Bug 154784 – SHOULD NEVER BE REACHED at DerivedSources/WebKit2/WebProcessMessageReceiver.cpp(265) : void WebKit::WebProcess::didReceiveSyncWebProcessMessage

• Component: WebKit2
• Status: NEW

[Michael Catanzaro]

I can reliably crash Epiphany with a debug build of WebKit by pressing Ctrl+T (open new tab) then Ctrl+Q (quit) in quick succession. I suspect it's a cross-platform bug as it's hitting this assert:

SHOULD NEVER BE REACHED
DerivedSources/WebKit2/WebProcessMessageReceiver.cpp(265) : void WebKit::WebProcess::didReceiveSyncWebProcessMessage(IPC::Connection &, IPC::MessageDecoder &, std::unique_ptr<IPC::MessageEncoder> &)

I'll reproduce that function in full:

void WebProcess::didReceiveSyncWebProcessMessage(IPC::Connection& connection, IPC::MessageDecoder& decoder, std::unique_ptr<IPC::MessageEncoder>& replyEncoder)
{
    if (decoder.messageName() == Messages::WebProcess::ProcessWillSuspendImminently::name()) {
        IPC::handleMessage<Messages::WebProcess::ProcessWillSuspendImminently>(decoder, *replyEncoder, this, &WebProcess::processWillSuspendImminently);
        return;
    }
    UNUSED_PARAM(connection);
    UNUSED_PARAM(decoder);
    UNUSED_PARAM(replyEncoder);
    ASSERT_NOT_REACHED();
}

My guess is that Messages::WebProcess::ProcessWillSuspendImminently is being sent by WebProcessProxy before the WebProcess object has been constructed and registered its message handlers in the web process.

[Michael Catanzaro]

(In reply to comment #0)
> My guess is that Messages::WebProcess::ProcessWillSuspendImminently is being
> sent by WebProcessProxy before the WebProcess object has been constructed
> and registered its message handlers in the web process.

It's not a very good guess, as the crash is in WebProcess::didReceiveSyncWebProcessMessage.