[Webkit-unassigned] [Bug 164303] New: [GTK] BadDamage X Window System error in WebKit::AcceleratedBackingStoreX11::update when called from WebPageProxy::exitAcceleratedCompositingMode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164303

            Bug ID: 164303
           Summary: [GTK] BadDamage X Window System error in
                    WebKit::AcceleratedBackingStoreX11::update when called
                    from WebPageProxy::exitAcceleratedCompositingMode
    Classification: Unclassified
           Product: WebKit
           Version: Other
          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
                CC: bugs-noreply at webkitgtk.org

Created attachment 293621
  --> https://bugs.webkit.org/attachment.cgi?id=293621&action=review
Backtrace with breakpoint set on gdk_x_error()

With Epiphany master, if you close the browser with Ctrl+C, about half the time you will receive this:

(epiphany:28727): Gdk-ERROR **: The program 'epiphany' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDamage (invalid Damage parameter)'.
  (Details: serial 83341 error_code 149 request_code 142 (DAMAGE) minor_code 2)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

I think you can reproduce it with a stable version of Epiphany by using Ctrl+Q or the Quit app menu item.

Detailed backtrace attached.

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