[Webkit-unassigned] [Bug 146347] New: [GTK] Crash in WebKit::supportsXDamageAndXComposite

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146347

            Bug ID: 146347
           Summary: [GTK] Crash in WebKit::supportsXDamageAndXComposite
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com

Created attachment 255638
  --> https://bugs.webkit.org/attachment.cgi?id=255638&action=review
full backtrace

I'm not really sure what to make of this crash report, whether it's a WebKit issue or an X11 issue:

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 XQueryExtension at QuExt.c:43
 #1 XInitExtension at InitExt.c:47
 #2 XDamageExtAddDisplay at Xdamage.c:58
 #3 XDamageFindDisplay at Xdamage.c:202
 #4 XDamageQueryExtension at Xdamage.c:288
 #5 WebKit::supportsXDamageAndXComposite at /usr/src/debug/webkitgtk-2.9.3/Source/WebKit2/UIProcess/gtk/RedirectedXCompositeWindow.cpp:115
 #6 WebKit::RedirectedXCompositeWindow::create(_GdkWindow*, std::function<void ()>) at /usr/src/debug/webkitgtk-2.9.3/Source/WebKit2/UIProcess/gtk/RedirectedXCompositeWindow.cpp:135
 #7 webkitWebViewBaseRealize at /usr/src/debug/webkitgtk-2.9.3/Source/WebKit2/UIProcess/API/gtk/WebKitWebViewBase.cpp:332
 #12 gtk_widget_realize at gtkwidget.c:5551
 #13 gtk_widget_map at gtkwidget.c:5066

QuExt.c is pretty simple [1]; looks like we may have passed an invalid display (dpy=dpy at entry=0x55c3119500b0).

[1] http://cgit.freedesktop.org/xorg/lib/libX11/tree/src/QuExt.c

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