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Re: unicode-2 branch segfaulting on MacOS X?

From: Kenichi Handa
Subject: Re: unicode-2 branch segfaulting on MacOS X?
Date: Mon, 23 Oct 2006 11:45:04 +0900
User-agent: SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/22.0.50 (i686-pc-linux-gnu) MULE/5.0 (SAKAKI)

In article <address@hidden>, Geoffrey Alan Washburn <address@hidden> writes:

> > So, could you please use gdb to find exactly where (and how) Emacs causes 
> > segfault
> > (see etc/DEBUG if you are not familiar with gdb).

>       Could you be more specific about what you mean by "how" it is 
> segfaulting?  It is pretty obvious that it is reading/writing an invalid 
> memory location.  As I said the problem occurs in font_unparse_fcname. 
> In particular, line 1258 of font.c with parameters font=42759700, 
> pixel_size=19, name=0x2a20d20 "", and nbytes=96.

That's what I wanted to know.  The code around line 1258 is

1255  val = AREF (font, FONT_FOUNDRY_INDEX);
1256  if (! NILP (val))
1257    /* ":foundry=NAME" */
1258    len += 9 + SBYTES (SYMBOL_NAME (val));

So the variable `val' is suspicious.  Please check the type
and value of `val' as this:

(gdb) p val
(gdb) xtype
(gdb) pp val

Kenichi Handa

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