bug#34690: 26.1; Emacs gets stuck when replacing text

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernandez]

Exactly after pressing M-% to replace text, Emacs gets stuck. The emacs
process was using 90% of the CPU until I killed the process.  The
problem started when I customize the font. If I comment the lines that
Custom added to the ".emacs" file, then the problem disappeared.

The lines added by Custom are the following:

(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
 normal :weight normal :height 128 :width normal)))))


In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2019-02-14 built on canelo
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Linux Mint 17.2 Rafaela

Recent messages:
Wrote /home/daniel/*message*-20190228-194721
Mark set
Saving file /home/daniel/.emacs...
Wrote /home/daniel/.emacs [2 times]
Sending...
Mark set [2 times]
Sending via mail...
Sending...done
next-line: End of buffer [3 times]
previous-line: Beginning of buffer
next-line: End of buffer
Configured using:
 'configure --with-mailutils'

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bug#34690: 26.1; Emacs gets stuck when replacing text

[Eli Zaretskii]

> Date: Thu, 28 Feb 2019 20:16:55 -0300
> From: Daniel Hernandez <daniel@degu.cl>
> 
> 
> Exactly after pressing M-% to replace text, Emacs gets stuck. The emacs
> process was using 90% of the CPU until I killed the process.  The
> problem started when I customize the font. If I comment the lines that
> Custom added to the ".emacs" file, then the problem disappeared.

Does this happen with any text in any buffer, and with any search and
replacement strings? or just with some?

> The lines added by Custom are the following:
> 
> (custom-set-faces
>  ;; custom-set-faces was added by Custom.
>  ;; If you edit it by hand, you could mess it up, so be careful.
>  ;; Your init file should contain only one such instance.
>  ;; If there is more than one, they won't work right.
>  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
>  normal :weight normal :height 128 :width normal)))))

Only with this particular font, or with any font?

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernandez]

 ---- On vie, 01 mar 2019 04:36:47 -0300 Eli Zaretskii <eliz@gnu.org> wrote ---- 
 > > Date: Thu, 28 Feb 2019 20:16:55 -0300 
 > > From: Daniel Hernandez <daniel@degu.cl> 
 > >  
 > >  
 > > Exactly after pressing M-% to replace text, Emacs gets stuck. The emacs 
 > > process was using 90% of the CPU until I killed the process.  The 
 > > problem started when I customize the font. If I comment the lines that 
 > > Custom added to the ".emacs" file, then the problem disappeared. 
 >  
 > Does this happen with any text in any buffer, and with any search and 
 > replacement strings? or just with some? 
 
It happens with any buffer; even with an empty one.
This problem occurs also when I only have that lines in
the ".emacs" file.
  
 > > The lines added by Custom are the following: 
 > >  
 > > (custom-set-faces 
 > >  ;; custom-set-faces was added by Custom. 
 > >  ;; If you edit it by hand, you could mess it up, so be careful. 
 > >  ;; Your init file should contain only one such instance. 
 > >  ;; If there is more than one, they won't work right. 
 > >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant 
 > >  normal :weight normal :height 128 :width normal))))) 
 >  
 > Only with this particular font, or with any font? 
 
I noticed that it occurs with some font and it does not occur
with other. For instance, it does not occur with DejaVu Sans
Mono. That is, it does not occur with the following lines:

(custom-set-faces
 ;; custom-set-faces was added by Custom.
 ;; If you edit it by hand, you could mess it up, so be careful.
 ;; Your init file should contain only one such instance.
 ;; If there is more than one, they won't work right.
 '(default ((t (:family "DejaVu Sans Mono" :foundry "unknown"
 :slant normal :weight normal :height 98 :width normal)))))

Another detail. When it occurs the text "Query replace:" is
not showed.

bug#34690: 26.1; Emacs gets stuck when replacing text

[Eli Zaretskii]

> Date: Fri, 01 Mar 2019 11:37:10 -0300
> From: Daniel Hernandez <daniel@degu.cl>
> Cc: "34690" <34690@debbugs.gnu.org>
> 
>  > Does this happen with any text in any buffer, and with any search and 
>  > replacement strings? or just with some? 
>  
> It happens with any buffer; even with an empty one.
> This problem occurs also when I only have that lines in
> the ".emacs" file.
>   
>  > > The lines added by Custom are the following: 
>  > >  
>  > > (custom-set-faces 
>  > >  ;; custom-set-faces was added by Custom. 
>  > >  ;; If you edit it by hand, you could mess it up, so be careful. 
>  > >  ;; Your init file should contain only one such instance. 
>  > >  ;; If there is more than one, they won't work right. 
>  > >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant 
>  > >  normal :weight normal :height 128 :width normal))))) 
>  >  
>  > Only with this particular font, or with any font? 
>  
> I noticed that it occurs with some font and it does not occur
> with other. For instance, it does not occur with DejaVu Sans
> Mono. That is, it does not occur with the following lines:
> 
> (custom-set-faces
>  ;; custom-set-faces was added by Custom.
>  ;; If you edit it by hand, you could mess it up, so be careful.
>  ;; Your init file should contain only one such instance.
>  ;; If there is more than one, they won't work right.
>  '(default ((t (:family "DejaVu Sans Mono" :foundry "unknown"
>  :slant normal :weight normal :height 98 :width normal)))))

Can you try the latest pretest of Emacs 26.2?  Maybe this problem is
already fixed.

