GNU bug report logs - #17162
24.3; GDB interface stops working in some circumstances

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Zach Kost-Smith <zachkostsmith <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; GDB interface stops working in some circumstances
Date: Tue, 1 Apr 2014 08:45:40 -0600

[Message part 1 (text/plain, inline)]

This might be a repeat report, but something funky happened when I
submitted via Emacs and I haven't seen it come up in the archives yet, so I
figured better safe than sorry.  Here is the original message that Emacs
should have sent:

"""

Sorry, but this will require a C program to debug.

$ cat > test.c << END
int main()
{
   int i = 0;
   while (1)
   {
      sleep(1);
      i++;
   }
   return i;
}
END

$ gcc -g -o test test.c

$ emacs -Q test.c

Then in Emacs:
M-x gdb

And when asked for a command use:
gdb -i=mi --args ./test

In the *gud-test* buffer, issue the "run" command.  Wait for a while and
then use C-c C-c to interrupt the execution.  Use "next" a few times to
get to line 7 of the source (the "i++;" line).

At this point you can continue to issue commands from the *gud-test*
buffer and they work fine, but if you use commands like M-x gud-print,
M-x gud-break, etc. from the source buffers fail to do anything.  They
fail to even issue an error.  The command seems to complete and seems to
think that it has been sucessful, but no values are printed and no
breakpoints are set.

Since this is an interraction between GDB and Emacs:

$ gdb --version
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.

This is a version I built from source as an attempt at trouble shooting
this back in October of last year (this bug has been biting us for, I
don't know, 4 years?, we just stopped using GDB in Emacs long ago but I
haven't given up hope).  I reverted back to version 7.4 which is the
version in my current distro's apt repo and tried against that: the
behavior is the same.  The version of GDB in the repo:

$ gdb --version
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>.

As an aside, when troubleshooting this there seems to be more severe but
harder to reproduce issues where C-c C-c doesn't actually interrupt the
execution.  This is pretty difficult to reproduce, but it appears to
happen regularly enough that it is a concern.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
 of 2014-02-22 on king, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:    Ubuntu 12.04.4 LTS
GDB version: 7.6 or 7.4

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Wformat-security
 -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions
 -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: C/l

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  my-keys-minor-mode: t
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  desktop-save-mode: t
  winner-mode: t
  savehist-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  abbrev-mode: t

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<right> <down> <down> M-x r e p o r t - e m <tab>
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Recent messages:
Switched to thread 1
Reverting buffer `spheres.thermo'.
Desktop saved in ~/
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Command: break vmmc_translate_step.c:270
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/home/smithzv/.emacs.d/elpa/org-plus-contrib-20140331/ob-octave hides
/usr/share/emacs/24.3/lisp/org/ob-octave
/home/smithzv/.emacs.d/elpa/fringe-helper-20130519.1641/.dir-locals hides
/usr/share/emacs/24.3/lisp/gnus/.dir-locals
/home/smithzv/.emacs.d/elpa/emms-20140328.2129/tq hides
/usr/share/emacs/24.3/lisp/emacs-lisp/tq

