From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Harald Maier <harald@maierh.de>
Cc: 2403@emacsbugs.donarmstrong.com
Subject: bug#2403: 23.0.90; emacs bootstrap under AIX hangs at lisp/international/characters.el
Date: Thu, 26 Feb 2009 15:47:41 -0500 [thread overview]
Message-ID: <jwv1vtlc4p3.fsf-monnier+emacsbugreports@gnu.org> (raw)
In-Reply-To: <m2ab89njgn.fsf@ate.maierh> (Harald Maier's message of "Thu, 26 Feb 2009 19:26:00 +0100")
> I digged a little bit deeper to this problem. temacs is in an endless
> loop in the following for loop in the alloca.c file:
> --- alloca.c:5101 ---
> #if (GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS \
> || GC_MARK_STACK == GC_MARK_STACK_CHECK_GCPROS)
> mark_stack ();
> #else
> {
> register struct gcpro *tail;
> => for (tail = gcprolist; tail; tail = tail->next)
> for (i = 0; i < tail->nvars; i++)
> mark_object (tail->var[i]);
> }
> #endif
> ---------------------
> If I examine the values in gdb then I see that the second element of
> gcprolist points to itself in the next element. That's why emacs loops.
> Any idea how to fix that?
No idea. This should never happen, obviously. The gcprolist (and its
elements) should only ever be touched by the macros GCPRO<n> and
UNGCPRO, so the only thing that comes to mind is that someone does
GCPRO1 twice in the same block.
You may want to add some
eassert(gcprolist != &gcpro<n>);
to the GCPRO macros which may catch the bug. Alternatively, if you look
at the backtrace, the problematic uses of GCPRO<n> should be nearby.
Of course, maybe the problem really is one of the stack being clobbered.
Stefan
prev parent reply other threads:[~2009-02-26 20:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-20 5:00 bug#2403: 23.0.90; emacs bootstrap under AIX hangs at lisp/international/characters.el Harald Maier
2009-02-26 18:26 ` Harald Maier
2009-02-26 18:28 ` Harald Maier
2009-02-26 19:35 ` Eli Zaretskii
2009-02-26 20:02 ` Harald Maier
2009-02-27 10:27 ` Eli Zaretskii
2009-03-06 21:19 ` Criveti Mihai
2009-03-06 23:04 ` Criveti Mihai
2009-03-07 1:34 ` Dan Nicolaescu
2009-03-07 4:39 ` Dan Nicolaescu
2009-03-08 14:20 ` Harald Maier
2009-03-08 19:11 ` Eli Zaretskii
2009-03-09 18:02 ` Dan Nicolaescu
2009-03-10 6:18 ` Criveti Mihai
2009-03-10 19:48 ` Eli Zaretskii
2009-03-11 5:32 ` Harald Maier
2009-02-26 20:47 ` Stefan Monnier [this message]
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