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Date: Fri, 19 Aug 2005 11:38:51 +0300
Message-Id: <u1x4q2uec.fsf@gnu.org>
From: Eli Zaretskii <eliz AT gnu DOT org>
To: "emacs user" <emacs_user AT hotmail DOT com>
CC: jbuehler AT spirentcom DOT com, ehud AT unix DOT mvs DOT co DOT il, cygwin AT cygwin DOT com,
   emacs-devel AT gnu DOT org
In-reply-to: <BAY107-F46498362D7E00124227FFF8B20@phx.gbl> 	(emacs_user@hotmail.com)
Subject: Re: is there a cygwin maintainer for gnu emacs?
Reply-to: Eli Zaretskii <eliz AT gnu DOT org>
References:  <BAY107-F46498362D7E00124227FFF8B20 AT phx DOT gbl>

> From: "emacs user" <emacs_user AT hotmail DOT com>
> Date: Thu, 18 Aug 2005 02:45:21 -0400
> Cc: cygwin AT cygwin DOT com, emacs-devel AT gnu DOT org
> 
> some more diagnostics of the GC problem, with the help of some advice from 
> eliz.  does this help?

It's a beginning.  Thanks.

> Breakpoint 1, abort () at emacs.c:461
> 461	  kill (getpid (), SIGABRT);
> (gdb) where
> #0  abort () at emacs.c:461
> #1  0x200ed1c1 in mark_object (arg=536986871) at alloc.c:5468

The next step is to find out what object is the argument passed to
mark_object in frame #1.  This is the object that caused the abort.

Also, please send the output of the GDB command xbacktrace, it should
produce the Lisp traceback at this point (although it looks like Emacs
crashed right at startup, so the Lisp traceback will not tell anything
important).

> (gdb) print last_marked_index
> $6 = 22
> (gdb) print last_marked[22]
> $7 = 539791361

This is wrong.  etc/DEBUG says:

                                                            The variable
    `last_marked_index' holds the index into the `last_marked' array one
    place beyond where the pointer to the very last marked object is
    stored.

See that ``one place beyond'' part?  So you should have said

(gdb) print last_marked[21]

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