Features:
(shadow sort mail-extr emacsbug message rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mail-utils dabbrev gdb-mi bindat
json gud misearch multi-isearch mule-util edebug impatient-mode htmlize
simple-httpd url-util url-parse url-vars html-mode-expansions sgml-mode
octave-expansions octave-mod sh-script smie executable elisp-slime-nav
etags org-element org-rmail org-mhe org-irc org-info org-gnus
org-docview doc-view jka-compr image-mode org-bibtex org-bbdb org-w3m
the-org-mode-expansions org org-macro org-footnote org-pcomplete
org-list org-faces org-entities org-version ob-emacs-lisp ob ob-tangle
org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval
org-compat org-macs org-loaddefs cal-menu calendar cal-loaddefs latexenc
eldoc bibtex dired-filter dired-hacks-utils dired-aux dired-x make-mode
conf-mode projectile pkg-info find-func lisp-mnt epl dash s preview
prv-emacs tex-buf noutline outline font-latex latex-mode-expansions
latex tex-style tex dbus vc-git flyspell ispell cc-langs
cc-mode-expansions cc-mode cc-fonts cc-guess cc-menus cc-styles cc-align
sanityinc-tomorrow-bright-theme color-theme-sanityinc-tomorrow subword
slime-xref-browser slime-compiler-notes-tree slime-sbcl-exts
slime-indentation slime-clipboard slime-tramp warnings slime-fancy
slime-fontifying-fu slime-package-fu slime-references slime-scratch
slime-presentations slime-fuzzy slime-fancy-trace slime-fancy-inspector
slime-c-p-c slime-editing-commands slime-autodoc slime-parse slime-repl
slime pp hyperspec slime-autoloads python-mode-expansions python-mode
imenu flymake rx cc-cmds cc-engine cc-vars cc-defs magit-key-mode magit
view tramp tramp-compat auth-source eieio byte-opt bytecomp byte-compile
cconv gnus-util mm-util mail-prsvr password-cache tramp-loaddefs shell
pcomplete help-mode grep compile format-spec epa derived epg epg-config
diff-mode autorevert git-rebase-mode git-commit-mode server log-edit
easy-mmode pcvs-util add-log multiple-cursors mc-separate-operations
rectangular-region-mode mc-mark-pop mc-mark-more mc-cycle-cursors
mc-edit-lines multiple-cursors-core rect expand-region
text-mode-expansions er-basic-expansions expand-region-core
expand-region-custom paredit paren android cl-macs android-mode xml
browse-url hippie-exp comint ansi-color xt-mouse mouse-sel thingatpt
recentf tree-widget wid-edit dired desktop uniquify advice help-fns
advice-preload cl cl-lib buffer-move windmove gv android-mode-autoloads
auctex-autoloads tex-site browse-kill-ring-autoloads
buffer-move-autoloads color-theme-sanityinc-tomorrow-autoloads
dired-filter-autoloads dired-open-autoloads dired-hacks-utils-autoloads
eimp-autoloads elisp-slime-nav-autoloads emms-autoloads emstar-autoloads
es-lib-autoloads expand-region-autoloads git-gutter-fringe-autoloads
fringe-helper-autoloads git-gutter-autoloads gnuplot-autoloads
google-this-autoloads helm-spotify-autoloads helm-autoloads
hexrgb-autoloads impatient-mode-autoloads htmlize-autoloads
load-relative-autoloads loc-changes-autoloads magit-autoloads
git-rebase-mode-autoloads git-commit-mode-autoloads minimap-autoloads
mo-git-blame-autoloads multi-autoloads multiple-cursors-autoloads
org-plus-contrib-autoloads paredit-autoloads pp-c-l-autoloads
projectile-autoloads pkg-info-autoloads epl-autoloads dash-autoloads
pymacs-autoloads python-mode-autoloads rainbow-mode-autoloads
s-autoloads skewer-mode-autoloads js2-mode-autoloads
simple-httpd-autoloads finder-inf slime-volleyball-autoloads
smartscan-autoloads sublimity-autoloads synonyms-autoloads
test-simple-autoloads tree-mode-autoloads unfill-autoloads w3m-autoloads
info easymenu web-autoloads windata-autoloads xml-gen-autoloads package
edmacro kmacro winner ring savehist time-date cus-start cus-load tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
register page menu-bar rfn-eshadow timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

"""

[Message part 2 (text/html, inline)]

Message #8 received at 17162 <at> debbugs.gnu.org (full text, mbox):

From: Barry OReilly <gundaetiapo <at> gmail.com>
To: zachkostsmith <at> gmail.com, 17162 <at> debbugs.gnu.org
Subject: bug#17162: 24.3; GDB interface stops working in some circumstances
Date: Tue, 1 Apr 2014 15:39:10 -0400

[Message part 1 (text/plain, inline)]

> we just stopped using GDB in Emacs long ago but I haven't given up
> hope

Does

  M-x gud-gdb

work better for you? The interface to GDB accessed via gdb command is
dreadful.

> As an aside, when troubleshooting this there seems to be more severe
> but harder to reproduce issues where C-c C-c doesn't actually
> interrupt the execution.

Possibly related: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16745

[Message part 2 (text/html, inline)]

Message #11 received at 17162 <at> debbugs.gnu.org (full text, mbox):

From: Zach Kost-Smith <zachkostsmith <at> gmail.com>
To: Barry OReilly <gundaetiapo <at> gmail.com>
Cc: 17162 <at> debbugs.gnu.org
Subject: Re: bug#17162: 24.3; GDB interface stops working in some circumstances
Date: Tue, 1 Apr 2014 14:00:05 -0600

[Message part 1 (text/plain, inline)]

Hi Barry,

Perhaps there is some kind of misunderstanding?  M-x gud-gdb seems to
produce a prompt for gdb (have to remember not to use -i=mi for that one),
and it provides some simple support for setting breakpoints and printing
variables via the C-x C-a C-b / M-x gud-break sort of commands, but this
seems to be barely better than simpling running in a terminal.  There seems
to be no graphical representation of the point of execution, the location
of breakpoints either within the buffer or in a special breakpoint buffer,
nor a backtrace buffer, or the list of local variables (which is the only
one that I never really found very useful).

