Bug 215165

Summary:	[iOS 14] WebKit::WebPage's constructor hangs for 25 seconds on simulator
Product:	WebKit	Reporter:	Ali Juma <ajuma>
Component:	Page Loading	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED INVALID
Severity:	Normal	CC:	ap, beidson, justincohen, rohitrao, ryanhaddad
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Ali Juma

Reported 2020-08-05 06:41:13 PDT

Starting in iOS 14 beta 3 (and also in beta 4), each call to WebKit::WebPage's constructor hangs on the simulator for 25 seconds. This happens in any app embedding a WKWebView, including Safari. The stack is below. The root cause seems to be the call to [AVAudioSession sharedInstance]. #0 0x00000002803376d8 in HALCADClient::ConnectToServer() () #1 0x0000000280304447 in HALSystem::InitializeDevices() () #2 0x0000000280303753 in HALSystem::CheckOutInstance() () #3 0x00000002803032f1 in AudioObjectGetPropertyData () #4 0x00000002a9af6d8b in SimulatorDeviceSettings::GetDeviceIDFromUID_Priv(__CFString const*) () #5 0x00000002a9af677a in SimulatorDeviceSettings::SimulatorReadHardwareSettingsFromURL_Priv(__CFURL const*) () #6 0x00000002a9af6fcc in SimulatorDeviceSettings::SimulatorDeviceSettings(applesauce::dispatch::v1::queue, void () block_pointer) () #7 0x00000002a9af7967 in invocation function for block in AudioSessionClientManager::Instance() () #8 0x000000027e304bb6 in _dispatch_client_callout () #9 0x000000027e306121 in _dispatch_once_callout () #10 0x00000002a9b23266 in invocation function for block in AudioSessionClientManager::CreatePrimaryClient(__CFRunLoop*, __CFString const*, void (*)(void*, unsigned int), void*) () #11 0x000000027e304bb6 in _dispatch_client_callout () #12 0x000000027e313dd9 in _dispatch_lane_barrier_sync_invoke_and_complete () #13 0x00000002a9b22a63 in AudioSessionCreateSession_Priv () #14 0x00000002b733d96e in avfaudio::SessionConnector::Connect(AVAudioSession*, applesauce::CF::ObjectRef<__CFRunLoop*>, AudioSessionType) () #15 0x00000002b7334c7a in -[AVAudioSession initWithSessionType:] () #16 0x00000002b73350de in __32+[AVAudioSession sharedInstance]_block_invoke () #17 0x000000027e304bb6 in _dispatch_client_callout () #18 0x000000027e306121 in _dispatch_once_callout () #19 0x00000002b733509b in +[AVAudioSession sharedInstance] () #20 0x000000028b9b9053 in -[WebCoreAudioCaptureSourceIOSListener initWithCallback:] at /Users/ajuma/syncWebKit/Source/WebCore/platform/mediastream/ios/CoreAudioCaptureSourceIOS.mm:57 #21 0x000000028b9b922f in WebCore::CoreAudioCaptureSourceFactoryIOS::CoreAudioCaptureSourceFactoryIOS() at /Users/ajuma/syncWebKit/Source/WebCore/platform/mediastream/ios/CoreAudioCaptureSourceIOS.mm:87 #22 0x000000028b9b9405 in WebCore::CoreAudioCaptureSourceFactoryIOS::CoreAudioCaptureSourceFactoryIOS() at /Users/ajuma/syncWebKit/Source/WebCore/platform/mediastream/ios/CoreAudioCaptureSourceIOS.mm:88 #23 0x000000028b9ba8ce in WTF::NeverDestroyed<WebCore::CoreAudioCaptureSourceFactoryIOS, WTF::AnyThreadsAccessTraits>::NeverDestroyed<>() at /Users/ajuma/syncWebKit/WebKitBuild/Debug-iphonesimulator/usr/local/include/wtf/NeverDestroyed.h:67 #24 