Bug 288375 – ASSERTION FAILED: isMainThread() in EffectiveRateChangedListener::stop()

• Component: Media
• Status: RESOLVED FIXED

[Jean-Yves Avenard [:jya]]

https://ews-build.s3-us-west-2.amazonaws.com/macOS-Sequoia-Debug-WK2-Tests-EWS/aa8024db-13636/media/media-vp8-webm-with-poster-crash-log.txt

```
ASSERTION FAILED: isMainThread()
/Volumes/Data/worker/macOS-Sequoia-Debug-Build-EWS/build/WebKitBuild/Debug/usr/local/include/wtf/MainThread.h(81) : void WTF::assertIsMainThread()
1   0x300651ae8 WTF::assertIsMainThread()
2   0x302658c48 WebCore::EffectiveRateChangedListener::stop()
3   0x302658bb8 WebCore::EffectiveRateChangedListener::~EffectiveRateChangedListener()
4   0x302658cdc WebCore::EffectiveRateChangedListener::~EffectiveRateChangedListener()
5   0x3006fc4a4 void WTF::ThreadSafeWeakPtrControlBlock::strongDeref<WebCore::EffectiveRateChangedListener, (WTF::DestructionThread)0>() const::'lambda'()::operator()() const
6   0x3006fc32c void WTF::ThreadSafeWeakPtrControlBlock::strongDeref<WebCore::EffectiveRateChangedListener, (WTF::DestructionThread)0>() const
7   0x3006fc0f0 WTF::ThreadSafeRefCountedAndCanMakeThreadSafeWeakPtr<WebCore::EffectiveRateChangedListener, (WTF::DestructionThread)0>::deref() const
8   0x3006fbfa4 WTF::DefaultRefDerefTraits<WebCore::EffectiveRateChangedListener>::derefIfNotNull(WebCore::EffectiveRateChangedListener*)
9   0x30265fc10 WTF::RefPtr<WebCore::EffectiveRateChangedListener, WTF::RawPtrTraits<WebCore::EffectiveRateChangedListener>, WTF::DefaultRefDerefTraits<WebCore::EffectiveRateChangedListener>>::~RefPtr()
10  0x30265fad0 WTF::RefPtr<WebCore::EffectiveRateChangedListener, WTF::RawPtrTraits<WebCore::EffectiveRateChangedListener>, WTF::DefaultRefDerefTraits<WebCore::EffectiveRateChangedListener>>::~RefPtr()
11  0x302658b0c WebCore::timebaseEffectiveRateChangedCallback(__CFNotificationCenter*, void*, __CFString const*, void const*, __CFDictionary const*)
12  0x18d7d53ac __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
13  0x18d86620c ___CFXRegistrationPost_block_invoke
14  0x18d866154 _CFXRegistrationPost
15  0x18d7a3fac _CFXNotificationPost
16  0x18d7d544c CFNotificationCenterPostNotificationWithOptions
17  0x1988524a8 CMNotificationCenterPostNotification
18  0x1988663a4 figTimebaseReflectNotification
19  0x198857720 fncCallOriginalCallbackAndReleaseWeakListener
20  0x1988575d4 fncHandleWeakNotification
21  0x18d7d53ac __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
22  0x18d86620c ___CFXRegistrationPost_block_invoke
23  0x18d866154 _CFXRegistrationPost
24  0x18d7a3fac _CFXNotificationPost
25  0x18d7d544c CFNotificationCenterPostNotificationWithOptions
26  0x1988524a8 CMNotificationCenterPostNotification
27  0x1988683a8 figTimebaseSetRateAndMaybeAnchorTime
28  0x198867f30 CMTimebaseSetRate
29  0x19dcd9418 FigSampleBufferRenderSynchronizerCreateWithOptions
30  0x19dcd8cb8 FigSampleBufferRenderSynchronizerCreateWithOptions
31  0x19dcd7e18 FigSampleBufferRenderSynchronizerCreateWithOptions
com.apple.WebKit.GPU.Development terminated (pid 64335) for reason: crash
LEAK: 1 WebPageProxy
```

[Radar WebKit Bug Importer]

<rdar://problem/145483109>

[Jean-Yves Avenard [:jya]]

Pull request: https://github.com/WebKit/WebKit/pull/41205

[EWS]

Committed 291013@main (59955e21f6c4): <https://commits.webkit.org/291013@main>

Reviewed commits have been landed. Closing PR #41205 and removing active labels.