Unpoison CrossThreadPersistents

third_party/WebKit/Source/platform/heap/PersistentNode.cpp

Index: third_party/WebKit/Source/platform/heap/PersistentNode.cpp
diff --git a/third_party/WebKit/Source/platform/heap/PersistentNode.cpp b/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
index cb47bcf10b39766b61a1f4f99d3d733d0381e78f..af05fd588bd8331c51264dd835b36c5245798589 100644
--- a/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
+++ b/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
@@ -87,6 +87,8 @@ void PersistentRegion::tracePersistentNodes(Visitor* visitor,
     int freeCount = 0;
     for (int i = 0; i < PersistentNodeSlots::slotCount; ++i) {
       PersistentNode* node = &slots->m_slot[i];
+      ASAN_UNPOISON_MEMORY_REGION(node->self(),
+                                  sizeof(CrossThreadPersistent<void*>));

[haraken, 2016/10/17 03:55:22]

Would you help me understand who poisons the memory region of node->self()?

I'm wondering if there's an option to simply stop poisoning heap pages for
CrossThreadPersistents.

       if (node->isUnused()) {
         if (!freeListNext)
           freeListLast = node;