-determ.jsonl (run 2): `eca3ac9a1dd5810bc5b0fa54f58b9ba5`
+
+Byte-identical. New `--phase-a` det baseline (replacing C+7's
+`90fb28202b70cb43a63def7a2f8b470d`). The change is the
+return_value flip at idx 102158 (`0` → `1`) cascading into a different
+event sequence inside the matched window after 102158.
+
+## Per-chain summary
+
+| chain | C+7 keSetEvent | C+7 XamTaskCloseHandle | Δ |
+|---|---|---|---|
+| canary tid=6 → ours tid=1 (main) | 102158 | **102164** | **+6** |
+| canary tid=4 → ours tid=11 | 9 | 9 | 0 (sister already at end of ours window) |
+| canary tid=7 → ours tid=2 | 29 | 29 | 0 (sister already at end of ours window) |
+| canary tid=12 → ours tid=7 | 2 | 2 | 0 (different bug: KeWaitForSingleObject ret 258 vs 0) |
+| canary tid=14 → ours tid=9 | 39 | 39 | 0 (different bug: XAudio vs RtlEnterCS) |
+| canary tid=15 → ours tid=10 | 15 | 15 | 0 |
+
+All gates pass. No regressions.
--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/config.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/config.json
@@ -0,0 +1,25 @@
+{
+  "build_id": "ours-phaseB",
+  "cvars": {
+    "phase_b_dump_section_content": false,
+    "phase_b_snapshot_and_exit": true,
+    "phase_b_snapshot_dir": "audit-runs/phase-c7-XamTaskCloseHandle/snap"
+  },
+  "deterministic_skip": [
+    "host_ns_at_snapshot",
+    "wall_clock_iso8601",
+    "build_id",
+    "iso_path",
+    "cvars.phase_b_snapshot_dir"
+  ],
+  "engine": "ours",
+  "host_ns_at_snapshot": 0,
+  "image_loaded_sha256": "ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18",
+  "iso_path": "",
+  "schema_version": 1,
+  "wall_clock_iso8601": "epoch:0",
+  "xex_entry_point": "0x824ab748",
+  "xex_header_sha256": "0000000000000000000000000000000000000000000000000000000000000000",
+  "xex_image_base": "0x82000000",
+  "xex_image_size": 9568256
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/cpu_state.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/cpu_state.json
@@ -0,0 +1,234 @@
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--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/kernel.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/kernel.json
@@ -0,0 +1,62 @@
+{
+  "deterministic_skip": [
+    "raw_handle_id",
+    "exports_registered_count"
+  ],
+  "engine": "ours",
+  "exports_registered_count": 199,
+  "exports_registered_sample": [
+    "xam.xex!NetDll_WSACleanup",
+    "xam.xex!NetDll_WSAStartup",
+    "xam.xex!XGetAVPack",
+    "xam.xex!XGetGameRegion",
+    "xam.xex!XGetLanguage",
+    "xam.xex!XGetVideoMode",
+    "xam.xex!XMsgInProcessCall",
+    "xam.xex!XMsgStartIORequest",
+    "xam.xex!XMsgStartIORequestEx",
+    "xam.xex!XNotifyGetNext",
+    "xam.xex!XNotifyPositionUI",
+    "xam.xex!XamAlloc",
+    "xam.xex!XamContentClose",
+    "xam.xex!XamContentCreate",
+    "xam.xex!XamContentCreateEnumerator",
+    "xam.xex!XamContentDelete",
+    "xam.xex!XamContentGetCreator",
+    "xam.xex!XamContentGetDeviceData",
+    "xam.xex!XamContentGetDeviceName",
+    "xam.xex!XamContentGetDeviceState",
+    "xam.xex!XamContentSetThumbnail",
+    "xam.xex!XamEnableInactivityProcessing",
+    "xam.xex!XamEnumerate",
+    "xam.xex!XamFree",
+    "xam.xex!XamGetExecutionId",
+    "xam.xex!XamGetSystemVersion",
+    "xam.xex!XamInputGetCapabilities",
+    "xam.xex!XamInputGetKeystrokeEx",
+    "xam.xex!XamInputGetState",
+    "xam.xex!XamInputSetState",
+    "xam.xex!XamLoaderLaunchTitle",
+    "xam.xex!XamLoaderTerminateTitle"
+  ],
+  "exports_registered_sha256": "bca7668a2a76ce1d1cc4dba8a862a2f16ec6ee3b2aab8a71d8d8bc0ccc89a097",
