GNU bug report logs - #32552
Core dump of Emacs 26.1 due to elisp variable definition

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

From: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
To: <bug-gnu-emacs <at> gnu.org>
Cc: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
Subject: Core dump of Emacs 26.1 due to elisp variable definition
Date: Tue, 28 Aug 2018 08:05:42 +0200

[Message part 1 (text/plain, inline)]

Hello,

the following piece of elisp crashes Emacs 26.1 (core dump):

> ;;; -*- lexical-binding: t -*-
> (defvar ;dead-beef* (symbol-function #'dead-beef)
>     "Some random description")

Note a couple of things:

- lexical binding seems to be important (otherwise no crash)

- ; seems to be the major cause

- the variable definition must be split across two lines

Please find attached a minimal proof of concept. You should be able to
reproduce the crash with 'emacs -Q --script test_min.el'.

Best regards,

Thomas

-- 
Thomas Barabosch

Fraunhofer FKIE                        Tel.:   +49 228 50212-601
Cyber Analysis & Defense               Fax:    +49 228 73-4571
Zanderstraße 5                         D-53113 Bonn, Germany
http://www.fkie.fraunhofer.de/

[test_min.el (text/plain, attachment)]

Message #8 received at 32552 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: "Barabosch\, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
Cc: 32552 <at> debbugs.gnu.org
Subject: Re: bug#32552: Core dump of Emacs 26.1 due to elisp variable
 definition
Date: Tue, 28 Aug 2018 10:22:12 +0300

> From: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
> Date: Tue, 28 Aug 2018 08:05:42 +0200
> Cc: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
> 
> the following piece of elisp crashes Emacs 26.1 (core dump):
> 
> > ;;; -*- lexical-binding: t -*-
> > (defvar ;dead-beef* (symbol-function #'dead-beef)
> >     "Some random description")
> 
> Note a couple of things:
> 
> - lexical binding seems to be important (otherwise no crash)
> 
> - ; seems to be the major cause
> 
> - the variable definition must be split across two lines

Thanks, should be fixed now on the emacs-26 branch.

Message #13 received at 32552-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: thomas.barabosch <at> fkie.fraunhofer.de
Cc: 32552-done <at> debbugs.gnu.org
Subject: Re: bug#32552: Core dump of Emacs 26.1 due to elisp variable
 definition
Date: Sat, 01 Sep 2018 17:01:23 +0300

> Date: Tue, 28 Aug 2018 10:22:12 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 32552 <at> debbugs.gnu.org
> 
> > From: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
> > Date: Tue, 28 Aug 2018 08:05:42 +0200
> > Cc: "Barabosch, Thomas" <thomas.barabosch <at> fkie.fraunhofer.de>
> > 
> > the following piece of elisp crashes Emacs 26.1 (core dump):
> > 
> > > ;;; -*- lexical-binding: t -*-
> > > (defvar ;dead-beef* (symbol-function #'dead-beef)
> > >     "Some random description")
> > 
> > Note a couple of things:
> > 
> > - lexical binding seems to be important (otherwise no crash)
> > 
> > - ; seems to be the major cause
> > 
> > - the variable definition must be split across two lines
> 
> Thanks, should be fixed now on the emacs-26 branch.

No further comments, so I'm closing this bug.

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