But, yes, using gud-gdb does not show the same behavior where a C-c C-c
will make the M-x gud-<something> commands stop working.  In some sense it
does indeed work better, but I have fond memories of a time where I think
that the GDB interface in Emacs was working.  Is there at least of
confirmation that others are seeing the same issue with things like M-x
gud-print stop working with M-x gdb?  I was troubleshooting with someone on
Reddit and they never saw this issue.

Zach



On Tue, Apr 1, 2014 at 1:39 PM, Barry OReilly <gundaetiapo <at> gmail.com> wrote:

> > we just stopped using GDB in Emacs long ago but I haven't given up
> > hope
>
> Does
>
>   M-x gud-gdb
>
> work better for you? The interface to GDB accessed via gdb command is
> dreadful.
>
> > As an aside, when troubleshooting this there seems to be more severe
> > but harder to reproduce issues where C-c C-c doesn't actually
> > interrupt the execution.
>
> Possibly related: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16745
>
>

[Message part 2 (text/html, inline)]

Message #14 received at 17162 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Zach Kost-Smith <zachkostsmith <at> gmail.com>
Cc: 17162 <at> debbugs.gnu.org
Subject: Re: bug#17162: 24.3; GDB interface stops working in some circumstances
Date: Wed, 14 Jul 2021 17:27:14 +0200

Zach Kost-Smith <zachkostsmith <at> gmail.com> writes:

> In the *gud-test* buffer, issue the "run" command.  Wait for a while and
> then use C-c C-c to interrupt the execution.  Use "next" a few times to
> get to line 7 of the source (the "i++;" line).
>
> At this point you can continue to issue commands from the *gud-test*
> buffer and they work fine, but if you use commands like M-x gud-print,
> M-x gud-break, etc. from the source buffers fail to do anything. 

(I'm going through old bug reports that unfortunately got no response at
the time.)

I tried reproducing this in Emacs 28, but M-x gud-break worked fine for
me after this.  So are you still seeing this issue in more recent Emacs
versions?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #19 received at 17162 <at> debbugs.gnu.org (full text, mbox):

From: Zach Kost-Smith <zachkostsmith <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 17162 <at> debbugs.gnu.org
Subject: Re: bug#17162: 24.3; GDB interface stops working in some circumstances
Date: Thu, 15 Jul 2021 08:18:19 -0500

[Message part 1 (text/plain, inline)]

Hey Lars, thanks for reaching out. I barely remember writing this report,
so please understand if I'm a bit hazy.

I'm not saying that I don't have daily issues working with gdb in emacs,
but I think it is safe to say that whatever my particular pain was back
then isn't current reproducible. Please close this report.

Thanks for your work on the Emacs.

On Wed, Jul 14, 2021, 10:27 Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> Zach Kost-Smith <zachkostsmith <at> gmail.com> writes:
>
> > In the *gud-test* buffer, issue the "run" command.  Wait for a while and
> > then use C-c C-c to interrupt the execution.  Use "next" a few times to
> > get to line 7 of the source (the "i++;" line).
> >
> > At this point you can continue to issue commands from the *gud-test*
> > buffer and they work fine, but if you use commands like M-x gud-print,
> > M-x gud-break, etc. from the source buffers fail to do anything.
>
> (I'm going through old bug reports that unfortunately got no response at
> the time.)
>
> I tried reproducing this in Emacs 28, but M-x gud-break worked fine for
> me after this.  So are you still seeing this issue in more recent Emacs
> versions?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>

[Message part 2 (text/html, inline)]

Message #22 received at 17162 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Zach Kost-Smith <zachkostsmith <at> gmail.com>
Cc: 17162 <at> debbugs.gnu.org
Subject: Re: bug#17162: 24.3; GDB interface stops working in some circumstances
Date: Thu, 15 Jul 2021 17:00:36 +0200

Zach Kost-Smith <zachkostsmith <at> gmail.com> writes:

> I'm not saying that I don't have daily issues working with gdb in
> emacs, but I think it is safe to say that whatever my particular pain
> was back then isn't current reproducible. Please close this report.

Thanks; closing.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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