[Webkit-unassigned] [Bug 121099] New: [WK2][GTK] Frequent crashes when showing context menus in Debug builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121099

           Summary: [WK2][GTK] Frequent crashes when showing context menus
                    in Debug builds
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com
                CC: xan.lopez at gmail.com, gns at gnome.org,
                    mrobinson at webkit.org, cgarcia at igalia.com


It's becoming quite common to get a crash in the UIProcess when showing context menus at least with Debug builds. After debugging it a bit it looks like the problem happens inside WebContextMenuProxyGtk::contextMenuItemVisibilityChanged, here

    GOwnPtr<GList> items(gtk_container_get_children(GTK_CONTAINER(menu)));

Basically the problem is that the menu reference is invalid. That likely means that the menu was freed and then we're trying to use it. Since this is a signal callback the problem is likely that we aren't disconnecting the signals when destroying the context menu.

Patch to follow.

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