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Subject: bug#51788: cua + ansi-term hangs
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Date: Fri, 12 Nov 2021 12:22:18 +0100
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Hello,

I've tried to implement a small utility function in elisp and I end up with
emacs hanged whenever certain conditions are met.

The utility has to do with sending the selected text to a term buffer and
when in the term buffer if C-c  (or C-x) is pressed, it hangs.

I 've traced the behavior and my guess it that is has to do with cua-mode.


EMACS VERSION:
I've been able to replicate the behaviour in :
- GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo
version 1.16.0)
- GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of
2020-03-26, modified by Debian


CONTEXT:

1- Open an empty emacs instance:
```
/usr/bin/emacs -q
```

2- Paste this code in a buffer (*scratch*)
```
(cua-mode t)

(defun terminal-send-selection()
  (interactive)
  (call-interactively #'kill-ring-save)
  (ansi-term "/usr/bin/bash" "test")
  (term-paste)
  )

(global-set-key [f2] 'terminal-send-selection)
```

3- Eval the buffer with the code `eval-buffer`


CASE 1 (OK):
1- Select a text in a buffer and 'M-x' `terminal-send-selection`. It opens
a terminal with the selected text pasted in it.
3- Type C-c, then prefix key is activated.
4- Type C-c again and works as expected, the pasted text is executed in
bash.

CASE 2 (PROBLEM):
1- Select a text in a buffer and use the keybind F2 instead of calling the
function manually. It opens a terminal with the selected word pasted in it.
3- Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single
core.
4- Then on a external shell:
```
kill -USR2 `pidof emacs`
```
And I get in the minibuffer.
```
Error in pre-command-hook (term-set-goto-process-mark): (quit)
```
Emacs is still hanged.
5- Repeat the command in the external shell.
```
kill -USR2 `pidof emacs`
```
And I get in *Backtrace*
```
Debugger entered--Lisp error: (quit)
```
The editor is not hanged anymore. But the behaviour is undesired.


CASE 3 (OK):
1- Don't activate cua-mode. Redo al the process but without copying the
line`(cua-mode t)`.
2- Then case 2 work as expected.


OTHER APPROACHES:
Instead of using the function "term-paste" I have also tried with.

1 - Using the function "comint-send-string".
2 - Pasting directly the test in the ansi-term buffer.

With the same results.


Why does the CASE 2 happens?
As the code is so simple I think this has to be a bug. Any help or insights
are welcome.

