Subject: bug#29269: closed (Re: 27.0.50; assertion failed: XTYPE (a) == type && XUNTAG (a, type) == ptr)

From: [email-masked] (GNU bug Tracking System)
Date: Mon, 13 Nov 2017 20:35:02 +0000

Your bug report

#29269: 27.0.50; assertion failed: XTYPE (a) == type && XUNTAG (a, type) == ptr

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
29269: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29269
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: 27.0.50; assertion failed: XTYPE (a) == type && XUNTAG (a, type) == ptr
From: Stefan Monnier <[email-masked]>
To: Paul Eggert <[email-masked]>
Cc: [email-masked]
Date: Mon, 13 Nov 2017 15:34:22 -0500
List-Id: <debbugs-submit.debbugs.gnu.org>

> I installed some alignment-related patches into emacs-26 and just now merged
> them into master. They are supposed fix the Lisp_Subr alignment
> problem. Please give them a try.

Works for me, thanks,

        Stefan

Subject: 27.0.50; assertion failed: XTYPE (a) == type && XUNTAG (a, type) == ptr
From: Stefan Monnier <[email-masked]>
To: [email-masked]
Date: Sat, 11 Nov 2017 20:19:38 -0500
List-Id: <debbugs-submit.debbugs.gnu.org>

Package: Emacs
Version: 27.0.50

The recent changes w.r.t alignment seem to have introduced a regression
on my 32bit system:

    [...]
    ./temacs --batch  --load loadup bootstrap
    
    lisp.h:1068: Emacs fatal error: assertion failed: XTYPE (a) == type && XUNTAG (a, type) == ptr

The corresponding backtrace looks like:

    (gdb) bt
    #0  0x08196f56 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647)
        at emacs.c:363
    #1  0x0821873e in die (msg=0x831ec24 "XTYPE (a) == type && XUNTAG (a, type) == ptr", file=0x831e36d "lisp.h", line=1068) at alloc.c:7431
    #2  0x0828102b in make_lisp_ptr (type=
        Lisp_Vectorlike, ptr=0x844328c <Sinternal_make_lisp_face>) at lisp.h:1068
    #3  0x0828102b in defsubr (sname=0x844328c <Sinternal_make_lisp_face>)
        at lread.c:4354
    #4  0x0814c4f0 in syms_of_xfaces () at xfaces.c:6460
    #5  0x08197c29 in main (argc=<optimized out>, argv=<optimized out>)
        at emacs.c:1220
    (gdb) 

So it looks like we're missing an alignment constraint on the Lisp_Subr
objects.

        Stefan

In GNU Emacs 27.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.22.24)
 of 2017-11-05 built on alfajor
Repository revision: 7b20a85bf651debb66742d7ed8a55bdc883ded79
Windowing system distributor 'The X.Org Foundation', version 11.0.11905000
System Description:	Debian GNU/Linux testing (buster)

Recent messages:
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Entering debugger...
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Command: set annotate 1
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Mark set
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