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Re: SEGV in alloc.c on x86_64

From: Reiner Steib
Subject: Re: SEGV in alloc.c on x86_64
Date: Fri, 25 Feb 2005 16:37:05 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

On Mon, Feb 21 2005, Reiner Steib wrote:

> While using Gnus, Emacs received SIGSEGV.  See gdb backtrace and
> xbacktrace below.  The gdb session is still running so I can provide
> more information if necessary.
> In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 2.4.9)
>  of 2005-02-21 on bridgekeeper
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 182940272320 (LWP 27119)]
> Fcons (car=22960485, cdr=9613345)
>     at /home/dept/ste/src/links/emacs/cvs-HEAD/emacs/src/alloc.c:2680
> 2680          cons_free_list = *(struct Lisp_Cons **)&cons_free_list->cdr;
> (gdb) bt
> #0  Fcons (car=22960485, cdr=9613345)
>     at /home/dept/ste/src/links/emacs/cvs-HEAD/emacs/src/alloc.c:2680
> (gdb) xbacktrace 
> "mapcar"
> "easy-menu-create-menu"
> "byte-code"
> "recentf-update-menu"
> "run-hooks"
> (gdb) 
> --8<---------------cut here---------------end--------------->8---

It seems to me that this SEGV is similar to the one reported by 
Juri Linkov ("SIGSEGV on cons_free_list in alloc.c") today[1].

Here is some additional information from gdb (I'm not familiar with
debugging Emacs, so I just tried to enter the same commands Juri did):

--8<---------------cut here---------------start------------->8---
(gdb) p cons_free_list
$1 = (struct Lisp_Cons *) 0x2100000000006dbb
(gdb) p *cons_free_list
Cannot access memory at address 0x2100000000006dbb
(gdb) info local
val = 2377900603251649979
(gdb) p val
$2 = 2377900603251649979
(gdb) xtype 
(gdb) xsymbol 
$3 = (struct Lisp_Symbol *) 0x2100000000006db8
Cannot access memory at address 0x2100000000006dc0
(gdb) xstring 
Argument to arithmetic operation not a number or boolean.
--8<---------------cut here---------------end--------------->8---

Bye, Reiner.

[1] See http://thread.gmane.org/address@hidden
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/

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