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23.1.50; gdb mode screwup when setting breakpoint

From: Miles Bader
Subject: 23.1.50; gdb mode screwup when setting breakpoint
Date: Thu, 20 Aug 2009 20:31:27 +0900

[I sent this yesterday also, but I'm forwarding this to emacs-devel,
since I dunno where emacs-pretest-bug ends up or if anybody reads it]

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

   (1) start emacs, with -Q

   (2) start gdb on an executable in the current dir; let's say it's
       called "foo", and is the most recent excutable in that dir, so
       gdb chooses it by default:

         M-x gdb RET

   (3) split the current window:

         C-x 2

   (3) Visit the source file containing the "main" function, and move to
       some source line in that function:

         C-x C-f foo.c RET
         C-n ...

   (4) Set a breakpoint on that line:

         C-x SPC

   (5) **** Note that the "(gdb) " prompt in the *gud-foo* buffer has
       disappeared!  Weird... but let's continue

   (6) Select the other window, where the *gud-foo* buffer is:

         C-x o

   (7) Try to run the program, even though the prompt is gone:

         run RET

   (8) **** The following error messages are given (these lines are from
       the *Messages* buffer):

         error in process filter: gdb-starting: Unexpected `starting' annotation
         error in process filter: Unexpected `starting' annotation

       Also note that for some reason, the "run" command caused a
       breakpoint list to be displayed in the *gud-foo* buffer, and that
       now there's a prompt again!

   (9) Try to run again, using "run RET"; this time it works (after you
       answer "y" to the gdb query), and correctly stops at the
       breakpoint you set.



If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/23.1.50/etc/DEBUG for instructions.

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 2.16.5)
 of 2009-08-19 on dhlpc061
Windowing system distributor `The X.Org Foundation', version 11.0.10603000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ja_JP.UTF-8
  value of $XMODIFIERS: @im=SCIM
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Diff

Minor modes in effect:
  diff-auto-refine-mode: t
  show-paren-mode: t
  recentf-mode: t
  rcirc-track-minor-mode: t
  minibuffer-electric-default-mode: t
  display-time-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-j <escape> g C-p C-k C-n C-p C-p C-e C-p C-b C-e 
C-b C-b C-j C-j <escape> g C-p C-k <down-mouse-1> <mouse-1> 
C-p C-p C-p C-p C-p C-p C-p C-p C-n M-b M-b M-b M-b 
M-b M-b M-b <escape> f <backspace> SPC v e r y <escape> 
d <escape> d SPC n i c e C-n C-a C-d a C-n C-e C-b 
C-b C-b C-b C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-u C-p C-u C-p C-u C-p C-u C-p C-p C-e 
M-h s o m e <escape> g C-a C-n C-c C-c <return> q K 
g p p = SPC q n p p p p p p p p p p p p p p p p p n 
n n p p p p p p p p p p p p p p p p p p p p p p p p 
p p p p p p p p <escape> x r c SPC <return> <switch-frame> 
<switch-frame> <switch-frame> <switch-frame> <switch-frame> 
<switch-frame> C-c C-SPC C-c C-q q SPC <return> h i 
SPC : ( ) <backspace> <backspace> ) <return> C-c C-SPC 
C-c C-SPC <down-mouse-1> <mouse-movement> <mouse-1> 
C-c C-SPC C-x d C-x d C-x d C-c C-SPC n n n n n C-v 
C-v g <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> C-c C-SPC h e y a <return> w h a t 
SPC d o i n ? <return> C-c C-SPC C-c C-SPC C-u C-u 
C-p C-u C-p C-n = SPC n q n n n n n n n n n n n n n 
n n n n n n <switch-frame> <escape> x g d b C-g <switch-frame> 
<switch-frame> <switch-frame> <switch-frame> <down-mouse-1> 
<mouse-movement> <mouse-1> <escape> x r e p o r t SPC 

Recent messages:
Reading active file via nnml...done
Checking new news...done
Retrieving newsgroup: nntp+news.gmane.org:gmane.emacs.devel...
Fetching headers for nntp+news.gmane.org:gmane.emacs.devel...done
Suppressing duplicates...done
Sorting articles...done
Generating summary...done
Waiting for async article...

Load-path shadows:
/home/soft1/miles/.emacs.d/elpa/lua-mode-20070608/lua-mode hides 
/usr/share/emacs22/site-lisp/dictionaries-common/ispell hides 
/usr/share/emacs22/site-lisp/dictionaries-common/flyspell hides 
~/src/elisp/timer hides /usr/local/share/emacs/23.1.50/lisp/emacs-lisp/timer

The car has become... an article of dress without which we feel uncertain,
unclad, and incomplete.  [Marshall McLuhan, Understanding Media, 1964]

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