[Webkit-unassigned] [Bug 109305] New: [WK2] Page reloading will crash UIProcess after WebProcess was killed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109305

           Summary: [WK2] Page reloading will crash UIProcess after
                    WebProcess was killed
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P1
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: savagobr at yahoo.com


Steps to reproduce:

a) Start a WK2 based browser
b) Kill the associated WebProcess
c) Reload the page

What happens:
A call to load a new page or to reload the current page will start by first inspecting the state of WebProcess. If it is not valid, WebPageProxy::reattachToWebProcess() is executed that later will call WebPageProxy::initializeWebPage().

The backtrace shows that in ::initializeWebPage the crash happens, at calling a method of the class object pointed by m_inspector (an instance of WebInspectorProxy). The issue is that when the WebProcess dies, WebPageProxy::processDidCrash() is executed and sets the pointer to null.

This patch adds a check for the pointer state before executing calls on it and moves the creation of WebInspector object from the reattachToWebProcess() to initializeWebPage().

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