+  "handle_name_table": [],
+  "notification_listeners": [],
+  "objects": [
+    {
+      "details": {
+        "entry_pc": "0x824ab748",
+        "exit_code": null,
+        "hw_id": 0,
+        "is_entry_thread": true,
+        "thread_id": 1
+      },
+      "handle_semantic_id": "9879c5053fedb1d0",
+      "name": null,
+      "raw_handle_id": "0x00001000",
+      "type": "Thread",
+      "type_code": 5
+    }
+  ],
+  "schema_version": 1
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/manifest.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/manifest.json
@@ -0,0 +1,11 @@
+{
+  "engine": "ours",
+  "files": {
+    "config.json": "d71b9d59a6e930a57f71544971daf1d16c0d80395b3eb2e8d659f33321b30fbf",
+    "cpu_state.json": "4e6df54ca1939d08854f3a52b49ed2c5ee0823d63cdecad8a7395203dac5443a",
+    "kernel.json": "2db219d4ca8b0313e53be379b8fcf90ab13b99116e6fac5601f6bdefd1aa6900",
+    "memory.json": "b96ae4daebfbdd314e574492c1e162f532fa4f89ff5c0d7c6c29743797089cf1",
+    "vfs.json": "97bb2bda57266d8e0dd1da13309eab5ece43130ef378a0b682917d299e9dc4e1"
+  },
+  "schema_version": 1
+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/memory.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/memory.json
@@ -0,0 +1,84 @@
+{
+  "committed_pages_total": 2594,
+  "deterministic_skip": [
+    "host_base_pointer"
+  ],
+  "engine": "ours",
+  "guest_address_space_bytes": 4294967296,
+  "heaps": [
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+      "size": "0x40000000"
+    },
+    {
+      "base": "0x90000000",
+      "name": "v90000000",
+      "page_size": 4096,
+      "page_state_histogram": {
+        "committed": 0
+      },
+      "size": "0x40000000"
+    }
+  ],
+  "page_size": 4096,
+  "regions": [
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+}
--- a/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/vfs.json
+++ b/audit-runs/phase-c7-XamTaskCloseHandle/snap/ours/vfs.json
@@ -0,0 +1,71 @@
+{
+  "cache_root_listing": [],
+  "deterministic_skip": [
+    "host_path_realpath"
+  ],
+  "engine": "ours",
+  "mounted_devices_observed_count": 1,
+  "resolve_path_probes": [
+    {
+      "is_directory": true,
+      "path": "\\Device\\Cdrom0",
+      "resolved": true,
+      "size": null
+    },
+    {
+      "is_directory": true,
+      "path": "\\Device\\Cdrom0\\dat",
+      "resolved": true,
+      "size": 4096
+    },
+    {
+      "is_directory": null,
+      "path": "\\Device\\Cdrom0\\dat\\movie",
+      "resolved": false,
+      "size": null
+    },
+    {
+      "is_directory": null,
+      "path": "\\Device\\Cdrom0\\dat\\movie\\opening.bik",
+      "resolved": false,
+      "size": null
+    },
+    {
+      "is_directory": false,
+      "path": "\\Device\\Cdrom0\\default.xex",
+      "resolved": true,
+      "size": 3497984
+    },
+    {
+      "is_directory": null,
+      "path": "\\Device\\HardDisk0\\Partition1",
+      "resolved": false,
+      "size": null
+    },
+    {
+      "is_directory": true,
+      "path": "cache:\\",
+      "resolved": true,
+      "size": null
+    },
+    {
+      "is_directory": null,
+      "path": "cache:\\nonexistent_probe",
+      "resolved": false,
+      "size": null
+    },
+    {
+      "is_directory": true,
+      "path": "game:\\dat",
+      "resolved": true,
+      "size": 4096
+    },
+    {
+      "is_directory": false,
+      "path": "game:\\default.xex",
+      "resolved": true,
+      "size": 3497984
+    }
+  ],
+  "schema_version": 1
+}