GNU logs - #39343, boring messages

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Subject: bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation fault
Resent-From: Christian Johansson <christian@HIDDEN>
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Resent-Date: Wed, 29 Jan 2020 11:29:01 +0000
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To: 39343 <at> debbugs.gnu.org
From: Christian Johansson <christian@HIDDEN>
Message-ID: <f6ac77bf-ef13-c30b-07ac-26712428e652@HIDDEN>
Date: Wed, 29 Jan 2020 12:27:19 +0100
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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@HIDDEN:/.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:
RSVG DBUS GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS THREADS PDUMPER GMP

Important settings:
value of $LANG: en_GB.UTF-8
locale-coding-system: utf-8-unix

Major mode: Org

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Memory information:
((conses 16 943870 51645)
(symbols 48 80255 3)
(strings 32 259884 5972)
(string-bytes 1 7562303)
(vectors 16 102296)
(vector-slots 8 1189521 55816)
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(buffers 992 47))

-- 

Hälsningar / Best Regards
Christian

Message sent:

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Christian Johansson <christian@HIDDEN>
Subject: bug#39343: Acknowledgement (27.0.50; Thrad signal crashes Emacs
 with sgmentation fault)
Message-ID: <handler.39343.B.158029732711278.ack <at> debbugs.gnu.org>
References: <f6ac77bf-ef13-c30b-07ac-26712428e652@HIDDEN>
X-Gnu-PR-Message: ack 39343
X-Gnu-PR-Package: emacs
Reply-To: 39343 <at> debbugs.gnu.org
Date: Wed, 29 Jan 2020 11:29:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation fault
Resent-From: Alan Third <alan@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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Resent-Date: Wed, 29 Jan 2020 20:43:01 +0000
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To: Christian Johansson <christian@HIDDEN>
Cc: 39343 <at> debbugs.gnu.org
Date: Wed, 29 Jan 2020 20:42:34 +0000
From: Alan Third <alan@HIDDEN>
Message-ID: <20200129204234.GB60190@HIDDEN>
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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

Last modified: Wed, 29 Jan 2020 20:45:01 UTC

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