From fe9d00c9582076b468dcef552da68eec6a05ccab Mon Sep 17 00:00:00 2001
From: thomasmichaelwallace <tom.wallace@devicepilot.com>
Date: Mon, 28 Jun 2021 20:53:38 +0000
Subject: [PATCH] deps: V8: cherry-pick 81181a8ad80a
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Original commit message:

    [JSON] Fix GC issue in BuildJsonObject
    We must ensure that the sweeper is not running or has already swept
    mutable_double_buffer. Otherwise the GC can add it to the free list.

    Bug: v8:11837
    Change-Id: Ifd9cf15f1c94f664fd6489c70bb38b59730cdd78
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2928181
    Commit-Queue: Victor Gomes <victorgomes@chromium.org>
    Reviewed-by: Toon Verwaest <verwaest@chromium.org>
    Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#74859}

Refs: v8/v8@81181a8

PR-URL: https://github.com/nodejs/node/pull/39187
Fixes: https://github.com/nodejs/node/issues/37553
Refs: https://github.com/v8/v8/commit/81181a8
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
---
 common.gypi                     | 2 +-
 deps/v8/src/heap/heap.cc        | 4 ++++
 deps/v8/src/heap/heap.h         | 2 ++
 deps/v8/src/json/json-parser.cc | 5 +++++
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/common.gypi b/common.gypi
index 8b81a0a39dd09d..bb27df43d5cb7c 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.72',
+    'v8_embedder_string': '-node.73',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/src/heap/heap.cc b/deps/v8/src/heap/heap.cc
index 5d5eaae0683b74..62033444ed0427 100644
--- a/deps/v8/src/heap/heap.cc
+++ b/deps/v8/src/heap/heap.cc
@@ -3347,6 +3347,10 @@ void Heap::MakeHeapIterable() {
   mark_compact_collector()->EnsureSweepingCompleted();
 }
 
+void Heap::EnsureSweepingCompleted() {
+  mark_compact_collector()->EnsureSweepingCompleted();
+}
+
 namespace {
 
 double ComputeMutatorUtilizationImpl(double mutator_speed, double gc_speed) {
diff --git a/deps/v8/src/heap/heap.h b/deps/v8/src/heap/heap.h
index b2105a96badc2f..4ca8c3b201fb03 100644
--- a/deps/v8/src/heap/heap.h
+++ b/deps/v8/src/heap/heap.h
@@ -1001,6 +1001,8 @@ class Heap {
       Reservation* reservations, const std::vector<HeapObject>& large_objects,
       const std::vector<Address>& maps);
 
+  void EnsureSweepingCompleted();
+
   IncrementalMarking* incremental_marking() {
     return incremental_marking_.get();
   }
diff --git a/deps/v8/src/json/json-parser.cc b/deps/v8/src/json/json-parser.cc
index da2f60d3209b4a..2ac4e727e0bdb3 100644
--- a/deps/v8/src/json/json-parser.cc
+++ b/deps/v8/src/json/json-parser.cc
@@ -633,6 +633,11 @@ Handle<Object> JsonParser<Char>::BuildJsonObject(
         DCHECK_EQ(mutable_double_address, end);
       }
 #endif
+      // Before setting the length of mutable_double_buffer back to zero, we
+      // must ensure that the sweeper is not running or has already swept the
+      // object's page. Otherwise the GC can add the contents of
+      // mutable_double_buffer to the free list.
+      isolate()->heap()->EnsureSweepingCompleted();
       mutable_double_buffer->set_length(0);
     }
   }