bug#21718: 24.5; Backgrounding emacsclient hangs emacs

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

I am running emacs from a text ssh session.

% emacs -Q
M-x server-start RET
M-x shell RET
% touch foo
% emacsclient foo
C-x b RET                  (switch back to shell buffer)
M-x comint-stop-subjob RET

I expected this to background the emacsclient process within the shell
window.  But it causes all of emacs to disappear from the screen, back
to the original shell prompt that launched emacs, where the emacs
process appears to have hung and can only be killed with C-c.



In GNU Emacs 24.5.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.16.6)
 of 2015-09-14 on buildvm-10.phx2.fedoraproject.org
Configured using:
 `configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4
 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
 -m64 -mtune=generic' LDFLAGS=-Wl,-z,relro'

Important settings:
  value of $LC_COLLATE: C
  value of $LC_CTYPE: en_GB.UTF-8
  value of $LC_MESSAGES: en_GB.UTF-8
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  show-paren-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Loading /usr/share/emacs/site-lisp/site-start.d/puppet-mode-init.el (source)...done
Loading /usr/share/emacs/site-lisp/site-start.d/rpmdev-init.el (source)...done
Loading compile...done
Loading /home/eda/lib/emacs/csharp-mode-0.8.5.el
lib/emacs/csharp-mode-0.8.5.el: `flet' is an obsolete macro (as of 24.3); use either `cl-flet' or `cl-letf'. [2 times]
lib/emacs/csharp-mode-0.8.5.el: (lambda (item) ...) quoted with ' rather than with #'
Done loading /home/eda/lib/emacs/csharp-mode-0.8.5.el
Loading log-edit...done
Loading term/xterm...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug sendmail xterm time-date paren
log-edit easy-mmode message format-spec rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util
add-log warnings server csharp-mode advice help-fns byte-opt bytecomp
byte-compile cl-extra cconv cc-langs cc-mode cc-fonts easymenu cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs zoom-frm
frame-cmds frame-fns cl-macs avoid cl gv cl-loaddefs cl-lib compile
shell pcomplete comint ring ansi-color tooltip electric uniquify
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
prog-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 nadvice 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 gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 139426 4026)
 (symbols 48 22703 0)
 (miscs 40 90 93)
 (strings 32 24674 4900)
 (string-bytes 1 863595)
 (vectors 16 12515)
 (vector-slots 8 394759 2869)
 (floats 8 80 207)
 (intervals 56 226 0)
 (buffers 960 14)
 (heap 1024 40722 843))

Please ignore autogenerated disclaimer below this point.

This email is intended only for the person to whom it is addressed and may contain confidential information. Any retransmission, copying, disclosure or other use of, this information by persons other than the intended recipient is prohibited. If you received this email in error, please contact the sender and delete the material. This email is for information only and is not intended as an offer or solicitation for the purchase or sale of any financial instrument. Wadhwani Asset Management LLP is a Limited Liability Partnership registered in England (OC303168) with registered office at 40 Berkeley Square, 3rd Floor, London, W1J 5AL. It is authorised and regulated by the Financial Conduct Authority.

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Glenn Morris]

Ed Avis wrote:

> I am running emacs from a text ssh session.
>
> % emacs -Q
> M-x server-start RET
> M-x shell RET
> % touch foo
> % emacsclient foo
> C-x b RET                  (switch back to shell buffer)
> M-x comint-stop-subjob RET
>
> I expected this to background the emacsclient process within the shell
> window. 

It sends SIGSTOP.

I know this isn't very helpful, but the only thing I can think to say is
"don't do that". Either use the normal C-x C-f to open a file, or if you
must call emacsclient from within a shell inside Emacs (?!), use the
--no-wait option.

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

On 2015-10-21, 18:44, "Glenn Morris" <rgm@gnu.org> wrote:

>> % emacsclient foo
>> C-x b RET                  (switch back to shell buffer)
>> M-x comint-stop-subjob RET
>>
>> I expected this to background the emacsclient process within the shell
>> window. 
>
>It sends SIGSTOP.

There's more to it than that.  'killall -STOP emacsclient' works fine and suspends the
emacsclient process as expected.  And C-c C-c in the shell buffer, sending SIGTERM to
the emacsclient process, also works.  What is comint-stop-subjob doing which is more than
just sending the SIGSTOP?

