[Webkit-unassigned] [Bug 161444] New: [GTK] Plugin process crash in WebKit::NetscapePluginX11::visibilityDidChange

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161444

            Bug ID: 161444
           Summary: [GTK] Plugin process crash in
                    WebKit::NetscapePluginX11::visibilityDidChange
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Plug-ins
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com
                CC: bugs-noreply at webkitgtk.org

Here's an evince browser plugin crash in WebKit::NetscapePluginX11::visibilityDidChange. After closing an Epiphany tab, WebKit calls gdk_x11_window_get_xid with a NULL GdkWindow:

Thread 1 (Thread 0x7f3255dc6ac0 (LWP 3682)):
#0  0x00007f324b294772 in _gdk_window_has_impl (window=<optimized out>) at gdkwindow.c:626
#1  0x00007f324b294772 in _gdk_window_has_impl (window=window at entry=0x0) at gdkwindow.c:627
#2  0x00007f324b2c798e in gdk_x11_window_get_xid (window=0x0) at gdkwindow-x11.c:5542
#3  0x00007f3253f1343a in WebKit::NetscapePluginX11::visibilityDidChange() (this=0x56156e41ec20) at /usr/src/debug/webkitgtk-2.12.4/Source/WebKit2/WebProcess/Plugins/Netscape/x11/NetscapePluginX11.cpp:267
        windowID = 0
#4  0x00007f3253cad366 in WebKit::PluginControllerProxy::visibilityDidChange(bool) (this=0x56156e42b230, isVisible=<optimized out>) at /usr/src/debug/webkitgtk-2.12.4/Source/WebKit2/PluginProcess/PluginControllerProxy.cpp:437

There's only one report of this ever happening (and it's mine). Full backtrace downstream.

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