If Emacs 26.2 also has this problem, the next step is to attach GDB to
Emacs when this happens and use the technique described in etc/DEBUG
to find out where it loops.

> Another detail. When it occurs the text "Query replace:" is
> not showed.

This is consistent with redisplay looping.

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernandez]

 ---- On vie, 01 mar 2019 11:48:16 -0300 Eli Zaretskii <eliz@gnu.org> wrote ----
 > > Date: Fri, 01 Mar 2019 11:37:10 -0300 
 > > From: Daniel Hernandez <daniel@degu.cl> 
 > > Cc: "34690" <34690@debbugs.gnu.org> 
 > >  
 > >  > Does this happen with any text in any buffer, and with any search and  
 > >  > replacement strings? or just with some?  
 > >   
 > > It happens with any buffer; even with an empty one. 
 > > This problem occurs also when I only have that lines in 
 > > the ".emacs" file. 
 > >    
 > >  > > The lines added by Custom are the following:  
 > >  > >   
 > >  > > (custom-set-faces  
 > >  > >  ;; custom-set-faces was added by Custom.  
 > >  > >  ;; If you edit it by hand, you could mess it up, so be careful.  
 > >  > >  ;; Your init file should contain only one such instance.  
 > >  > >  ;; If there is more than one, they won't work right.  
 > >  > >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant  
 > >  > >  normal :weight normal :height 128 :width normal)))))  
 > >  >   
 > >  > Only with this particular font, or with any font?  
 > >   
 > > I noticed that it occurs with some font and it does not occur 
 > > with other. For instance, it does not occur with DejaVu Sans 
 > > Mono. That is, it does not occur with the following lines: 
 > >  
 > > (custom-set-faces 
 > >  ;; custom-set-faces was added by Custom. 
 > >  ;; If you edit it by hand, you could mess it up, so be careful. 
 > >  ;; Your init file should contain only one such instance. 
 > >  ;; If there is more than one, they won't work right. 
 > >  '(default ((t (:family "DejaVu Sans Mono" :foundry "unknown" 
 > >  :slant normal :weight normal :height 98 :width normal))))) 
 >  
 > Can you try the latest pretest of Emacs 26.2?  Maybe this problem is 
 > already fixed. 
 >  
 > If Emacs 26.2 also has this problem, the next step is to attach GDB to 
 > Emacs when this happens and use the technique described in etc/DEBUG 
 > to find out where it loops. 
 
I will try with the latest pretest of Emacs 26.2 (probably the next week).

 > > Another detail. When it occurs the text "Query replace:" is 
 > > not showed. 
 >  
 > This is consistent with redisplay looping. 
 > 

bug#34690: 26.1; Emacs gets stuck when replacing text

[Noam Postavsky]

Daniel Hernandez <daniel@degu.cl> writes:

> Exactly after pressing M-% to replace text, Emacs gets stuck. The emacs
> process was using 90% of the CPU until I killed the process.  The
> problem started when I customize the font. If I comment the lines that
> Custom added to the ".emacs" file, then the problem disappeared.
>
> The lines added by Custom are the following:
>
> (custom-set-faces
>  ;; custom-set-faces was added by Custom.
>  ;; If you edit it by hand, you could mess it up, so be careful.
>  ;; Your init file should contain only one such instance.
>  ;; If there is more than one, they won't work right.
>  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
>  normal :weight normal :height 128 :width normal)))))

Does (setq query-replace-from-to-separator " -> ") avoid the problem (as
suggested in Bug#30291)?

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernández]

On Mon, 01 Apr 2019 21:34:26 -0400
Noam Postavsky <npostavs@gmail.com> wrote:

> Daniel Hernandez <daniel@degu.cl> writes:
> 
> > Exactly after pressing M-% to replace text, Emacs gets stuck. The
> > emacs process was using 90% of the CPU until I killed the process.
> > The problem started when I customize the font. If I comment the
> > lines that Custom added to the ".emacs" file, then the problem
> > disappeared.
> >
> > The lines added by Custom are the following:
> >
> > (custom-set-faces
> >  ;; custom-set-faces was added by Custom.
> >  ;; If you edit it by hand, you could mess it up, so be careful.
> >  ;; Your init file should contain only one such instance.
> >  ;; If there is more than one, they won't work right.
> >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
> >  normal :weight normal :height 128 :width normal)))))
> 
> Does (setq query-replace-from-to-separator " -> ") avoid the problem
> (as suggested in Bug#30291)?

