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From: Ken Brown <kbrown@cornell.edu>
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: Re: emacs-X11 freezes with mouse cut and paste
Date: Wed, 27 Mar 2019 18:33:33 +0000
Message-ID: <614fbba4-3425-4705-3342-99bbe8684ee0@cornell.edu>
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On 3/27/2019 10:40 AM, Rockefeller, Harry wrote:
> CYGWIN_NT-6.1 HARRYR-PC 3.0.4(0.338/5/3) 2019-03-16 09:50 x86_64 Cygwin
> GNU Emacs 26.1
> 
> How this happened.
> It had happened twice before but appeared to be intermittent.
> This time it happened I had copied a line from an xterm, including the [return].
> Moved mouse to emacs window and using the middle mouse button attempted to paste the copied text.
> It didn't paste and now emacs is frozen; not responding to keyboard or mouse.
> 
> In xterm window I entered
> Gdb /usr/bin/emacs-X11.exe
> Gdb told me it read the symbols.
> (gdb) info source
> Current source file is /usr/src/debug/emacs-26.1-1/src/emacs.c
> Compilation directory is /usr/src/debug/emacs-26.1-1/src
> Located in /usr/src/debug/emacs-26.1-1/src/emacs.c
> Contains 2676 lines.
> Source language is c.
> Producer is GNU C11 7.3.0 -mtune=generic -march=x86-64 -ggdb -O2 -fopenmp -fstack-protector-strong --param ssp-buffer-size=4.
> Compiled with DWARF 2 debugging format.
> Does not include preprocessor macro info.
> (gdb) list
> 660           emacs_perror ("Write error to standard output");
> 661           _exit (EXIT_FAILURE);
> 662         }
> 663
> 664       /* Do not close stderr if addresses are being sanitized, as the
> 665          sanitizer might report to stderr after this function is
> 666          invoked.  */
> 667       if (!ADDRESS_SANITIZER && close_stream (stderr) != 0)
> 668         _exit (EXIT_FAILURE);
> 669     }
> 
> I am not familiar with using gdb this way.  There is no "frame", no "info local", no stack.

That's because you haven't started the program.  Use the gdb "run" command. 
Alternatively, instead of running emacs under gdb, you could just run emacs as 
you normally do and then attach gdb when emacs freezes.  ("gdb -p <PID>")  At 
that point, a backtrace of all threads would be useful.

Ken

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