Bug 280843 – REGRESSION(284553@main): [Win] ASSERTION FAILED: !didReceiveInvalidMessage in GPU process

• Status: RESOLVED
• Resolution: INVALID
• Component: WebKit2

[Fujii Hironori]

After 284553@main, Windows Debug layout tests buildbot is observing a random assertion failure in GPU process.

ASSERTION FAILED: !didReceiveInvalidMessage
C:\BW\Windows-64-bit-Debug-Build\build\Source\WebKit\Platform/IPC/Connection.cpp(1450) : void IPC::Connection::dispatchMessage(UniqueRef<Decoder>)


Buildbot: builder Windows-64-bit-Debug-Tests build 113 : 284593@main
https://build.webkit.org/#/builders/1190/builds/113
https://build.webkit.org/results/Windows-64-bit-Debug-Tests/284593@main%20(113)/fast/dom/Window/addEventListener-implicit-this-stderr.txt


Buildbot: builder Windows-64-bit-Debug-Tests build 114 : 284602@main
https://build.webkit.org/#/builders/1190/builds/114
https://build.webkit.org/results/Windows-64-bit-Debug-Tests/284602@main%20(114)/fast/dom/Window/atob-btoa-stderr.txt

[Kimmo Kinnunen]

I think this is very much a goal.

In general, we should move into direction that messages are not sent to non-existing targets.

In GPU process, I cannot see a reason why there would be correct code that would ignore a message.

The normal reason for this is that somehow GPU process makes a decision of "this object can be removed now" on its own. The likely that decision should be made by the creator, e.g the WCP.

I know it's tedious to rearchitect the code for this, but I think it produces better results.

Note: in WCP and UIP we skip messages to unknown targets, but it would be good to move away from that practice.

[Kimmo Kinnunen]

Hmm, looking at it more, it really seems like a invalid message error and not a missing destination.

Maybe if I added more logging, we could see if it's a Connection issue or Win port invalid message issue?

[Kimmo Kinnunen]

Also, as a side-note, it would be useful if Win port could run the TestIPC unit tests.  If it already does, great!

[Fujii Hironori]

TestIPC is not available for Windows port yet.

This assertion failure is reproducible on my PC.

> python .\Tools\Scripts\run-webkit-tests --debug --no-retry --iter=1000 -f fast/dom/Window/a-rel-noopener.html 

Using a debugger, message.m_ref._Mypair._Myval2->m_messageName was GPUConnectionToWebProcess_CreateRenderingBackend (34).

[Fujii Hironori]

It was an invalid message because decoding Win32Handle has failed.
See also 279361@main (bug#258440).

[Radar WebKit Bug Importer]

<rdar://problem/137702244>

[Kimmo Kinnunen]

Closing as invalid. Please reopen if theres's work to do.