By the way, running emacsclient inside an emacs shell buffer is quite common for me.
For example on 'git commit' or 'git rebase' etc, which prompt for a log message.
Simple version control operations can be done from emacs itself with vc-mode or other
libraries, but sometimes you want to go to the shell and run the raw git commands.
The same is true of other version control systems.

-- 
Ed Avis <eda@waniasset.com>
Please ignore autogenerated disclaimer below this point.



This email is intended only for the person to whom it is addressed and may contain confidential information. Any retransmission, copying, disclosure or other use of, this information by persons other than the intended recipient is prohibited. If you received this email in error, please contact the sender and delete the material. This email is for information only and is not intended as an offer or solicitation for the purchase or sale of any financial instrument. Wadhwani Asset Management LLP is a Limited Liability Partnership registered in England (OC303168) with registered office at 40 Berkeley Square, 3rd Floor, London, W1J 5AL. It is authorised and regulated by the Financial Conduct Authority.

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Lars Ingebrigtsen]

Ed Avis <eda@waniasset.com> writes:

> I am running emacs from a text ssh session.
>
> % emacs -Q
> M-x server-start RET
> M-x shell RET
> % touch foo
> % emacsclient foo
> C-x b RET                  (switch back to shell buffer)
> M-x comint-stop-subjob RET
>
> I expected this to background the emacsclient process within the shell
> window.  But it causes all of emacs to disappear from the screen, back
> to the original shell prompt that launched emacs, where the emacs
> process appears to have hung and can only be killed with C-c.

(I'm going through old bug reports that unfortunately got little response at
the time.)

I tried this in Emacs 25.1 (and Emacs 28), but was unable to reproduce
the problem.  Are you still seeing this issue in newer Emacs versions?

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

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

[-- Attachment #1: Type: text/plain, Size: 2346 bytes --]

Following the original recipe I'm seeing a slightly different crash.  Emacs doesn't exit all the way back to the original shell prompt but hangs instead.  The output left on the screen looks fun:

Waiting for Emacs...  M-x c o m i n t - s t o p - s u b j o b RET
[1]+  Stopped                 emacsclient foo
eda@qmaw-linux05 ~ $
-UUU:**--F1  *shell*        Bot L16838  (Shell:run) --------------------------------------------------------------------

Please ignore confidentiality gunk below this point.

This email and any files transmitted with it are CONFIDENTIAL and are intended solely for the use of the individual(s) or entity to whom they are addressed. Any unauthorised copying, disclosure or distribution of the material within this email is strictly forbidden. Any views or opinions presented within this email are solely those of the author and do not necessarily represent those of PGIM Limited, QMA Wadhwani LLP or their affiliates unless otherwise specifically stated. An electronic message is not binding on its sender. Any message referring to a binding agreement must be confirmed in writing and duly signed. If you have received this email in error, please notify the sender immediately and delete the original. Telephone, electronic and other communications and conversations with PGIM Limited, QMA Wadhwani LLP and/or their associated persons may be recorded and retained. PGIM Limited and QMA Wadhwani LLP are authorised and regulated by the Financial Conduct Authority. PGIM Limited (registered in England No. 3809039) has its registered office at Grand Buildings, 1-3 Strand, Trafalgar Square, London WC2N 5HR and QMA Wadhwani LLP (registered in England No. OC303168) has its registered office at 9th Floor, Orion House, 5 Upper St. Martin's Lane, London, England, WC2H 9EA.

Please note that your personal information may be stored and processed in any country where we have facilities or in which we engage service providers. If you provide personal information to us by email or otherwise, you consent to the transfer of that information to countries outside of your country of residence and these countries may have different data protection rules than your country.

To learn about our privacy policies, please use this link<https://www.pgim.com/disclaimer/privacy-center> to read the Privacy Notices.

[-- Attachment #2: Type: text/html, Size: 3393 bytes --]

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Lars Ingebrigtsen]

Ed Avis <ed.avis@qmaw.com> writes:

> Following the original recipe I'm seeing a slightly different crash.  Emacs doesn't
> exit all the way back to the original shell prompt but hangs instead.  The output
> left on the screen looks fun:
>
> Waiting for Emacs...  M-x c o m i n t - s t o p - s u b j o b RET 
> [1]+  Stopped                 emacsclient foo
> eda@qmaw-linux05 ~ $
> -UUU:**--F1  *shell*        Bot L16838  (Shell:run)
> --------------------------------------------------------------------

Hm...  well, isn't that back to the original shell prompt?  (In the
shell buffer.)