--000000000000a83ebf05d095acb8
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Hello,<br><br>I&#39;ve tried to implement a small utility =
function in elisp and I end up with emacs hanged whenever certain condition=
s are met.<br><br>The utility has to do with sending the selected text to a=
 term buffer and when in the term buffer if C-c=C2=A0 (or C-x) is pressed, =
it hangs.<br><br>I &#39;ve traced the behavior and my guess it that is has =
to do with cua-mode.<br><br><br>EMACS VERSION:<br>I&#39;ve been able to rep=
licate the behaviour in :<br>- GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu=
, GTK+ Version 3.24.20, cairo version 1.16.0)<br>- GNU Emacs 26.3 (build 2,=
 x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of 2020-03-26, modified by Debi=
an<br><br><br>CONTEXT:<br><br>1- Open an empty emacs instance:<br>```<br>/u=
sr/bin/emacs -q<br>```<br><br>2- Paste this code in a buffer (*scratch*)<br=
>```<br>(cua-mode t)<br><br>(defun terminal-send-selection()<br>=C2=A0 (int=
eractive)<br>=C2=A0 (call-interactively #&#39;kill-ring-save)<br>=C2=A0 (an=
si-term &quot;/usr/bin/bash&quot; &quot;test&quot;)<br>=C2=A0 (term-paste)<=
br>=C2=A0 )<br><br>(global-set-key [f2] &#39;terminal-send-selection)<br>``=
`<br><br>3- Eval the buffer with the code `eval-buffer`<br><br><br>CASE 1 (=
OK):<br>1- Select a text in a buffer and &#39;M-x&#39; `terminal-send-selec=
tion`. It opens a terminal with the selected text pasted in it.<br>3- Type =
C-c, then prefix key is activated.<br>4- Type C-c again and works as expect=
ed, the pasted text is executed in bash.<br><br>CASE 2 (PROBLEM):<br>1- Sel=
ect a text in a buffer and use the keybind F2 instead of calling the functi=
on manually. It opens a terminal with the selected word pasted in it.<br>3-=
 Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single core=
.<br>4- Then on a external shell:<br>```<br>kill -USR2 `pidof emacs`<br>```=
<br>And I get in the minibuffer.<br>```<br>Error in pre-command-hook (term-=
set-goto-process-mark): (quit)<br>```<br>Emacs is still hanged.<br>5- Repea=
t the command in the external shell.<br>```<br>kill -USR2 `pidof emacs`<br>=
```<br>And I get in *Backtrace*<br>```<br>Debugger entered--Lisp error: (qu=
it)<br>```<br>The editor is not hanged anymore. But the behaviour is undesi=
red.<br><br><br>CASE 3 (OK):<br>1- Don&#39;t activate cua-mode. Redo al the=
 process but without copying the line`(cua-mode t)`. <br>2- Then case 2 wor=
k as expected.<br><br><br>OTHER APPROACHES:<br>Instead of using the functio=
n &quot;term-paste&quot; I have also tried with.<br><br>1 - Using the funct=
ion &quot;comint-send-string&quot;.<br>2 - Pasting directly the test in the=
 ansi-term buffer.<br><br>With the same results.<br><br><br>Why does the CA=
SE 2 happens? <br>As the code is so simple I think this has to be a bug. An=
y help or insights are welcome.<br></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Samuel =?UTF-8?Q?Mu=C3=B1oz?= Hidalgo <samuel.mh@HIDDEN>
Subject: bug#51788: Acknowledgement (cua + ansi-term hangs)
Message-ID: <handler.51788.B.163671820414451.ack <at> debbugs.gnu.org>
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Date: Fri, 12 Nov 2021 11:57:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#51788: cua + ansi-term hangs
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Samuel =?UTF-8?Q?Mu=C3=B1oz?= Hidalgo <samuel.mh@HIDDEN>
Cc: 51788 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
In-Reply-To: <CA+kUYON-PNyQ1aTxR1=gRU_WTcPf41-eWHS-Cd3FXtK6SLtVpA@HIDDEN>
 ("Samuel =?UTF-8?Q?Mu=C3=B1oz?= Hidalgo"'s message of "Fri, 12 Nov 2021
 12:22:18 +0100")
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Date: Tue, 20 Sep 2022 15:22:32 +0200
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 Content preview:  Samuel =?UTF-8?Q?Mu=C3=B1oz?= Hidalgo <samuel.mh@HIDDEN> writes: > 1- Select
    a text in a buffer and use the keybind F2 instead of calling the function
    > manually. It opens a terminal with the selected word pasted in it. > 3-
    Type C-c or (C-x) and emacs freezes with [...] 
 
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Samuel Mu=C3=B1oz Hidalgo <samuel.mh@HIDDEN> writes:

> 1- Select a text in a buffer and use the keybind F2 instead of calling th=
e function
> manually. It opens a terminal with the selected word pasted in it.
> 3- Type C-c or (C-x) and emacs freezes with a 100% CPU usage in a single =
core.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

I can reproduce this in Emacs 29.  Setting debug-on-quit and hitting
`C-g' give me the following backtrace:

Debugger entered--Lisp error: (quit)
  timer--activate([t 25385 48685 328606 nil cua--prefix-override-timeout ni=
l nil 450000 nil] nil nil nil)
  timer-activate([t 25385 48685 328606 nil cua--prefix-override-timeout nil=
 nil 450000 nil])
  run-at-time(0.2 nil cua--prefix-override-timeout)
  apply(run-at-time 0.2 nil cua--prefix-override-timeout nil)
  run-with-timer(0.2 nil cua--prefix-override-timeout)
  cua--prefix-override-replay(0)
  cua-copy-handler()
  funcall-interactively(cua-copy-handler)
  call-interactively(cua-copy-handler nil nil)

I'm wholly unfamiliar with cua-mode, though.  Does anybody else know
what could be happening here?

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