Bug 285718 – [Win Skia] ASSERTION FAILED: bitmap->size() == updateSize : BackingStore::incorporateUpdate(UpdateInfo &&) on the fractional device pixel ratio display

• Component: New Bugs
• Status: RESOLVED FIXED

[Fujii Hironori]

[Win Skia] ASSERTION FAILED: bitmap->size() == updateSize : BackingStore::incorporateUpdate(UpdateInfo &&) on the fractional device pixel ratio display

1. Start Windows Skia MiniBrowser in 150% DPI display
2. Load https://webkit.org
3. Open Inspector
4. An assertion fails

ASSERTION FAILED: bitmap->size() == updateSize
C:\webkit\wc\Source\WebKit\UIProcess\skia\BackingStoreSkia.cpp(83) : void WebKit::BackingStore::incorporateUpdate(UpdateInfo &&)
1   00007FFDA8A2C496 WebKit::BackingStore::incorporateUpdate
2   00007FFDA89F5DA5 WebKit::DrawingAreaProxyWC::incorporateUpdate
3   00007FFDA89F5B76 WebKit::DrawingAreaProxyWC::update
4   00007FFDA8DAD5DD IPC::callMemberFunction<WebKit::DrawingAreaProxy,WebKit::DrawingAreaProxy,void (unsigned long long, WebKit::UpdateInfo &&),std::tuple<unsigned long long,WebKit::UpdateInfo> >::<lambda_1>::operator()<unsigned long long,WebKit::UpdateInfo>
5   00007FFDA8DAD567 std::invoke<`lambda at C:\webkit\wc\Source\WebKit\Platform\IPC\HandleMessage.h:132:9',unsigned long long,WebKit::UpdateInfo>
6   00007FFDA8DAD52E std::_Apply_impl<`lambda at C:\webkit\wc\Source\WebKit\Platform\IPC\HandleMessage.h:132:9',std::tuple<unsigned long long,WebKit::UpdateInfo>,0,1>
7   00007FFDA8DAD4E2 std::apply<`lambda at C:\webkit\wc\Source\WebKit\Platform\IPC\HandleMessage.h:132:9',std::tuple<unsigned long long,WebKit::UpdateInfo> >
8   00007FFDA8DACC4F IPC::callMemberFunction<WebKit::DrawingAreaProxy,WebKit::DrawingAreaProxy,void (unsigned long long, WebKit::UpdateInfo &&),std::tuple<unsigned long long,WebKit::UpdateInfo> >
9   00007FFDA8DA9D10 IPC::handleMessage<Messages::DrawingAreaProxy::Update,IPC::Connection,WebKit::DrawingAreaProxy,WebKit::DrawingAreaProxy,void (unsigned long long, WebKit::UpdateInfo &&)>
10  00007FFDA8DA90E6 WebKit::DrawingAreaProxy::didReceiveMessage
11  00007FFDA9B5F03D IPC::MessageReceiverMap::dispatchMessage
12  00007FFDA9BF643B WebKit::AuxiliaryProcessProxy::dispatchMessage
13  00007FFDA9EB40CB WebKit::WebProcessProxy::dispatchMessage
14  00007FFDA8E7DC7B WebKit::WebProcessProxy::didReceiveMessage
15  00007FFDA9B2EB59 IPC::Connection::dispatchMessage
16  00007FFDA9B2EDC3 IPC::Connection::dispatchMessage
17  00007FFDA9B2F474 IPC::Connection::dispatchIncomingMessages
18  00007FFDA9B3440B IPC::Connection::enqueueIncomingMessage::<lambda_6>::operator()
19  00007FFDA9B343A7 WTF::Detail::CallableWrapper<`lambda at C:\webkit\wc\Source\WebKit\Platform\IPC\Connection.cpp:1339:31',void>::call
20  00007FFD839422FC WTF::Function<void ()>::operator()
21  00007FFD853931C2 WTF::RunLoop::performWork
22  00007FFD8552F0B8 WTF::RunLoop::wndProc
23  00007FFD8552EFC3 WTF::RunLoop::RunLoopWndProc
24  00007FFE91D083F1 DispatchMessageW
25  00007FFE91D07EB1 DispatchMessageW
26  00007FF72F0D9BA8 wWinMain
27  00007FF72F0DB1EA __scrt_common_main_seh
28  00007FFE910F259D BaseThreadInitThunk
29  00007FFE922CAF38 RtlUserThreadStart
Exception thrown at 0x00007FFD85307AB5 (JavaScriptCore.dll) in MiniBrowser.exe: 0xC0000005: Access violation writing location 0x00000000BBADBEEF.

[Fujii Hironori]

Pull request: https://github.com/WebKit/WebKit/pull/38823

[EWS]

Committed 288818@main (0aed73553051): <https://commits.webkit.org/288818@main>

Reviewed commits have been landed. Closing PR #38823 and removing active labels.