diff --git a/CLAUDE.md b/CLAUDE.md
index 71e42849a3..2898b71a13 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -8,7 +8,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 Perry is a native TypeScript compiler written in Rust that compiles TypeScript source code directly to native executables. It uses SWC for TypeScript parsing and LLVM for code generation.
 
-**Current Version:** 0.5.1337
+**Current Version:** 0.5.1338
 
 
 ## TypeScript Parity Status
diff --git a/Cargo.lock b/Cargo.lock
index 2793db161f..b6a75fc249 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5547,7 +5547,7 @@ checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
 [[package]]
 name = "perry"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "base64",
@@ -5607,14 +5607,14 @@ dependencies = [
 
 [[package]]
 name = "perry-api-manifest"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "perry-audio-miniaudio"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "cc",
  "libc",
@@ -5622,7 +5622,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "inkwell",
@@ -5639,7 +5639,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-arkts"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5647,7 +5647,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-glance"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5655,7 +5655,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-js"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-dispatch",
@@ -5664,7 +5664,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-swiftui"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5672,7 +5672,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wasm"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "base64",
@@ -5684,7 +5684,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wear-tiles"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5692,7 +5692,7 @@ dependencies = [
 
 [[package]]
 name = "perry-container-compose"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -5721,14 +5721,14 @@ dependencies = [
 
 [[package]]
 name = "perry-container-e2e"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
 ]
 
 [[package]]
 name = "perry-diagnostics"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "serde",
  "serde_json",
@@ -5736,7 +5736,7 @@ dependencies = [
 
 [[package]]
 name = "perry-dispatch"
-version = "0.5.1337"
+version = "0.5.1338"
 
 [[package]]
 name = "perry-doc-fixture-my-bindings"
@@ -5747,7 +5747,7 @@ dependencies = [
 
 [[package]]
 name = "perry-doc-tests"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "clap",
@@ -5762,7 +5762,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ads"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "block2",
  "objc2",
@@ -5772,7 +5772,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-argon2"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "argon2",
  "perry-ffi",
@@ -5780,7 +5780,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-axios"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "reqwest",
@@ -5789,7 +5789,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-bcrypt"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bcrypt",
  "perry-ffi",
@@ -5797,7 +5797,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-better-sqlite3"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "rusqlite",
@@ -5805,7 +5805,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cheerio"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "scraper",
@@ -5813,7 +5813,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-commander"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5821,7 +5821,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cron"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "chrono",
  "cron",
@@ -5831,7 +5831,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dayjs"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5839,7 +5839,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-decimal"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "rust_decimal",
@@ -5847,7 +5847,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dotenv"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "serde_json",
@@ -5855,7 +5855,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ethers"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "rand 0.10.1",
@@ -5863,7 +5863,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-events"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5871,14 +5871,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-exponential-backoff"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-fastify"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bytes",
  "http-body-util",
@@ -5896,7 +5896,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-fetch"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bytes",
  "lazy_static",
@@ -5909,7 +5909,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-http"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bytes",
  "h2",
@@ -5933,7 +5933,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ioredis"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5943,7 +5943,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-jsonwebtoken"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "jsonwebtoken",
@@ -5954,7 +5954,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-lru-cache"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "lru",
  "perry-ffi",
@@ -5963,7 +5963,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-moment"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5971,7 +5971,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mongodb"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bson",
  "futures-util",
@@ -5983,7 +5983,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mysql2"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5993,7 +5993,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nanoid"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "nanoid",
  "perry-ffi",
@@ -6002,7 +6002,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-net"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "bytes",
  "perry-ffi",
@@ -6015,7 +6015,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-node-forge"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "const-oid 0.9.6",
  "der 0.7.10",
@@ -6034,7 +6034,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nodemailer"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "lettre",
  "perry-ffi",
@@ -6044,7 +6044,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pdf"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "printpdf",
@@ -6052,7 +6052,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pg"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "sqlx",
@@ -6061,7 +6061,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ratelimit"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "governor",
  "perry-ffi",
@@ -6069,7 +6069,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-sharp"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "fast_image_resize",
  "image",
@@ -6079,14 +6079,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-slugify"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-streams"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -6095,7 +6095,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-undici"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -6104,7 +6104,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-uuid"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "uuid",
@@ -6112,7 +6112,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-validator"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ffi",
  "regex",
@@ -6122,7 +6122,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ws"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "futures-util",
  "lazy_static",
@@ -6135,7 +6135,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-zlib"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "brotli",
  "flate2",
@@ -6145,7 +6145,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ffi"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "dashmap",
  "once_cell",
@@ -6154,7 +6154,7 @@ dependencies = [
 
 [[package]]
 name = "perry-hir"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-api-manifest",
@@ -6172,7 +6172,7 @@ dependencies = [
 
