From: Eli Zaretskii <eliz@gnu.org>
To: Michael Snyder <msnyder@specifix.com>
Cc: Stephen.Berman@gmx.net, gdb@sources.redhat.com
Subject: Re: GDB cannot access memory after Emacs abort
Date: Sun, 11 Nov 2007 07:44:00 -0000 [thread overview]
Message-ID: <ufxzdp6p4.fsf@gnu.org> (raw)
In-Reply-To: <1194763094.16917.278.camel@localhost.localdomain> (message from Michael Snyder on Sat, 10 Nov 2007 22:38:14 -0800)
> From: Michael Snyder <msnyder@specifix.com>
> Cc: gdb@sources.redhat.com
> Date: Sat, 10 Nov 2007 22:38:14 -0800
>
> Making sure that I understand -- you ran emacs under gdb,
> you set a breakpoint at abort, you hit the breakpoint --
The .gdbinit file in the Emacs src directory always sets a breakpoint
at `abort', because Emacs calls `abort' when it encounters a ``can't
happen'' situation.
> > > (gdb) xbacktrace
>
> OK, I'm not familiar with that command. "xbacktrace"?
It's defined in Emacs's src/.gdbinint. I reproduce it below, in case
you are interested, but the upshot of all this is that `bt' doesn't
work, as shown below:
> > > (gdb) bt
> > > #0 abort () at emacs.c:431
> > > Cannot access memory at address 0xbfd6836c
> > > Cannot access memory at address 0x8321b6c
Stack overflow, maybe?
define xbacktrace
set $bt = backtrace_list
while $bt
xgettype (*$bt->function)
if $type == Lisp_Symbol
xprintsym (*$bt->function)
printf " (0x%x)\n", *$bt->args
else
printf "0x%x ", *$bt->function
if $type == Lisp_Vectorlike
xgetptr (*$bt->function)
set $size = ((struct Lisp_Vector *) $ptr)->size
output ($size & PVEC_FLAG) ? (enum pvec_type) ($size & PVEC_TYPE_MASK) : $size & ~gdb_array_mark_flag
else
printf "Lisp type %d", $type
end
echo \n
end
set $bt = $bt->next
end
end
document xbacktrace
Print a backtrace of Lisp function calls from backtrace_list.
Set a breakpoint at Fsignal and call this to see from where
an error was signaled.
end
next prev parent reply other threads:[~2007-11-11 7:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87r6j6rvn3.fsf@escher.local.home>
2007-11-10 23:50 ` Stephen Berman
2007-11-11 6:46 ` Michael Snyder
2007-11-11 7:44 ` Eli Zaretskii [this message]
2007-11-11 23:05 ` Stephen Berman
2007-11-12 4:18 ` Eli Zaretskii
2007-11-12 5:24 ` Michael Snyder
2007-11-13 22:40 ` Stephen Berman
2007-11-13 23:20 ` Michael Snyder
2007-11-13 23:28 ` Dan Nicolaescu
2007-11-14 10:00 ` Stephen Berman
2007-11-13 23:57 ` Andreas Schwab
2007-11-11 19:22 ` Daniel Jacobowitz
2007-11-11 23:10 ` Stephen Berman
2007-11-12 0:39 ` Daniel Jacobowitz
2007-11-12 17:47 ` Jim Blandy
2007-11-12 19:44 ` Andreas Schwab
2007-11-13 22:36 ` Stephen Berman
2007-11-13 22:34 ` Stephen Berman
2007-11-13 23:14 ` Michael Snyder
2007-11-14 9:48 ` Stephen Berman
2007-11-13 23:51 ` Andreas Schwab
2007-11-12 7:39 ` Vladimir Prus
2007-11-13 22:36 ` Stephen Berman
2007-11-13 23:24 ` Michael Snyder
2007-11-14 9:50 ` Stephen Berman
2007-11-14 12:00 ` Michael Snyder
2007-11-14 19:24 ` Stephen Berman
2007-11-15 1:00 ` Michael Snyder
2007-11-11 23:01 ` Stephen Berman
2007-11-12 5:15 ` Michael Snyder
2007-11-14 9:55 ` Stephen Berman
2007-11-14 12:00 ` Michael Snyder
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