Bug 304227 – Regression(303383@main) fast/mediastream/getUserMedia-webaudio.html is a flaky crash

• Component: Web Audio
• Status: RESOLVED FIXED

[Chris Dumez]

fast/mediastream/getUserMedia-webaudio.html is a flaky crash:
```
Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   WebCore                       	       0x3002d37e4 WTFCrashWithInfo(int, char const*, char const*, int) + 100
1   WebCore                       	       0x300a0b984 WTF::CanMakeCheckedPtrBase<std::__1::atomic<unsigned int>, unsigned int, std::__1::atomic<bool>, (WTF::CheckedPtrDeleteCheckException)0>::decrementCheckedPtrCount() const + 132
2   WebCore                       	       0x30468cb24 WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>::derefIfNotNull() + 56
3   WebCore                       	       0x30468cadc WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>::~CheckedPtr() + 32
4   WebCore                       	       0x30467bd54 WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>::~CheckedPtr() + 32
5   WebCore                       	       0x3046dd234 WTF::VectorTypeOperations<WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>>::destruct(WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>*, WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>*) + 64
6   WebCore                       	       0x3046e00d0 WTF::Vector<WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::shrink(unsigned long) + 112
7   WebCore                       	       0x3046dff64 WTF::Vector<WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::shrinkCapacity(unsigned long) + 108
8   WebCore                       	       0x3046a8bc4 WTF::Vector<WTF::CheckedPtr<WebCore::AudioNode, WTF::RawPtrTraits<WebCore::AudioNode>>, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::clear() + 32
9   WebCore                       	       0x3046a8858 WebCore::BaseAudioContext::uninitialize() + 468
10  WebCore                       	       0x30465442c WebCore::AudioContext::uninitialize() + 52
11  WebCore                       	       0x3046a9408 WebCore::BaseAudioContext::stop() + 560
12  WebCore                       	       0x305e61114 _ZZN7WebCore22ScriptExecutionContext20stopActiveDOMObjectsEvENK3$_0clINS_15ActiveDOMObjectEEEDaRT_ + 60
13  WebCore                       	       0x305e6109c WTF::Detail::CallableWrapper<WebCore::ScriptExecutionContext::stopActiveDOMObjects()::$_0, WebCore::ScriptExecutionContext::ShouldContinue, WebCore::ActiveDOMObject&>::call(WebCore::ActiveDOMObject&) + 40
14  WebCore                       	       0x305e3892c WTF::Function<WebCore::ScriptExecutionContext::ShouldContinue (WebCore::ActiveDOMObject&)>::operator()(WebCore::ActiveDOMObject&) const + 184
15  WebCore                       	       0x300066270 WebCore::ScriptExecutionContext::forEachActiveDOMObject(WTF::Function<WebCore::ScriptExecutionContext::ShouldContinue (WebCore::ActiveDOMObject&)> const&) const + 220
16  WebCore                       	       0x30010c4f8 WebCore::ScriptExecutionContext::stopActiveDOMObjects() + 92
17  WebCore                       	       0x30010c454 WebCore::Document::stopActiveDOMObjects() + 76
18  WebCore                       	       0x305b1c368 WebCore::Document::commonTeardown() + 36
19  WebCore                       	       0x305b2d780 WebCore::Document::willBeRemovedFromFrame() + 924
20  WebCore                       	       0x306e4ff30 WebCore::LocalFrame::setView(WTF::RefPtr<WebCore::LocalFrameView, WTF::RawPtrTraits<WebCore::LocalFrameView>, WTF::DefaultRefDerefTraits<WebCore::LocalFrameView>>&&) + 180
21  WebCore                       	       0x306e55d34 WebCore::LocalFrame::createView(WebCore::IntSize const&, std::__1::optional<WebCore::Color> const&, WebCore::IntSize const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) + 288
22  WebKit                        	       0x11e8ebb18 WebKit::WebLocalFrameLoaderClient::transitionToCommittedForNewPage(WebCore::LocalFrameLoaderClient::InitializingIframe) + 1044
23  WebCore                       	       0x3000fb944 WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) + 2488
24  WebCore                       	       0x30001da48 WebCore::FrameLoader::commitProvisionalLoad() + 2088
```

I can reproduce like so:
```
run-webkit-tests --debug --no-build LayoutTests/fast/mediastream/getUserMedia-webaudio.html  --repeat-each=50
```

[Chris Dumez]

Pull request: https://github.com/WebKit/WebKit/pull/55459

[EWS]

Committed 304543@main (8ba228b0d3a9): <https://commits.webkit.org/304543@main>

Reviewed commits have been landed. Closing PR #55459 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/166647583>