239496 2022-04-19 07:29:45 -0700 [GPUProcess][Unix] RemoteRenderingBackendProxy::DidCreateWakeUpSemaphoreForDisplayListStream is never sent 2022-04-20 12:03:48 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 239399 P2 Normal --- 238593 1 zan zan kkinnunen oldest_to_newest 1862541 0 zan 2022-04-19 07:29:45 -0700 Currently, the RemoteRenderingBackendProxy::DidCreateWakeUpSemaphoreForDisplayListStream() message is dispatched in the RemoteRenderingBackend constructor before the underlying connection is open. The connection exists, it's valid, just not open, so the message isn't sent but it's still kept in the outgoing messages queue. There's no other message dispatched on this connection afterwards, meaning the queue doesn't get flushed. So the initial message is never sent, which then causes problems down the line in GPUProcess execution. It's possible to rework things so that the message is sent after the connection is opened, but there's also the question of whether the Unix implementation of IPC::Connection should handle this situation somewhat better. 1862542 1 457890 zan 2022-04-19 07:33:30 -0700 Created attachment 457890 The workaround 1862550 2 457892 zan 2022-04-19 08:14:36 -0700 Created attachment 457892 Patch 1862551 3 zan 2022-04-19 08:15:44 -0700 (In reply to Zan Dobersek from comment #2) > Created attachment 457892 [details] > Patch Turned it into a proper patch. It also includes the RemoteRenderingBackend::startListeningForIPC() method being folded into the constructor. 1863014 4 457892 kkinnunen 2022-04-20 12:03:39 -0700 Comment on attachment 457892 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=457892&action=review > Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.cpp:107 > m_streamConnection->open(); This line starts invoking the virtual functions from the other thread. The vptr of the object is set up by the constructor and is not thread-safe, so this cannot happen in the constructor. The bug was fixed in bug 239399 1863015 5 kkinnunen 2022-04-20 12:03:48 -0700 *** This bug has been marked as a duplicate of bug 239399 *** 457890 2022-04-19 07:33:30 -0700 2022-04-19 08:14:32 -0700 The workaround bug-239496-20220419163329.patch text/plain 3669 zan U3VidmVyc2lvbiBSZXZpc2lvbjogMjkzMDE1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IGFiYmVkYmFhNTY4ZTU5NjAz MzUwMjYyNWI2NWFhYzM4ODBlNDFkYmIuLjYwMTFmYTNkNWY5YWFlMWQ3NTczMjVlOGI4M2YyNmVi MmU3MGEzYTcgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTggQEAKKzIwMjItMDQtMTkgIFphbiBEb2Jl cnNlayAgPHpkb2JlcnNla0BpZ2FsaWEuY29tPgorCisgICAgICAgIFtHUFVQcm9jZXNzXVtVbml4 XSBSZW1vdGVSZW5kZXJpbmdCYWNrZW5kUHJveHk6OkRpZENyZWF0ZVdha2VVcFNlbWFwaG9yZUZv ckRpc3BsYXlMaXN0U3RyZWFtIG5ldmVyIGFycml2ZXMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIzOTQ5NgorCisgICAgICAgIFJldmlld2VkIGJ5IE5P 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