 [[package]]
 name = "perry-parser"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-diagnostics",
@@ -6184,7 +6184,7 @@ dependencies = [
 
 [[package]]
 name = "perry-runtime"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "base64",
@@ -6226,14 +6226,14 @@ dependencies = [
 
 [[package]]
 name = "perry-runtime-static"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-runtime",
 ]
 
 [[package]]
 name = "perry-stdlib"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "aes 0.8.4",
  "aes 0.9.1",
@@ -6328,14 +6328,14 @@ dependencies = [
 
 [[package]]
 name = "perry-stdlib-static"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-stdlib",
 ]
 
 [[package]]
 name = "perry-transform"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -6344,14 +6344,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ui-model",
 ]
 
 [[package]]
 name = "perry-ui-android"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "itoa",
@@ -6368,7 +6368,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-geisterhand"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "rand 0.10.1",
  "serde",
@@ -6378,7 +6378,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-gtk4"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "cairo-rs 0.22.0",
@@ -6401,7 +6401,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-ios"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "block2",
@@ -6417,7 +6417,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-macos"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "block2",
@@ -6432,7 +6432,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-model"
-version = "0.5.1337"
+version = "0.5.1338"
 
 [[package]]
 name = "perry-ui-test"
@@ -6443,11 +6443,11 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-testkit"
-version = "0.5.1337"
+version = "0.5.1338"
 
 [[package]]
 name = "perry-ui-tvos"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "block2",
@@ -6463,7 +6463,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-visionos"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "block2",
@@ -6479,7 +6479,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-watchos"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "block2",
  "libc",
@@ -6492,7 +6492,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "base64",
  "libc",
@@ -6509,14 +6509,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows-winui"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "perry-ui-windows",
 ]
 
 [[package]]
 name = "perry-updater"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "anyhow",
  "base64",
@@ -6532,7 +6532,7 @@ dependencies = [
 
 [[package]]
 name = "perry-wasm-host"
-version = "0.5.1337"
+version = "0.5.1338"
 dependencies = [
  "wasmi",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 40d624c389..0070cc4e0c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -315,7 +315,7 @@ codegen-units = 16
 codegen-units = 16
 