Yes, this solve the issue in the computer where I detected the issue. I
have another computer where that code is not needed, because there is
no problem with the inconsolata font.

bug#34690: 26.1; Emacs gets stuck when replacing text

[Eli Zaretskii]

> Date: Tue, 2 Apr 2019 23:43:13 -0300
> From: Daniel Hernández <daniel@degu.cl>
> Cc: 34690@debbugs.gnu.org
> 
> > > (custom-set-faces
> > >  ;; custom-set-faces was added by Custom.
> > >  ;; If you edit it by hand, you could mess it up, so be careful.
> > >  ;; Your init file should contain only one such instance.
> > >  ;; If there is more than one, they won't work right.
> > >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
> > >  normal :weight normal :height 128 :width normal)))))
> > 
> > Does (setq query-replace-from-to-separator " -> ") avoid the problem
> > (as suggested in Bug#30291)?
> 
> Yes, this solve the issue in the computer where I detected the issue. I
> have another computer where that code is not needed, because there is
> no problem with the inconsolata font.

It would be good to discover where Emacs loops with the problematic
font, so we could at least try to present some meaningful error
message, if not avoid this entirely.  It would help if someone who can
reproduce the problem used the technique in etc/DEBUG for finding the
place in the code where we loop.

Thanks.

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernández]

On Wed, 03 Apr 2019 08:01:48 +0300
Eli Zaretskii <eliz@gnu.org> wrote:

> > Date: Tue, 2 Apr 2019 23:43:13 -0300
> > From: Daniel Hernández <daniel@degu.cl>
> > Cc: 34690@debbugs.gnu.org
> > 
> > > > (custom-set-faces
> > > >  ;; custom-set-faces was added by Custom.
> > > >  ;; If you edit it by hand, you could mess it up, so be careful.
> > > >  ;; Your init file should contain only one such instance.
> > > >  ;; If there is more than one, they won't work right.
> > > >  '(default ((t (:family "Inconsolata" :foundry "unknown" :slant
> > > >  normal :weight normal :height 128 :width normal)))))
> > > 
> > > Does (setq query-replace-from-to-separator " -> ") avoid the
> > > problem (as suggested in Bug#30291)?
> > 
> > Yes, this solve the issue in the computer where I detected the
> > issue. I have another computer where that code is not needed,
> > because there is no problem with the inconsolata font.
> 
> It would be good to discover where Emacs loops with the problematic
> font, so we could at least try to present some meaningful error
> message, if not avoid this entirely.  It would help if someone who can
> reproduce the problem used the technique in etc/DEBUG for finding the
> place in the code where we loop.

I will try that next week.

Daniel

bug#34690: 26.1; Emacs gets stuck when replacing text

[Lars Ingebrigtsen]

Daniel Hernández <daniel@degu.cl> writes:

>> It would be good to discover where Emacs loops with the problematic
>> font, so we could at least try to present some meaningful error
>> message, if not avoid this entirely.  It would help if someone who can
>> reproduce the problem used the technique in etc/DEBUG for finding the
>> place in the code where we loop.
>
> I will try that next week.

Daniel, did you make any progress on debugging this?

M-: (message "%s" query-replace-from-to-separator) RET

should probably reproduce the error if your Emacs is just having problem
displaying that character.

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

bug#34690: 26.1; Emacs gets stuck when replacing text

[Daniel Hernandez]

Lars Ingebrigtsen writes:

> Daniel Hernández <daniel@degu.cl> writes:
>
>>> It would be good to discover where Emacs loops with the problematic
>>> font, so we could at least try to present some meaningful error
>>> message, if not avoid this entirely.  It would help if someone who can
>>> reproduce the problem used the technique in etc/DEBUG for finding the
>>> place in the code where we loop.
>>
>> I will try that next week.
>
> Daniel, did you make any progress on debugging this?
>
> M-: (message "%s" query-replace-from-to-separator) RET
>
> should probably reproduce the error if your Emacs is just having problem
> displaying that character.

Sorry! I did not try finding the bug that week, because I was too
busy. I changed then the computer by a newer one. The bug does not occur
on my new computer, so I cannot reproduce it now. I Remember I was
working with Linux Mint 17.2.

--
Daniel

bug#34690: 26.1; Emacs gets stuck when replacing text

[Lars Ingebrigtsen]

Daniel Hernandez <daniel@degu.cl> writes:

> Sorry! I did not try finding the bug that week, because I was too
> busy. I changed then the computer by a newer one. The bug does not occur
> on my new computer, so I cannot reproduce it now. I Remember I was
> working with Linux Mint 17.2.

Thanks for checking.

It seems unlikely that there'll be further progress with this bug
report, so I'm closing it.  If further progress can be made, somebody
should follow up with an email, and we'll reopen the bug report.

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