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

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

[-- Attachment #1: Type: text/plain, Size: 2036 bytes --]

I meant that originally, on killing the emacsclient process, the whole emacs process would kaboom.  Now the emacs process seems to hang instead of exiting altogether, but it's just as bad an outcome.


This email and any files transmitted with it are CONFIDENTIAL and are intended solely for the use of the individual(s) or entity to whom they are addressed. Any unauthorised copying, disclosure or distribution of the material within this email is strictly forbidden. Any views or opinions presented within this email are solely those of the author and do not necessarily represent those of PGIM Limited, QMA Wadhwani LLP or their affiliates unless otherwise specifically stated. An electronic message is not binding on its sender. Any message referring to a binding agreement must be confirmed in writing and duly signed. If you have received this email in error, please notify the sender immediately and delete the original. Telephone, electronic and other communications and conversations with PGIM Limited, QMA Wadhwani LLP and/or their associated persons may be recorded and retained. PGIM Limited and QMA Wadhwani LLP are authorised and regulated by the Financial Conduct Authority. PGIM Limited (registered in England No. 3809039) has its registered office at Grand Buildings, 1-3 Strand, Trafalgar Square, London WC2N 5HR and QMA Wadhwani LLP (registered in England No. OC303168) has its registered office at 9th Floor, Orion House, 5 Upper St. Martin's Lane, London, England, WC2H 9EA.

Please note that your personal information may be stored and processed in any country where we have facilities or in which we engage service providers. If you provide personal information to us by email or otherwise, you consent to the transfer of that information to countries outside of your country of residence and these countries may have different data protection rules than your country.

To learn about our privacy policies, please use this link<https://www.pgim.com/disclaimer/privacy-center> to read the Privacy Notices.

[-- Attachment #2: Type: text/html, Size: 2620 bytes --]

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

[-- Attachment #1: Type: text/plain, Size: 1865 bytes --]

P.S. this is GNU Emacs 27.1.


This email and any files transmitted with it are CONFIDENTIAL and are intended solely for the use of the individual(s) or entity to whom they are addressed. Any unauthorised copying, disclosure or distribution of the material within this email is strictly forbidden. Any views or opinions presented within this email are solely those of the author and do not necessarily represent those of PGIM Limited, QMA Wadhwani LLP or their affiliates unless otherwise specifically stated. An electronic message is not binding on its sender. Any message referring to a binding agreement must be confirmed in writing and duly signed. If you have received this email in error, please notify the sender immediately and delete the original. Telephone, electronic and other communications and conversations with PGIM Limited, QMA Wadhwani LLP and/or their associated persons may be recorded and retained. PGIM Limited and QMA Wadhwani LLP are authorised and regulated by the Financial Conduct Authority. PGIM Limited (registered in England No. 3809039) has its registered office at Grand Buildings, 1-3 Strand, Trafalgar Square, London WC2N 5HR and QMA Wadhwani LLP (registered in England No. OC303168) has its registered office at 9th Floor, Orion House, 5 Upper St. Martin's Lane, London, England, WC2H 9EA.

Please note that your personal information may be stored and processed in any country where we have facilities or in which we engage service providers. If you provide personal information to us by email or otherwise, you consent to the transfer of that information to countries outside of your country of residence and these countries may have different data protection rules than your country.

To learn about our privacy policies, please use this link<https://www.pgim.com/disclaimer/privacy-center> to read the Privacy Notices.

[-- Attachment #2: Type: text/html, Size: 2398 bytes --]

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Lars Ingebrigtsen]

Ed Avis <ed.avis@qmaw.com> writes:

> I meant that originally, on killing the emacsclient process, the whole emacs
> process would kaboom.  Now the emacs process seems to hang instead of exiting
> altogether, but it's just as bad an outcome.

The outer Emacs process doesn't seem to hang for me?  The inner Emacs
process is stopped, and the outer process works as normal, as far as I
can tell?

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

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

[-- Attachment #1: Type: text/plain, Size: 2300 bytes --]

For me the whole emacs process (outer one) hangs.  Normal Emacs keystrokes like C-g have no effect and it doesn't update the screen (so pressing Enter adds a blank line and scrolls up the whole screen).  I have to kill(1) it.

Since you've also followed the recipe and not seen the same result, I will check again carefully that there isn't some hidden step or configuration that triggers it.  I was running under GNU screen, which might have affected it somehow.