 [workspace.package]
-version = "0.5.1337"
+version = "0.5.1338"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/PerryTS/perry"
diff --git a/changelog.d/7594-survivor-promotion-handoff-livelock.md b/changelog.d/7594-survivor-promotion-handoff-livelock.md
new file mode 100644
index 0000000000..1569956079
--- /dev/null
+++ b/changelog.d/7594-survivor-promotion-handoff-livelock.md
@@ -0,0 +1,31 @@
+**perf(gc): break the survivor-promotion handoff livelock (#7592)**
+
+`copied_minor_promotion_handoff_due` replaces a minor collection with a full
+mark-sweep to make room in old-gen for survivors about to be promoted. But a
+full mark-sweep is non-moving — it promotes nothing — so it cannot relieve the
+pressure that scheduled it: the survivor space still holds the same bytes, the
+reclaim baseline it resets does not count them, and the predicate is true again
+at the very next minor. The copying minor that would have performed the
+promotion never ran.
+
+Measured on `json_pipeline` at 200k records: 19 of 22 collections were
+`survivor_promotion_bytes` fulls, each freeing 0.0 MB at ~400 ms — 7.6 s of an
+8.6 s phase, with peak RSS the same whether they ran or not.
+
+Latched to one handoff per copying minor: the handoff makes room, the copying
+minor performs the promotion that consumes it. The latch clears only on a
+*copying* minor, since a non-moving minor fallback promotes nothing and would
+reinstate the livelock at half rate. The guard precedes the
+`copied_minor_promotable_active_survivor_bytes()` walk, so a suppressed handoff
+also skips that O(n) survivor pass.
+
+The same workload now runs 6 collections instead of 22, with the copying minor
+promoting 110 MB. `build_out` at 500k records goes 57,242 ms → 10,551 ms
+(5.4×), output hash identical; peak RSS rises 17–24 % at the large sizes,
+because the run performs fewer collections.
+
+Confined to workloads that hit the livelock: measuring both arms back to back on
+one host (the pinned ratchet baseline is from 0.5.1315 on another machine and
+cannot separate this change from drift), all 12 probes agree on every semantic
+counter across 144 metric medians, with only ungated RSS/wall cells moving, all
+≤ 0.12 %.
diff --git a/crates/perry-runtime/src/gc/copying.rs b/crates/perry-runtime/src/gc/copying.rs
index 18f0691192..f5f0ea54e1 100644
--- a/crates/perry-runtime/src/gc/copying.rs
+++ b/crates/perry-runtime/src/gc/copying.rs
@@ -1276,6 +1276,9 @@ pub(super) fn gc_collect_minor_copying_fast_path_with_eligibility(
         trace.pause_us = start.elapsed().as_micros() as u64;
         trace.capture_layout_scans();
     }
+    // #7592: this is the promotion the survivor-promotion handoff exists to
+    // enable, so it releases the latch that suppressed a repeat handoff.
+    note_copying_minor_completed();
     maybe_schedule_old_reclaim_after_copied_minor();
     retune_after_scavenge(
         collector.stats.eden_live_bytes,
diff --git a/crates/perry-runtime/src/gc/mod.rs b/crates/perry-runtime/src/gc/mod.rs
index 546f231b73..b6d9537464 100644
--- a/crates/perry-runtime/src/gc/mod.rs
+++ b/crates/perry-runtime/src/gc/mod.rs
@@ -176,6 +176,11 @@ pub(super) fn gc_collect_minor_with_trigger(trigger: GcTriggerSnapshot) -> GcCol
         prev & GC_FLAG_IN_ALLOC
     });
     if copied_minor_promotion_handoff_due(trigger.kind) {
+        // #7592: latch before running it. This full is non-moving and promotes
+        // nothing, so it cannot relieve the survivor pressure that scheduled
+        // it; without the latch the predicate is still true at the next minor
+        // and the collector livelocks on fulls that free nothing.
+        note_survivor_promotion_handoff_full();
         let outcome = gc_collect_full_mark_sweep_with_trigger(GcTriggerSnapshot::capture(
             GcTriggerKind::SurvivorPromotionBytes,
         ));
diff --git a/crates/perry-runtime/src/gc/policy.rs b/crates/perry-runtime/src/gc/policy.rs
index 77a5bb494e..3d47859afa 100644
--- a/crates/perry-runtime/src/gc/policy.rs
+++ b/crates/perry-runtime/src/gc/policy.rs
@@ -774,6 +774,13 @@ thread_local! {
     /// `gc_check_trigger`: the full collection must not recursively trigger
     /// another reclaim if a hook it runs allocates.
     pub(super) static GC_OLD_RECLAIM_IN_PROGRESS: Cell<bool> = const { Cell::new(false) };
+    /// #7592: a survivor-promotion handoff full has run and the copying minor
+    /// it was scheduled for has not. See
+    /// `survivor_promotion_handoff_awaiting_minor`.
+    static SURVIVOR_HANDOFF_AWAITING_MINOR: Cell<bool> = const { Cell::new(false) };
+    /// Count of handoffs the latch has suppressed — see
+    /// `survivor_promotion_handoff_suppressions`.
+    static SURVIVOR_HANDOFF_SUPPRESSIONS: Cell<u64> = const { Cell::new(0) };
     /// Phase 2/3 of the moving-GC project: set when an alloc-point nursery
     /// trigger fires while moving mode is on, deferring the collection to the
     /// next precise-root safepoint (event-loop boundary or a codegen loop
@@ -1214,6 +1221,46 @@ pub(super) fn copied_minor_promotable_active_survivor_bytes() -> usize {
     promotable
 }
 
