229106 2021-08-14 01:41:37 -0700 [GPU Process] REGRESSION: WebContent often crashes when opening a Google spreadsheet with charts 2021-08-14 16:23:07 -0700 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 sabouhallawa sabouhallawa dino simon.fraser thorton webkit-bug-importer wenson_hsieh oldest_to_newest 1784316 0 sabouhallawa 2021-08-14 01:41:37 -0700 The crash may happen when creating many ImageBuffers consecutively. So WebProcess sends many RemoteRenderingBackend::CreateImageBuffer messages to WebProcess. While the GPUProcess is busy creating the backends and sending the messages RemoteRenderingBackendProxy::DidCreateImageBufferBackend back to WebProcess, the WebProcess is busy drawing to the new ImageBuffers by appending DisplayList items to their DrawingContexts. RemoteRenderingBackendProxy::didAppendData() is called back with every DisplayList item appended to any ImageBuffer DisplayList. The problem happens when appending DisplayList item to a backend-less RemoteImageBufferProxy. Here is an example which may cause this crash: WebProcess: 1. RemoteRenderingBackend::CreateImageBuffer is sent for RemoteImageBufferProxy 'A'. 2. RemoteRenderingBackend::DidCreateImageBufferBackend is received for RemoteImageBufferProxy 'A'. 3. DisplayList items are appended to the context of a RemoteImageBufferProxy 'A'. 4. RemoteRenderingBackend::CreateImageBuffer is sent for RemoteImageBufferProxy 'B'. 5. DisplayList items are appended to the context of a backend-less RemoteImageBufferProxy 'B'. 6. RemoteRenderingBackendProxy::didAppendData() sends RemoteRenderingBackend::WakeUpAndApplyDisplayList message = { 'A', GPUProcessWakeupReason::ItemCountHysteresisExceeded, ... } 7. RemoteRenderingBackend::CreateImageBuffer is sent for RemoteImageBufferProxy 'C'. 8. DisplayList items are appended to the context of a backend-less RemoteImageBufferProxy 'C'. 9. m_parameters.resumeDisplayListSemaphore is signaled with resumeReadingInfo { 'C', ... } GPUProcess: 1. RemoteRenderingBackend::nextDestinationImageBufferAfterApplyingDisplayLists() replays the DisplayList items to the backend of 'A' 2. RemoteRenderingBackend::nextDestinationImageBufferAfterApplyingDisplayLists() sets m_pendingWakeupInfo to { 'B', GPUProcessWakeupReason::ItemCountHysteresisExceeded } 3. RemoteRenderingBackend::createImageBuffer() is called to create the RemoteImageBuffer 'B'. 4. RemoteRenderingBackend::createImageBuffer() voluntarily calls wakeUpAndApplyDisplayList() because m_pendingWakeupInfo matches 'B' 5. RemoteRenderingBackend::nextDestinationImageBufferAfterApplyingDisplayLists() replays the DisplayList items to the backend of 'B' 6. Trying to find the next ImageBuffer, nextDestinationImageBufferAfterApplyingDisplayLists sees the reason = GPUProcessWakeupReason::ItemCountHysteresisExceeded so it looks at the resumeReadingInfo 7. It finds the resumeReadingInfo->destination = 'C' but it does not find in its cache because it has not been created yet. Here is the call stack: Requesting termination of web process 23 for reason: "Missing image buffer destination when resuming display list processing" Thread 2 Crashed:: WebKit::RemoteRenderingBackend::nextDestinationImageBufferAfterApplyingDisplayLists(WebCore::ImageBuffer&, unsigned long, WebKit::DisplayListReaderHandle&, WebKit::GPUProcessWakeupReason) + 2364 WebKit::RemoteRenderingBackend::wakeUpAndApplyDisplayList(WebKit::GPUProcessWakeupMessageArguments const&) + 180 WebKit::RemoteRenderingBackend::createImageBuffer(WebCore::FloatSize const&, WebCore::RenderingMode, float, WebCore::DestinationColorSpace const&, WebCore::PixelFormat, WTF::ObjectIdentifier<WebCore::RenderingResourceIdentifierType>) + 1352 WebKit::RemoteRenderingBackend::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 2044 WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(void*) + 60 1784317 1 sabouhallawa 2021-08-14 01:42:08 -0700 <rdar://81806877> 1784319 2 435535 sabouhallawa 2021-08-14 01:57:49 -0700 Created attachment 435535 Patch 1784322 3 435536 sabouhallawa 2021-08-14 04:00:08 -0700 Created attachment 435536 Patch 1784326 4 435538 sabouhallawa 2021-08-14 05:28:27 -0700 Created attachment 435538 Patch 1784352 5 435549 sabouhallawa 2021-08-14 13:39:47 -0700 Created attachment 435549 Safer but less reliable fix 1784356 6 ews-feeder 2021-08-14 16:23:05 -0700 Committed r281058 (240521@main): <https://commits.webkit.org/240521@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 435538. 435535 2021-08-14 01:57:49 -0700 2021-08-14 04:05:36 -0700 Patch bug-229106-20210814015748.patch text/plain 1878 sabouhallawa U3VidmVyc2lvbiBSZXZpc2lvbjogMjgwOTg2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IGI3ZTNhYjcxNGFiN2YxMzFm YTk3Y2VmYmY4MGRmZDQyNDRhZDJiOGIuLmI3OTY4ZDEzODA0N2M3MzljZGJmMGU1ZWM3MmIzZDIy N2Y2NDMxNGMgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTUgQEAKKzIwMjEtMDgtMTQgIFNhaWQgQWJv dS1IYWxsYXdhICA8c2FpZEBhcHBsZS5jb20+CisKKyAgICAgICAgW0dQVSBQcm9jZXNzXSBSRUdS RVNTSU9OOiBXZWJDb250ZW50IG9mdGVuIGNyYXNoZXMgd2hlbiBvcGVuaW5nIGEgR29vZ2xlIHNw cmVhZHNoZWV0IHdpdGggY2hhcnRzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3No b3dfYnVnLmNnaT9pZD0yMjkxMDYKKyAgICAgICAgPHJkYXI6Ly84MTgwNjg3Nz4KKworICAgICAg ICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBQb3N0cG9uZSBzZW5kaW5n 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