Bug 179200

Summary:	ASSERTION FAILED: isMainThread() : UNEXPECTEDLY EXITED WebKitLegacy.RenderInContextSnapshot
Product:	WebKit	Reporter:	Matt Lewis <jlewis3>
Component:	Web Inspector	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	inspector-bugzilla-changes, joepeck, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Matt Lewis

Reported 2017-11-02 14:18:10 PDT

WebKitLegacy.RenderInContextSnapshot is failing on iOS Simulator Debug consistently. This most likely started with https://trac.webkit.org/changeset/208240/webkit as this was committed around the time of the first assertion failure: https://build.webkit.org/builders/Apple%20iOS%2011%20Simulator%20Debug%20WK2%20%28Tests%29/builds/764 UNEXPECTEDLY EXITED WebKitLegacy.RenderInContextSnapshot 2017-11-01 12:56:20.089 TestWebKitAPI[53126:59098013] Loading file:///Volumes/Data/slave/ios-simulator-11-debug-tests-wk2/build/WebKitBuild/Debug-iphonesimulator/TestWebKitAPI.resources/large-red-square-image.html ASSERTION FAILED: isMainThread() /Volumes/Data/slave/ios-simulator-11-debug/build/Source/WebCore/inspector/InspectorInstrumentation.h(1389) : static WebCore::InstrumentingAgents &WebCore::InspectorInstrumentation::instrumentingAgentsForPage(WebCore::Page &) 1 0x10cc676fd WTFCrash 2 0x11cc5457d WebCore::InspectorInstrumentation::instrumentingAgentsForPage(WebCore::Page&) 3 0x11cc54480 WebCore::InspectorInstrumentation::instrumentingAgentsForPage(WebCore::Page*) 4 0x11cdfe06d WebCore::InspectorInstrumentation::instrumentingAgentsForFrame(WebCore::Frame&) 5 0x11d860365 WebCore::InspectorInstrumentation::didReceiveResourceResponse(WebCore::Frame&, unsigned long, WebCore::DocumentLoader*, WebCore::ResourceResponse const&, WebCore::ResourceLoader*) 6 0x11d8fa432 WebCore::ResourceLoadNotifier::dispatchDidReceiveResponse(WebCore::DocumentLoader*, unsigned long, WebCore::ResourceResponse const&, WebCore::ResourceLoader*) 7 0x11d8fa390 WebCore::ResourceLoadNotifier::didReceiveResponse(WebCore::ResourceLoader*, WebCore::ResourceResponse const&) 8 0x11d900848 WebCore::ResourceLoader::didReceiveResponse(WebCore::ResourceResponse const&) 9 0x11d913e79 WebCore::SubresourceLoader::didReceiveResponse(WebCore::ResourceResponse const&) 10 0x11d901422 WebCore::ResourceLoader::didReceiveResponseAsync(WebCore::ResourceHandle*, WebCore::ResourceResponse&&) 11 0x11df0e5d7 WebCore::ResourceHandle::didReceiveResponse(WebCore::ResourceResponse&&) 12 0x11c265ae0 -[WebCoreResourceHandleAsOperationQueueDelegate connection:didReceiveResponse:]::$_3::operator()() 13 0x11c2656b9 invocation function for block in -[WebCoreResourceHandleAsOperationQueueDelegate connection:didReceiveResponse:]::$_3::operator void () block_pointer() const 14 0x1174b1273 _dispatch_call_block_and_release 15 0x1174b22b5 _dispatch_client_callout 16 0x1174bc496 _dispatch_main_queue_callback_4CF 17 0x116d42ef9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ 18 0x116d07662 __CFRunLoopRun 19 0x116d06a89 CFRunLoopRunSpecific 20 0x116043e5e -[NSRunLoop(NSRunLoop) runMode:beforeDate:] 21 0x10b5ffe73 TestWebKitAPI::Util::run(bool*) 22 0x10b57df4e TestWebKitAPI::WebKitLegacy_RenderInContextSnapshot_Test::TestBody() 23 0x10b68557a testing::Test::Run() 24 0x10b68603d testing::internal::TestInfoImpl::Run() 25 0x10b68708d testing::TestCase::Run() 26 0x10b68d10b testing::internal::UnitTestImpl::RunAllTests() 27 0x10b68cd89 testing::UnitTest::Run() 28 0x10b58b35c TestWebKitAPI::TestsController::run(int, char**) 29 0x10b65a9a0 main 30 0x117526d81 start

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Matt Lewis

Comment 1 2017-11-02 14:23:55 PDT

This was fixed in https://trac.webkit.org/changeset/224348/webkit

Radar WebKit Bug Importer

Comment 2 2017-11-15 12:21:50 PST

<rdar://problem/35567373>

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