+/// #7592: whether a survivor-promotion handoff full has run without the copying
+/// minor it exists to enable having run since.
+///
+/// The handoff replaces a minor with a full mark-sweep to make room in old-gen
+/// for survivors that are about to be promoted. But a full mark-sweep is
+/// **non-moving — it promotes nothing**, so it cannot itself relieve the
+/// pressure it was scheduled for: the survivor space still holds the same
+/// bytes, the reclaim baseline it resets does not count them, and the predicate
+/// is immediately true again. Without this latch the next minor is intercepted
+/// too, and the collector livelocks on full collections that free nothing —
+/// measured on #7592's `json_pipeline` as 19 consecutive fulls, each freeing
+/// 0.0 MB at ~400 ms, which was 7.6 s of an 8.6 s phase.
+///
+/// One handoff per copying minor is the invariant: the handoff makes room, the
+/// minor does the promotion that consumes it.
+pub(super) fn survivor_promotion_handoff_awaiting_minor() -> bool {
+    SURVIVOR_HANDOFF_AWAITING_MINOR.with(Cell::get)
+}
+
+pub(super) fn note_survivor_promotion_handoff_full() {
+    SURVIVOR_HANDOFF_AWAITING_MINOR.with(|flag| flag.set(true));
+}
+
+/// How many handoffs the latch has suppressed. Every one of these was a full
+/// mark-sweep that would have freed nothing — on `main` this counter would have
+/// read 18 for #7592's 200k `json_pipeline` run. It exists so the suppression
+/// itself is observable: the latch short-circuits before the arena inspection,
+/// so a test with an empty heap cannot otherwise distinguish "suppressed" from
+/// "there was no pressure anyway".
+pub(super) fn survivor_promotion_handoff_suppressions() -> u64 {
+    SURVIVOR_HANDOFF_SUPPRESSIONS.with(Cell::get)
+}
+
+/// Clear the latch — called only when a *copying* minor completes, since only
+/// that collector promotes. A non-moving minor fallback promotes nothing, so
+/// re-arming on one would reinstate the livelock at half rate.
+pub(super) fn note_copying_minor_completed() {
+    SURVIVOR_HANDOFF_AWAITING_MINOR.with(|flag| flag.set(false));
+}
+
 pub(super) fn copied_minor_promotion_handoff_due(trigger_kind: GcTriggerKind) -> bool {
     if !matches!(
         trigger_kind,
@@ -1221,6 +1268,13 @@ pub(super) fn copied_minor_promotion_handoff_due(trigger_kind: GcTriggerKind) ->
     ) {
         return false;
     }
+    // A handoff full has already run and promoted nothing; let the copying
+    // minor it was scheduled for actually happen (#7592). Placed before the
+    // survivor walk below so a suppressed handoff also skips that O(n) pass.
+    if survivor_promotion_handoff_awaiting_minor() {
+        SURVIVOR_HANDOFF_SUPPRESSIONS.with(|n| n.set(n.get().saturating_add(1)));
+        return false;
+    }
     if crate::arena::copying_active_survivor_in_use_bytes()
         < gc_copy_promotion_handoff_min_dyn_bytes()
     {
diff --git a/crates/perry-runtime/src/gc/tests/triggers.rs b/crates/perry-runtime/src/gc/tests/triggers.rs
index 28e5f1fbed..84be4a90bb 100644
--- a/crates/perry-runtime/src/gc/tests/triggers.rs
+++ b/crates/perry-runtime/src/gc/tests/triggers.rs
@@ -224,6 +224,62 @@ fn test_copying_minor_promotion_handoff_uses_predicted_old_pressure() {
     ));
 }
 
+/// #7592: a handoff full must not repeat without the copying minor it exists to
+/// enable.
+///
+/// The handoff replaces a minor with a full mark-sweep to make room for
+/// survivors about to be promoted, but a full mark-sweep is non-moving and
+/// promotes nothing — so it cannot relieve the pressure that scheduled it, and
+/// the predicate is true again at the next minor. Without the latch that is a
+/// livelock: json_pipeline at 200k records ran 19 consecutive
+/// `survivor_promotion_bytes` fulls, each freeing 0.0 MB at ~400 ms.
+///
+/// The latch short-circuits before any arena inspection, so this asserts the
+/// suppression itself rather than reproducing the heap state that arms it.
+#[test]
+fn test_survivor_promotion_handoff_waits_for_the_copying_minor() {
+    let _guard = GcTestIsolationGuard::new();
+
+    note_copying_minor_completed();
+    assert!(
+        !survivor_promotion_handoff_awaiting_minor(),
+        "latch must start clear"
+    );
+
+    note_survivor_promotion_handoff_full();
+    assert!(survivor_promotion_handoff_awaiting_minor());
+    // Assert the SUPPRESSION, not just the `false`. With an empty heap the
+    // predicate returns false at the survivor-occupancy check regardless, so a
+    // bare `assert!(!due)` passes with the latch deleted — it would be a test
+    // that cannot fail. The counter only moves if the latch branch ran.
+    for kind in [GcTriggerKind::ArenaBytes, GcTriggerKind::MallocCount] {
+        let before = survivor_promotion_handoff_suppressions();
+        assert!(
+            !copied_minor_promotion_handoff_due(kind),
+            "a second handoff must be suppressed while the first still awaits \
+             its copying minor ({kind:?})"
+        );
+        assert_eq!(
+            survivor_promotion_handoff_suppressions(),
+            before + 1,
+            "the latch branch must be what rejected it ({kind:?})"
+        );
+    }
+    // A trigger kind the handoff never applies to must not be counted as a
+    // latch suppression — it is rejected earlier, on its own merits.
+    let before = survivor_promotion_handoff_suppressions();
+    assert!(!copied_minor_promotion_handoff_due(GcTriggerKind::Direct));
+    assert_eq!(survivor_promotion_handoff_suppressions(), before);
+
+    // Only a COPYING minor clears it: a non-moving minor fallback promotes
+    // nothing and would reinstate the livelock at half rate.
+    note_copying_minor_completed();
+    assert!(
+        !survivor_promotion_handoff_awaiting_minor(),
+        "the copying minor consumes the handoff"
+    );
+}
+
 // 2026-07-09 audit (device-blind policy): budget-scaled threshold math.
 #[test]
 fn test_budget_scaled_clamps_only_under_budget() {