GNU bug report logs - #12743
24.2.50; run-python hangs

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 17:47:17 +0200

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Immediately after starting Emacs with `emacs -Q` I ran
M-x run-python
This enters an infinite loop. I can interrupt the infinite loop with
C-g. After loop was interrupted, I looked into *Messages* buffer.
This is its contents:

Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Error during redisplay: (jit-lock-function 1) signaled (quit)

After the fucntion was interrupted, the *Python* buffer appeared.
The modeline in the buffer spells: (Inferior Python:run
Shell-Compile)
I'm not sure if that is how it should be. I experience similar issues
with JavaScript-2 mode when using commint buffer to M-x run-js
Some times Emacs would lock up and after interruping it with C-g it
would print a message connected to a problem with displaying a face.
Sorry, I can't provide more info at the moment, but if that is
related, will find a way to do it.

Best.

Oleg

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/local/share/emacs/24.2.50/etc/DEBUG.


In GNU Emacs 24.2.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.11)
 of 2012-10-14 on wvxvw-desktop
Bzr revision: 110539 rgm <at> gnu.org-20121014001707-nd6ld4b0oxhsyl2c
Windowing system distributor `Fedora Project', version 11.0.11203000
System Description:	Fedora release 17 (Beefy Miracle)

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r u n - p y t h <tab> <return> C-x o C-x b <return>
M-x r e p o r t - b <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Error during redisplay: (jit-lock-function 1) signaled (quit)

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
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mail-prsvr mail-utils compile python rx easymenu comint ring ansi-color
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
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dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 17:57:39 +0200

Hello again,

I think I know what the problem is, but I don't know how to fix it:

(defun jit-lock-function (start)
  "Fontify current buffer starting at position START.
This function is added to `fontification-functions' when `jit-lock-mode'
is active."
  (when (and jit-lock-mode (not memory-full))
    (if (null jit-lock-defer-timer)
        ;; No deferral.
        (jit-lock-fontify-now start (+ start jit-lock-chunk-size))
      ;; Record the buffer for later fontification.
      (unless (memq (current-buffer) jit-lock-defer-buffers)
        (push (current-buffer) jit-lock-defer-buffers))
      ;; Mark the area as defer-fontified so that the redisplay engine
      ;; is happy and so that the idle timer can find the places to fontify.
      (with-buffer-prepared-for-jit-lock
       (put-text-property start
                          (next-single-property-change
                           start 'fontified nil
                           (min (point-max) (+ start jit-lock-chunk-size)))
                          'fontified 'defer)))))

There are 3 s-expressions inside (if ...), the third will never run,
but it probably has to. Maybe it should be (when ...) instead of (if
...)?

Best.

Oleg

Message #11 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Left Right <olegsivokon <at> gmail.com>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 18:04:26 +0200

Left Right <olegsivokon <at> gmail.com> writes:

> There are 3 s-expressions inside (if ...), the third will never run,
> but it probably has to. Maybe it should be (when ...) instead of (if
> ...)?

(if COND THEN ELSE...)

If COND yields non-nil, do THEN, else do ELSE...
Returns the value of THEN or the value of the last of the ELSE's.
THEN must be one expression, but ELSE... can be zero or more expressions.
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #14 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 18:10:12 +0200

OK, I admit, I wasn't clear, I didn't count the first one, so 4
s-expressions, not 3.

Best.

Oleg

Message #17 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 18:17:48 +0200

Ohhh... I think I know what's the reason:

with-buffer-prepared-for-jit-lock'
<-------------------------------------- note the quote! the name of
the macro doesn't have the quote in it, so instead of expanding the
macro, it thinks it is an undefined function. Doesn't it?

Best.

Oleg

Message #20 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 18:31:19 +0200

Sorry for the noise. That was some artefact left after me trying to debug.

Best.

Oleg

Message #23 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Left Right <olegsivokon <at> gmail.com>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 18:49:28 +0200

> Date: Sat, 27 Oct 2012 17:47:17 +0200
> From: Left Right <olegsivokon <at> gmail.com>
> 
> Immediately after starting Emacs with `emacs -Q` I ran
> M-x run-python
> This enters an infinite loop. I can interrupt the infinite loop with
> C-g. After loop was interrupted, I looked into *Messages* buffer.
> This is its contents:
> 
> Sent python-shell-completion-setup-code
> Sent python-ffap-setup-code
> Sent python-eldoc-setup-code
> Error during redisplay: (jit-lock-function 1) signaled (quit)

This is a duplicate of bug #12645.

Message #26 received at 12743 <at> debbugs.gnu.org (full text, mbox):

From: Left Right <olegsivokon <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 12743 <at> debbugs.gnu.org
Subject: Re: bug#12743: 24.2.50; run-python hangs
Date: Sat, 27 Oct 2012 19:06:58 +0200

Oops, sorry, had to search it before.

Best.

Oleg

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