all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Eli Zaretskii <eliz@gnu.org>
To: joakim@verona.se
Cc: 8472@debbugs.gnu.org
Subject: bug#8472: 24.0.50;  weird emacs bugs causing data lossage
Date: Mon, 11 Apr 2011 03:56:42 -0400	[thread overview]
Message-ID: <E1Q9BzG-00074o-MW@fencepost.gnu.org> (raw)
In-Reply-To: <m31v19gak4.fsf@verona.se> (joakim@chopper.i-did-not-set--mail-host-address--so-tickle-me)

> From: joakim@chopper.i-did-not-set--mail-host-address--so-tickle-me

 you-did-not-set--mail-host-address--so-i'm-tickling-you

> Date: Sun, 10 Apr 2011 21:39:55 +0200
> Cc: 
> 
> Emacs ask if I really want to edit the buffer and I say
> no. Then Emacs redisplay seems to hang.
> 
> This happened several times. Most times I had to kill emacs and loose
> my work. This time I tried more debugging. Lately I run Emacs in a
> debugger. Weirdly gdb refused to break itho a prompt. ctrl z and fg
> woke up gdb.

That might mean that Emacs was stuck in a system call.  But the fact
that it responded to emacsclient eliminates this possibility, I think.

I would try delivering a fatal signal to Emacs ("kill -TERM", for
example) from the shell prompt.  Detaching the debugger under which
you ran Emacs and attaching another instance of GDB is another thing
to try.

> it occured to me that maybe Emacs wasnt totaly hung maybe just
> redisplay.

I don't see how this can be true.  If redisplay infloops, it will
never return, and the rest of Emacs will never get to do anything,
including the calls to `select' that you saw in strace.

> So I tested emacs client and I could recover data like
> this:
> 
>  emacsclient -e "(let ((b (set-buffer \"journal.org\")) (text  (buffer-string))) (set-text-properties 0 (length text) nil text)text)"

Now I don't understand how come you couldn't break into it from GDB.

> There are two weird things here:
> - the file was truncated. Maybe this is due to a combination of
>   narrowing and automatic save.

Can't happen, auto-save forces temporary widening of the buffer (as
you'd expect ;-).

> - redisplay hangs in minibuffer input. I have no idea about why this
>   happens.

Doesn't seem to be the case, see above.

Best thing to try next time is somehow to stop Emacs, and then use the
procedure described in etc/DEBUG under "If the symptom of the bug is
that Emacs fails to respond".





  reply	other threads:[~2011-04-11  7:56 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-10 19:39 bug#8472: 24.0.50; weird emacs bugs causing data lossage joakim
2011-04-11  7:56 ` Eli Zaretskii [this message]
2011-04-11  9:25   ` joakim
2011-04-11  9:36     ` Eli Zaretskii

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=E1Q9BzG-00074o-MW@fencepost.gnu.org \
    --to=eliz@gnu.org \
    --cc=8472@debbugs.gnu.org \
    --cc=joakim@verona.se \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.