From: Reuben Thomas <rrt@sc3d.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 24640@debbugs.gnu.org
Subject: bug#24640: Crashes in 25.1
Date: Tue, 11 Oct 2016 15:08:45 +0100 [thread overview]
Message-ID: <CAOnWdohc8gOBHLCAaoSHUdY52ouQjWm1nVAoi1-J7=JFDRf2ew@mail.gmail.com> (raw)
In-Reply-To: <83lgxvcd10.fsf@gnu.org>
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On 11 October 2016 at 12:59, Eli Zaretskii <eliz@gnu.org> wrote:
> Thanks, I've done some initial debugging. The crash seems to be
> related to the variable read_objects, defined and used by lread.c. It
> is an alist of objects read with the #n=object form. One of its
> members is a corrupted Lisp object, which causes the GC crash when
> this object is examined.
>
Good stuff!
> read_objects is a global variable, so it could be that some code
> invoked in the middle of reading one #n=object form clobbers it by
> reading another. However, I don't immediately see such forms in the
> few of your many init files I looked in.
Indeed, I'm not aware of having used such a form myself, nor can I find one
by grepping.
> Do you have any idea where
>
> this could come from?
No, sorry.
> One place they are abundant is in *.elc files,
> so maybe some recursive load together with the timer-based lazy
> desktop operation does that? I don't really have a working hypothesis
> for now.
>
Could it be loading the undo-tree undo history? The crash always seems to
happen when loading mit.tex. It tries to load the undo-tree history, fails
(because the file has been changed since the history was last saved), then
crashes. The undo-tree history is full of #n=object forms.
I can let you have the undo-tree history file if that might help you
identify the corrupted data.
> I'm not an expert on X tricks -- is there any way you can trick Emacs
> to start a GUI session when I invoke it via SSH? Some trick with the
> value of DISPLAY in the environment, perhaps? I don't need to see
> what Emacs displays, just run it live under GDB. The problem that
> causes the crash happens before the code I see in the backtrace --
> that code just triggers GC. So it would be beneficial to run Emacs
> under GDB and try to see, for example, what code changes read_objects
> and how (assuming it is not changed to a non-nil value too many
> times). Can this be arranged?
>
If you use "ssh -X", you can get an X connection and Emacs will start a
GUI session. That's the simplest thing I can think of; not really a trick
at all.
--
http://rrt.sc3d.org
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next prev parent reply other threads:[~2016-10-11 14:08 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-07 23:12 bug#24640: Crashes in 25.1 Reuben Thomas
2016-10-08 5:53 ` Eli Zaretskii
2016-10-08 13:28 ` Reuben Thomas
2016-10-08 13:30 ` Reuben Thomas
2016-10-08 14:30 ` Eli Zaretskii
2016-10-08 15:26 ` Reuben Thomas
2016-10-08 15:34 ` Eli Zaretskii
2016-10-08 22:08 ` Reuben Thomas
2016-10-09 7:05 ` Eli Zaretskii
2016-10-09 7:45 ` Reuben Thomas
2016-10-09 9:57 ` Eli Zaretskii
2016-10-09 20:21 ` Reuben Thomas
2016-10-10 6:15 ` Eli Zaretskii
2016-10-10 16:12 ` Reuben Thomas
2016-10-10 16:33 ` Eli Zaretskii
2016-10-10 17:01 ` Reuben Thomas
2016-10-10 17:05 ` Eli Zaretskii
2016-10-10 17:06 ` Reuben Thomas
[not found] ` <CAOnWdoheXTvdasXN8vQFZPyayZVHD-QweqJupVrS8BQFxj2iGw@mail.gmail.com>
[not found] ` <831szodsus.fsf@gnu.org>
[not found] ` <CAOnWdojJHhajbRcinnubLfwWhY=snydnPM7Cws9ktX+pJe8aGA@mail.gmail.com>
[not found] ` <83zimccbzr.fsf@gnu.org>
[not found] ` <CAOnWdojzYsTR=wyrn-k2dJbStej89neskr=vwZQQWrQVCGtpkA@mail.gmail.com>
2016-10-11 11:59 ` Eli Zaretskii
2016-10-11 14:08 ` Reuben Thomas [this message]
2016-10-11 14:53 ` Eli Zaretskii
2016-10-11 15:19 ` Eli Zaretskii
2016-10-11 15:42 ` Reuben Thomas
2016-10-11 16:26 ` Eli Zaretskii
2016-10-11 15:41 ` Reuben Thomas
2016-10-11 16:33 ` Eli Zaretskii
2016-10-11 16:41 ` Reuben Thomas
2016-10-12 10:31 ` Eli Zaretskii
2016-10-12 10:57 ` Reuben Thomas
2016-10-12 11:14 ` Eli Zaretskii
2016-10-12 13:50 ` Toby Cubitt
2016-10-12 14:44 ` Eli Zaretskii
2016-10-12 16:56 ` Toby Cubitt
2016-10-12 17:28 ` Eli Zaretskii
2016-10-12 18:07 ` Toby Cubitt
2016-10-12 19:15 ` Eli Zaretskii
2016-10-12 20:45 ` Reuben Thomas
2016-10-14 20:06 ` Eli Zaretskii
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