[Webkit-unassigned] [Bug 215158] ResizeObserver appears to not be properly garbage collected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215158

--- Comment #6 from cathiechen <cathiechen at igalia.com> ---
Sorry for the delay.

It seems the snapshot do destroy JSResizeObserver. See

```
#0      0x00000004174e696c in WebCore::JSResizeObserverOwner::finalize(JSC::Handle<JSC::Unknown>, void*) at /Users/cathiechen/cc/source/WebKit/WebKitBuild/Debug/DerivedSources/WebCore/JSResizeObserver.cpp:334
#1      0x0000000435efb44a in JSC::WeakBlock::finalize(JSC::WeakImpl*) at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/WeakSetInlines.h:53
#2      0x0000000435efb4e4 in JSC::WeakBlock::sweep() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/WeakBlock.cpp:87
#3      0x0000000435efbfd2 in JSC::WeakSet::sweep() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/WeakSet.cpp:54
#4      0x0000000435ed134a in JSC::MarkedBlock::Handle::sweep(JSC::FreeList*) at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/MarkedBlock.cpp:391
#5      0x0000000435e39a04 in JSC::BlockDirectory::sweep()::$_7::operator()(unsigned long) const at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/BlockDirectory.cpp:280
#6      0x0000000435e3113c in void WTF::FastBitVectorImpl<JSC::BlockDirectoryBits::BlockDirectoryBitVectorWordView<(JSC::BlockDirectoryBits::Kind)6> >::forEachSetBit<JSC::BlockDirectory::sweep()::$_7>(JSC::BlockDirectory::sweep()::$_7 const&) const at /Users/cathiechen/cc/source/WebKit/WebKitBuild/Debug/usr/local/include/wtf/FastBitVector.h:355
#7      0x0000000435e310b6 in JSC::BlockDirectory::sweep() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/BlockDirectory.cpp:277
#8      0x0000000435ee32e9 in JSC::MarkedSpace::sweepBlocks()::$_9::operator()(JSC::BlockDirectory&) const at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/MarkedSpace.cpp:222
#9      0x0000000435ed3f0e in void JSC::MarkedSpace::forEachDirectory<JSC::MarkedSpace::sweepBlocks()::$_9>(JSC::MarkedSpace::sweepBlocks()::$_9 const&) at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/MarkedSpace.h:241
#10     0x0000000435ed3ec9 in JSC::MarkedSpace::sweepBlocks() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/MarkedSpace.cpp:220
#11     0x0000000435e52f38 in JSC::Heap::sweepSynchronously() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/Heap.cpp:1048
#12     0x0000000435e53494 in JSC::Heap::collectNow(JSC::Synchronousness, JSC::GCRequest) at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/Heap.cpp:1091
#13     0x0000000435e96fec in JSC::HeapSnapshotBuilder::buildSnapshot() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp:73
#14     0x000000043600aa0f in Inspector::InspectorHeapAgent::snapshot() at /Users/cathiechen/cc/source/WebKit/Source/JavaScriptCore/inspector/agents/InspectorHeapAgent.cpp:105
```

I'll check if the Snapshot data is correct later.

@Clark do you meet other problems besides the number of resizeObserver?

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