Subject: 26.0.50; emacs hangs when loading org file with python source blocks

From: David Dynerman <[email-masked]>
Date: Wed, 07 Dec 2016 10:33:11 -0800

Emacs hangs when first opening an org file that contains a python source block. This only occurs the first time the file is visited - if I abort I no longer experience hangs when visiting any org files containing python source blocks. This bug has also been reported to emacs-orgmode (6 Dec 2016, Subject: Emacs hangs while loading org file with python blocks), but the suggestion was to report it upstream to bug-gnu-emacs.

Here is a minimal example of org code (in between <------> markers) to reproduce the hang:

<------->
#+BEGIN_SRC python
  """xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"""
#+END_SRC
#+BEGIN_SRC python
  class x:  
      def x(self):
          """
	  """
          pass
#+END_SRC
<------->

To reproduce:

1) Save the above as python-hang.org
2) Start a new emacs process
3) C-x C-f python-hang.org RET
4) Observe emacs hangs. I have waited up to 30 mins to see if the file loads, without success. Typing C-g unhangs emacs and displays the file.

Other information:

The bug seems related to fontification - during the hang emacs seems stuck in python fontification code. After aborting the load with C-g, occasionally some python blocks will not be correctly fontified. I have attached a profiler report taken during the hang, showing where emacs is stuck. The relevant part of the call stack:

I've attached a profiler report captured during the hang. Here is the relevant part:

	   - org-src-font-lock-fontify-block                    17419  46%
	    - org-font-lock-ensure                              17240  45%
	     - #<compiled 0x41086c73>                           17240  45%
	      - font-lock-default-fontify-buffer                17240  45%
	       - font-lock-fontify-region                       17240  45%
		- font-lock-default-fontify-region              17240  45%
		 - font-lock-fontify-syntactically-region              17240  45%
		  - python-font-lock-syntactic-face-function              17240  45%
		   - python-info-docstring-p                    17240  45%
		    - python-nav-backward-sexp                  17240  45%
		     - python-nav-forward-sexp                  17240  45%
		      - python-nav--forward-sexp                17240  45%
		       - python-info-end-of-block-p              17240  45%
			- python-info-end-of-statement-p              17240  45%
			 - python-nav-end-of-statement              15444  41%
			    syntax-ppss                          8641  22%

I _AM_ able to reproduce this hang in emacs -Q, executing only the following in *scratch*, and then running the reproduction steps above.

(add-to-list 'load-path "/usr/local/share/emacs/site-lisp/org") ;; org from git installed here
(require 'org)

I am using the latest org code from git (release_9.0-132-gd65aa3).

The bug does NOT occur with org 8.2.10.

In addition to experiencing this hang in emacs 26.0.50.1 (where this bug report is generated) I also ran into the bug on Emacs 25.1.1 (x86_64-apple-darwin15.6.0, Carbon Version 157 AppKit 1404.47) of 2016-11-24.

In GNU Emacs 26.0.50.1 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 10.11.6 (Build 15G1108))
 of 2016-12-07 built on CIVIC-TV.local
Repository revision: f41097adf3e7155f9c0db6d90de0aa1623d89232
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
Created acrlong link.
Created acrfull link.
Created ac link.
Created Ac link.
Created acp link.
Created Acp link.
Created latex link.
Loading /Users/dynerman/personal/dev/emacs/emacs.el (source)...done
Loaded ~/personal/dev/emacs/emacs.el
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs/HEAD-f41097a/share/info/emacs
 --prefix=/usr/local/Cellar/emacs/HEAD-f41097a --without-x --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-rsvg --with-ns
 --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
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  helm-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
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  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

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mail-extr emacsbug sendmail winner helm-command helm-elisp helm-eval
edebug solarized-light-theme solarized color multi-term term disp-table
ehelp org-notmuch ob-ditaa ob-shell ob-C cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs ob-ledger
ob-ipython python tramp-sh dash-functional ob-python org-ref
org-ref-helm-bibtex org-ref-helm helm-bibtex bibtex-completion biblio
biblio-download biblio-dissemin biblio-hal biblio-dblp biblio-crossref
biblio-arxiv timezone biblio-doi biblio-core let-alist url-queue ido
org-ref-core reftex-cite reftex reftex-loaddefs reftex-vars parsebib
org-ref-glossary org-ref-utils org-ref-pdf org-ref-bibtex
org-ref-citeproc hydra lv doi-utils url-http url-auth url-gw nsm
org-bibtex json map bibtex f s dash ox-reveal ox-odt rng-loc rng-uri
rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii
ox-publish ox jabber jabber-notifications notifications jabber-libnotify
dbus jabber-awesome jabber-osd jabber-wmii jabber-xmessage
jabber-festival jabber-sawfish jabber-ratpoison jabber-tmux
jabber-screen jabber-socks5 jabber-ft-server jabber-si-server
jabber-ft-client jabber-ft-common jabber-si-client jabber-si-common
jabber-feature-neg jabber-truncate jabber-time jabber-autoaway
jabber-vcard-avatars jabber-chatstates jabber-events jabber-vcard
jabber-avatar jabber-activity jabber-watch jabber-modeline
jabber-ahc-presence jabber-ahc jabber-version jabber-ourversion
jabber-muc-nick-completion hippie-exp jabber-browse jabber-search
jabber-register jabber-roster jabber-presence jabber-muc
jabber-bookmarks jabber-private jabber-muc-nick-coloring hexrgb
jabber-widget jabber-disco jabber-chat jabber-history jabber-chatbuffer
jabber-alert jabber-iq jabber-core jabber-console sgml-mode dom ewoc
jabber-keymap jabber-sasl sasl sasl-anonymous sasl-login sasl-plain fsm
jabber-logon jabber-conn srv dns starttls tls gnutls jabber-xml
jabber-menu jabber-util company offlineimap mailq notmuch hl-line
notmuch-message notmuch-hello wid-edit notmuch-tree notmuch-show
notmuch-print notmuch-crypto notmuch-mua notmuch-draft
notmuch-maildir-fcc notmuch-address notmuch-company notmuch-parser
notmuch-wash diff-mode coolj notmuch-query goto-addr icalendar diary-lib
diary-loaddefs notmuch-tag crm notmuch-lib notmuch-version
notmuch-compat message subr-x puny rfc822 mml mailabbrev gmm-utils
mailheader mm-view mml-smime mml-sec epa derived epg gnus-util rmail
rmail-loaddefs mail-utils smime dig mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr
helm-mode helm-files rx image-dired dired-x dired-aux ffap thingatpt
helm-buffers helm-elscreen helm-tags helm-bookmark helm-adaptive
helm-info bookmark pp helm-locate helm-grep helm-regexp helm-external
helm-net browse-url xml url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap helm-utils compile
helm-help helm-types helm helm-source eieio-compat helm-multi-match
helm-lib dired dired-loaddefs helm-config helm-easymenu async-bytecomp
async bash-completion edmacro kmacro theme-changer solar cal-dst cl
exec-path-from-shell org-element avl-tree org org-macro org-footnote
org-pcomplete org-list org-faces org-entities noutline outline
easy-mmode org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob
ob-table ob-keys ob-exp ob-comint tramp tramp-compat tramp-loaddefs
trampver shell pcomplete parse-time advice comint ansi-color ring
ob-core ob-eval org-compat org-macs org-loaddefs format-spec find-func
cal-menu calendar cal-loaddefs finder-inf tex-site info package
epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp
byte-compile cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/ns-win ns-win ucs-normalize term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote kqueue cocoa ns
multi-tty make-network-process emacs)

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