0x000000028b9b96b5 in WTF::NeverDestroyed<WebCore::CoreAudioCaptureSourceFactoryIOS, WTF::AnyThreadsAccessTraits>::NeverDestroyed<>() at /Users/ajuma/syncWebKit/WebKitBuild/Debug-iphonesimulator/usr/local/include/wtf/NeverDestroyed.h:65 #25 0x000000028b9b967d in WebCore::CoreAudioCaptureSourceFactory::singleton() at /Users/ajuma/syncWebKit/Source/WebCore/platform/mediastream/ios/CoreAudioCaptureSourceIOS.mm:101 #26 0x000000028f5d43c1 in WebCore::MockRealtimeAudioSourceFactory::activeSource() at /Users/ajuma/syncWebKit/Source/WebCore/platform/mock/MockRealtimeMediaSourceCenter.cpp:190 #27 0x000000028d61e2e2 in WebCore::MediaStreamTrack::updateCaptureAccordingToMutedState(WebCore::Document&) at /Users/ajuma/syncWebKit/Source/WebCore/Modules/mediastream/MediaStreamTrack.cpp:471 #28 0x000000028e06a2ce in WebCore::Document::pageMutedStateDidChange() at /Users/ajuma/syncWebKit/Source/WebCore/dom/Document.cpp:4223 #29 0x000000028efc9259 in WebCore::Page::setMuted(unsigned int)::$_42::operator()(WebCore::Document&) const at /Users/ajuma/syncWebKit/Source/WebCore/page/Page.cpp:1951 #30 0x000000028efc9213 in WTF::Detail::CallableWrapper<WebCore::Page::setMuted(unsigned int)::$_42, void, WebCore::Document&>::call(WebCore::Document&) at /Users/ajuma/syncWebKit/WebKitBuild/Debug-iphonesimulator/usr/local/include/wtf/Function.h:52 #31 0x000000028ef8164a in WTF::Function<void (WebCore::Document&)>::operator()(WebCore::Document&) const at /Users/ajuma/syncWebKit/WebKitBuild/Debug-iphonesimulator/usr/local/include/wtf/Function.h:84 #32 0x000000028ef73afc in WebCore::Page::forEachDocument(WTF::Function<void (WebCore::Document&)> const&) const at /Users/ajuma/syncWebKit/Source/WebCore/page/Page.cpp:3084 #33 0x000000028ef7c8ca in WebCore::Page::setMuted(unsigned int) at /Users/ajuma/syncWebKit/Source/WebCore/page/Page.cpp:1950 #34 0x00000002719750dc in WebKit::WebPage::setMuted(unsigned int) at /Users/ajuma/syncWebKit/Source/WebKit/WebProcess/WebPage/WebPage.cpp:5134 #35 0x0000000271970bfc in WebKit::WebPage::WebPage(WTF::ObjectIdentifier<WebCore::PageIdentifierType>, WebKit::WebPageCreationParameters&&) at /Users/ajuma/syncWebKit/Source/WebKit/WebProcess/WebPage/WebPage.cpp:687 #36 0x000000027196e975 in WebKit::WebPage::WebPage(WTF::ObjectIdentifier<WebCore::PageIdentifierType>, WebKit::WebPageCreationParameters&&) at /Users/ajuma/syncWebKit/Source/WebKit/WebProcess/WebPage/WebPage.cpp:482 #37 0x000000027196e868 in WebKit::WebPage::create(WTF::ObjectIdentifier<WebCore::PageIdentifierType>, WebKit::WebPageCreationParameters&&) at /Users/ajuma/syncWebKit/Source/WebKit/WebProcess/WebPage/WebPage.cpp:388 #38 0x0000000271492914 in WebKit::WebProcess::createWebPage(WTF::ObjectIdentifier<WebCore::PageIdentifierType>, WebKit::WebPageCreationParameters&&) at /Users/ajuma/syncWebKit/Source/WebKit/WebProcess/WebProcess.cpp:721

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Alexey Proskuryakov

Comment 1 2020-08-05 08:56:38 PDT

Thank you for the report! This is an issue below WebKit, tracked by Apple internally as rdar://problem/65042181

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