Subject: bug#22932: 25.0.92; X protocol error: BadRequest (invalid request code or no such operation) on protocol request 149

From: Eli Zaretskii <[email-masked]>
Date: Mon, 07 Mar 2016 18:21:43 +0200

> From: John Eismeier <[email-masked]>
> Date: Mon, 07 Mar 2016 08:41:23 -0500
> 
> 
> I am using Ubuntu 14.04 with regular builds of the pretest.  Moving the
> window has commonly crashed emacs.  How do I provide further details of
> this concern?

The file etc/DEBUG provides advice for this case (search for "X
protocol errors").  Do what it says to put Emacs into the synchronous
X mode, after starting Emacs under GDB and setting a breakpoint at
x_error_quitter.  Then show the backtrace you obtain.

Thanks.