[Webkit-unassigned] [Bug 222712] REGRESSION (r272300): [iOS] ASSERTION FAILED: Unsafe to ref/deref from different threads under WebViewLayerFlushScheduler::layerFlushCallback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222712

--- Comment #5 from Antti Koivisto <koivisto at iki.fi> ---
(lldb) p isMainThread()
(bool) $5 = false
(lldb) bt 
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
  * frame #0: 0x0000000142553020 WebKitLegacy`LayerFlushController::ref(this=0x000000015b40f370) const at WebViewData.h:135:36
    frame #1: 0x0000000142552ffe WebKitLegacy`WTF::DefaultRefDerefTraits<LayerFlushController>::refIfNotNull(ptr=0x000000015b40f370) at RefPtr.h:36:18
    frame #2: 0x0000000142552fc4 WebKitLegacy`WTF::RefPtr<LayerFlushController, WTF::RawPtrTraits<LayerFlushController>, WTF::DefaultRefDerefTraits<LayerFlushController> >::RefPtr(this=0x00007ffee4bb8e30, ptr=0x000000015b40f370) at RefPtr.h:61:49
    frame #3: 0x0000000142550b6d WebKitLegacy`WTF::RefPtr<LayerFlushController, WTF::RawPtrTraits<LayerFlushController>, WTF::DefaultRefDerefTraits<LayerFlushController> >::RefPtr(this=0x00007ffee4bb8e30, ptr=0x000000015b40f370) at RefPtr.h:61:47
    frame #4: 0x0000000142550a8d WebKitLegacy`WebViewLayerFlushScheduler::layerFlushCallback(this=0x000000015b40f380) at WebViewData.mm:126:50
    frame #5: 0x0000000142551cf8 WebKitLegacy`WebViewLayerFlushScheduler::WebViewLayerFlushScheduler(this=0x00000001615e1068)::$_0::operator()() const at WebViewData.mm:102:15
    frame #6: 0x0000000142551cae WebKitLegacy`WTF::Detail::CallableWrapper<WebViewLayerFlushScheduler::WebViewLayerFlushScheduler(LayerFlushController*)::$_0, void>::call(this=0x00000001615e1060) at Function.h:52:39
    frame #7: 0x0000000126c7b322 WebCore`WTF::Function<void ()>::operator(this=0x000000015b405a40)() const at Function.h:83:35
    frame #8: 0x000000012a7e8420 WebCore`WebCore::RunLoopObserver::runLoopObserverFired(this=0x000000015b405a38) at RunLoopObserver.cpp:44:5
    frame #9: 0x000000012a7e8380 WebCore`WebCore::RunLoopObserver::runLoopObserverFired((null)=0x00007fda2f31c2d0, (null)=128, context=0x000000015b405a38) at RunLoopObserver.cpp:38:45
    frame #10: 0x0000000140346d69 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
    frame #11: 0x000000014034157a CoreFoundation`__CFRunLoopDoObservers + 541
    frame #12: 0x000000014034125b CoreFoundation`CFRunLoopRunSpecific + 691
    frame #13: 0x00000001517c755c UIFoundation`-[NSHTMLReader _loadUsingWebKit] + 1847
    frame #14: 0x00000001517c84a1 UIFoundation`-[NSHTMLReader attributedString] + 22
    frame #15: 0x0000000151748d63 UIFoundation`_NSReadAttributedStringFromURLOrData + 10026
    frame #16: 0x00000001517465c4 UIFoundation`-[NSAttributedString(NSAttributedStringUIFoundationAdditions) initWithData:options:documentAttributes:error:] + 144
    frame #17: 0x000000010b1f8c22 TestWebKitAPI`CopyHTML_SanitizationPreservesCharacterSet_Test::TestBody(this=0x00007fda2dd30a60) at CopyHTML.mm:160:41
    frame #18: 0x000000010ba3c594 TestWebKitAPI`void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(object=0x00007fda2dd30a60, method=21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00, location="the test body")(), char const*) at gtest.cc:2443:10
    frame #19: 0x000000010ba1aecb TestWebKitAPI`void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(object=0x00007fda2dd30a60, method=21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00, location="the test body")(), char const*) at gtest.cc:2479:14
    frame #20: 0x000000010ba1ae06 TestWebKitAPI`testing::Test::Run(this=0x00007fda2dd30a60) at gtest.cc:2517:5
    frame #21: 0x000000010ba1bc2a TestWebKitAPI`testing::TestInfo::Run(this=0x00007fda2f30e920) at gtest.cc:2693:11
    frame #22: 0x000000010ba1ca54 TestWebKitAPI`testing::TestCase::Run(this=0x00007fda2f30e2f0) at gtest.cc:2811:28
    frame #23: 0x000000010ba27798 TestWebKitAPI`testing::internal::UnitTestImpl::RunAllTests(this=0x00007fda2dd08150) at gtest.cc:5177:43
    frame #24: 0x000000010ba40c24 TestWebKitAPI`bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(object=0x00007fda2dd08150, method=10 75 a2 0b 01 00 00 00 00 00 00 00 00 00 00 00, location="auxiliary test code (environments or event listeners)")(), char const*) at gtest.cc:2443:10
    frame #25: 0x000000010ba272ab TestWebKitAPI`bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(object=0x00007fda2dd08150, method=10 75 a2 0b 01 00 00 00 00 00 00 00 00 00 00 00, location="auxiliary test code (environments or event listeners)")(), char const*) at gtest.cc:2479:14
    frame #26: 0x000000010ba2717d TestWebKitAPI`testing::UnitTest::Run(this=0x000000010bd6e138) at gtest.cc:4786:10
    frame #27: 0x000000010b852e41 TestWebKitAPI`RUN_ALL_TESTS() at gtest.h:2341:46
    frame #28: 0x000000010b852dd2 TestWebKitAPI`TestWebKitAPI::TestsController::run(this=0x000000010bd6de98, argc=1, argv=0x00007ffee4bba2e8) at TestsController.cpp:90:13
    frame #29: 0x000000010b9ee505 TestWebKitAPI`main(argc=2, argv=0x00007ffee4bba2e8) at mainIOS.mm:49:62
    frame #30: 0x0000000141655bbd libdyld.dylib`start + 1
    frame #31: 0x0000000141655bbd libdyld.dylib`start + 1

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