GNU bug report logs - #39343
27.0.50; Thrad signal crashes Emacs with sgmentation fault

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

From: Christian Johansson <christian <at> cvj.se>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Thrad signal crashes Emacs with sgmentation fault
Date: Wed, 29 Jan 2020 12:27:19 +0100

Running following works on Linux but not on macOS.

(let ((loop t)
      (iterations 1))
  (while loop
    (make-thread
     (lambda()
       (message "Thread %d" iterations)
       (signal 'error (list "My error"))))
    (setq iterations (1+ iterations))))

Error in console: Fatal error 11: Segmentation faultAbort trap: 6

It seems to be some kind of issue with quitting threads on macOS which 
is not present on Linux



In GNU Emacs 27.0.50 (build 5, x86_64-apple-darwin18.5.0, NS 
appkit-1671.40 Version 10.14.4 (Build 18E226))
of 2019-07-12 built on Christians-MacBook-Air.local
Repository revision: 8179cbff9ed37e7d8892643859adfad448ae1c7a
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1894
System Description: Mac OS X 10.15.2

Recent messages:
Getting 
/ftp:neojungiantypology.com <at> ftp.neojungiantypology.com:/.htaccess...done
Wrote /Users/christianjohansson/.emacs.d/.emacs.desktop.lock
Desktop: 1 frame, 27 buffers restored.
Initializing Hyperbole...done
Hyperbole 7.0.6 is ready for action.
For information about GNU Emacs and the GNU system, type C-h C-a.
Ispell process killed
Starting new Ispell process /usr/local/bin/hunspell with svenska 
dictionary...
Source file 
‘/Users/christianjohansson/Documents/emacs/lisp/mail/emacsbug.el’ newer 
than byte-compiled file
Source file 
‘/Users/christianjohansson/Documents/emacs/lisp/mail/sendmail.el’ newer 
than byte-compiled file

Configured features:
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NS THREADS PDUMPER GMP

Important settings:
value of $LANG: en_GB.UTF-8
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Major mode: Org

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Load-path shadows:
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/Users/christianjohansson/.emacs.d/phps-mode/phps-mode-semantic hides 
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/Users/christianjohansson/.emacs.d/ssh-deploy/ssh-deploy-hydra hides 
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/Users/christianjohansson/.emacs.d/elpa/less-css-mode-20161001.453/less-css-mode 
hides /Users/christianjohansson/Documents/emacs/lisp/textmodes/less-css-mode
/Users/christianjohansson/.emacs.d/elpa/let-alist-1.0.6/let-alist hides 
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/Users/christianjohansson/Documents/emacs/lisp/sb-image hides 
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/Users/christianjohansson/Documents/emacs/lisp/url/url-ns hides 
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-- 

Hälsningar / Best Regards
Christian

Message #8 received at 39343 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Christian Johansson <christian <at> cvj.se>
Cc: 39343 <at> debbugs.gnu.org
Subject: Re: bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation
 fault
Date: Wed, 29 Jan 2020 20:42:34 +0000

On Wed, Jan 29, 2020 at 12:27:19PM +0100, Christian Johansson wrote:
> Running following works on Linux but not on macOS.
> 
> (let ((loop t)
>       (iterations 1))
>   (while loop
>     (make-thread
>      (lambda()
>        (message "Thread %d" iterations)
>        (signal 'error (list "My error"))))
>     (setq iterations (1+ iterations))))
> 
> Error in console: Fatal error 11: Segmentation faultAbort trap: 6
> 
> It seems to be some kind of issue with quitting threads on macOS which is
> not present on Linux

It’s a stack overflow caused by the main thread getting stuck in a
loop processing calls to ns_send_appdefined which must be coming from
the 2000‐odd threads the script starts.

Presumably it’s the call to ns_run_loop_break in sys_cond_broadcast
that’s doing it.

I don’t think there’s really any way round this other than the massive
rewrite the NS port needs to make it handle threads correctly.

-- 
Alan Third

Message #11 received at 39343 <at> debbugs.gnu.org (full text, mbox):

From: Christian Johansson <christian <at> cvj.se>
To: Alan Third <alan <at> idiocy.org>
Cc: 39343 <at> debbugs.gnu.org
Subject: Re: bug#39343: 27.0.50;
 Thrad signal crashes Emacs with sgmentation fault
Date: Wed, 29 Jan 2020 22:05:57 +0100

Hi

I understand, wish I had the skills to help with that but my C is weak and my macOS internals is even weaker.

Sometimes I get another thread issue on macOS. It also crashes Emacs but the error is something about try to clear a pointer that doesn’t point to anything anymore. Would it be helpful if I try to find a reproducable way of causing that and file another issue? It seems to occur non-determinstically so I haven’t been able to reproduce it yet. Could perhaps depend on garbage collector and maybe some kind of race-condition..

I have two plugins for Emacs that would improve significantly with stable thread support but at the moment it seems threads are unstable on macOS. I have not experienced any issues on Linux. Async.el works but it adds unecessary overhead by launching a separate Emacs process and it would be nice to not need it.

Kind regards
Christian

> 29 jan. 2020 kl. 21:42 skrev Alan Third <alan <at> idiocy.org>:
> 
>> On Wed, Jan 29, 2020 at 12:27:19PM +0100, Christian Johansson wrote:
>> Running following works on Linux but not on macOS.
>> 
>> (let ((loop t)
>>       (iterations 1))
>>   (while loop
>>     (make-thread
>>      (lambda()
>>        (message "Thread %d" iterations)
>>        (signal 'error (list "My error"))))
>>     (setq iterations (1+ iterations))))
>> 
>> Error in console: Fatal error 11: Segmentation faultAbort trap: 6
>> 
>> It seems to be some kind of issue with quitting threads on macOS which is
>> not present on Linux
> 
> It’s a stack overflow caused by the main thread getting stuck in a
> loop processing calls to ns_send_appdefined which must be coming from
> the 2000‐odd threads the script starts.
> 
> Presumably it’s the call to ns_run_loop_break in sys_cond_broadcast
> that’s doing it.
> 
> I don’t think there’s really any way round this other than the massive
> rewrite the NS port needs to make it handle threads correctly.
> 
> -- 
> Alan Third

Message #14 received at 39343 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Alan Third <alan <at> idiocy.org>
Cc: Christian Johansson <christian <at> cvj.se>, 39343 <at> debbugs.gnu.org
Subject: Re: bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation
 fault
Date: Wed, 20 Oct 2021 11:05:38 +0800

Alan Third <alan <at> idiocy.org> writes:

> I don’t think there’s really any way round this other than the massive
> rewrite the NS port needs to make it handle threads correctly.

I don't understand the precise problem here (nor do I understand the
thread code.)  Could you elaborate on what the problem is, and why it
requires a massive rewrite?  Thanks.

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