This email and any files transmitted with it are CONFIDENTIAL and are intended solely for the use of the individual(s) or entity to whom they are addressed. Any unauthorised copying, disclosure or distribution of the material within this email is strictly forbidden. Any views or opinions presented within this email are solely those of the author and do not necessarily represent those of PGIM Limited, QMA Wadhwani LLP or their affiliates unless otherwise specifically stated. An electronic message is not binding on its sender. Any message referring to a binding agreement must be confirmed in writing and duly signed. If you have received this email in error, please notify the sender immediately and delete the original. Telephone, electronic and other communications and conversations with PGIM Limited, QMA Wadhwani LLP and/or their associated persons may be recorded and retained. PGIM Limited and QMA Wadhwani LLP are authorised and regulated by the Financial Conduct Authority. PGIM Limited (registered in England No. 3809039) has its registered office at Grand Buildings, 1-3 Strand, Trafalgar Square, London WC2N 5HR and QMA Wadhwani LLP (registered in England No. OC303168) has its registered office at 9th Floor, Orion House, 5 Upper St. Martin's Lane, London, England, WC2H 9EA.

Please note that your personal information may be stored and processed in any country where we have facilities or in which we engage service providers. If you provide personal information to us by email or otherwise, you consent to the transfer of that information to countries outside of your country of residence and these countries may have different data protection rules than your country.

To learn about our privacy policies, please use this link<https://www.pgim.com/disclaimer/privacy-center> to read the Privacy Notices.

[-- Attachment #2: Type: text/html, Size: 3154 bytes --]

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Ed Avis]

I've gone back to the original recipe, with no GNU screen and no .bashrc file to set environment variables.  It's as I described it back in 2015:

I am running emacs from a text ssh session.

% emacs -Q
M-x server-start RET
M-x shell RET
% touch foo
% emacsclient foo
C-x b RET                  (switch back to shell buffer)
M-x comint-stop-subjob RET

I expected this to background the emacsclient process within the shell
window.  But it causes all of emacs to disappear from the screen, back
to the original shell prompt that launched emacs, where the emacs
process appears to have hung and can only be killed with C-c.

This is emacs-27.1 running on RHEL 8.4.  The build was originally derived from Fedora Linux but I rebuilt it on RHEL.  Do you want me to try a completely vanilla build from the tarball?

This email and any files transmitted with it are CONFIDENTIAL and are intended solely for the use of the individual(s) or entity to whom they are addressed. Any unauthorised copying, disclosure or distribution of the material within this email is strictly forbidden. Any views or opinions presented within this email are solely those of the author and do not necessarily represent those of PGIM Limited, QMA Wadhwani LLP or their affiliates unless otherwise specifically stated. An electronic message is not binding on its sender. Any message referring to a binding agreement must be confirmed in writing and duly signed. If you have received this email in error, please notify the sender immediately and delete the original. Telephone, electronic and other communications and conversations with PGIM Limited, QMA Wadhwani LLP and/or their associated persons may be recorded and retained. PGIM Limited and QMA Wadhwani LLP are authorised and regulated by the Financial Conduct Authority. PGIM Limited (registered in England No. 3809039) has its registered office at Grand Buildings, 1-3 Strand, Trafalgar Square, London WC2N 5HR and QMA Wadhwani LLP (registered in England No. OC303168) has its registered office at 9th Floor, Orion House, 5 Upper St. Martin's Lane, London, England, WC2H 9EA.

Please note that your personal information may be stored and processed in any country where we have facilities or in which we engage service providers. If you provide personal information to us by email or otherwise, you consent to the transfer of that information to countries outside of your country of residence and these countries may have different data protection rules than your country.

To learn about our privacy policies, please use this link<https://www.pgim.com/disclaimer/privacy-center> to read the Privacy Notices.

bug#21718: 24.5; Backgrounding emacsclient hangs emacs

[Lars Ingebrigtsen]

Ed Avis <ed.avis@qmaw.com> writes:

> I've gone back to the original recipe, with no GNU screen and no
> .bashrc file to set environment variables.  It's as I described it
> back in 2015:
>
> I am running emacs from a text ssh session.
>
> % emacs -Q
> M-x server-start RET
> M-x shell RET
> % touch foo
> % emacsclient foo
> C-x b RET                  (switch back to shell buffer)
> M-x comint-stop-subjob RET

Ah -- I was running the outer Emacs as a graphical Emacs.  With "emacs
-Q -nw" I can reproduce the problem.

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