[WinCairo] ASSERTION FAILED: m_webPage.bounds().contains(bounds) in WebKit::DrawingAreaWC::sendUpdateNonAC Sometimes I'm observing the following assertion failure while using WinCairo MiniBrowser (Debug build). ASSERTION FAILED: m_webPage.bounds().contains(bounds) C:\home\webkit\gc\Source\WebKit\WebProcess\WebPage\wc\DrawingAreaWC.cpp(300) : WebKit::DrawingAreaWC::sendUpdateNonAC 1 00007FFBAFFC249B WTFCrash 2 00007FFB49BEA03E WTFCrashWithInfo 3 00007FFB49CED0A2 WebKit::DrawingAreaWC::sendUpdateNonAC 4 00007FFB49CECC4F WebKit::DrawingAreaWC::updateRendering 5 00007FFB49CF255A std::invoke<void (__cdecl WebKit::DrawingAreaWC::*&)(void),WebKit::DrawingAreaWC * &> 6 00007FFB49CF08EE std::_Invoker_ret<std::_Unforced>::_Call<void (__cdecl WebKit::DrawingAreaWC::*&)(void),WebKit::DrawingAreaWC * &> 7 00007FFB49CF0951 std::_Call_binder<std::_Unforced,0,void (__cdecl WebKit::DrawingAreaWC::*)(void),std::tuple<WebKit::DrawingAreaWC *>,std::tuple<> > 8 00007FFB49CF08AB std::_Binder<std::_Unforced,void (__cdecl WebKit::DrawingAreaWC::*&)(void),WebKit::DrawingAreaWC *>::operator()<> 9 00007FFB49CF560B WTF::Detail::CallableWrapper<std::_Binder<std::_Unforced,void (__cdecl WebKit::DrawingAreaWC::*&)(void),WebKit::DrawingAreaWC *>,void>::call 10 00007FFB49C75594 WTF::Function<void __cdecl(void)>::operator() 11 00007FFB49CEB04B WebCore::Timer::fired 12 00007FFB4F1FC178 WebCore::ThreadTimers::sharedTimerFiredInternal 13 00007FFB4F2004DF `WebCore::ThreadTimers::setSharedTimer'::`8'::<lambda_1>::operator() 14 00007FFB4F20191B WTF::Detail::CallableWrapper<`WebCore::ThreadTimers::setSharedTimer'::`8'::<lambda_1>,void>::call 15 00007FFB49C75594 WTF::Function<void __cdecl(void)>::operator() 16 00007FFB4F1B2CE7 WebCore::MainThreadSharedTimer::fired 17 00007FFB4BC165EA WebCore::TimerWindowWndProc 18 00007FFC219BE858 CallWindowProcW 19 00007FFC219BE299 DispatchMessageW 20 00007FFBB014BE86 WTF::RunLoop::run 21 00007FFB49D0A26B WebKit::AuxiliaryProcessMainBase<WebKit::WebProcess,1>::run 22 00007FFB49D0A033 WebKit::AuxiliaryProcessMain<WebKit::WebProcessMainWin> 23 00007FFB49D09E75 WebKit::WebProcessMain 24 00007FF75413101D main 25 00007FF75413125C __scrt_common_main_seh 26 00007FFC20957034 BaseThreadInitThunk 27 00007FFC21BE2651 RtlUserThreadStart Exception thrown at 0x00007FFBAFFC24A0 (WTF.dll) in WebKitWebProcess.exe: 0xC0000005: Access violation writing location 0x00000000BBADBEEF.
Created attachment 460885 [details] Patch
It's easy to reproduce the assertion failure with the following steps. 1. Start WinCairo MiniBrowser (Debug build) 2. Open Web Inspector 3. Open Layers tab 4. Close Web Inspector 5. Mouse right click → Inspect Element
Created attachment 460906 [details] Patch
commit-queue failed to commit attachment 460906 [details] to WebKit repository. To retry, please set cq+ flag again.
Committed 252616@main (24aaf4a92f6e): <https://commits.webkit.org/252616@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 460906 [details].
<rdar://problem/97282535>