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[O] Emacs hangs while loading org file with python blocks
From: |
David Dynerman |
Subject: |
[O] Emacs hangs while loading org file with python blocks |
Date: |
Tue, 06 Dec 2016 17:41:57 -0800 |
Dear list,
For several months I've been encountering a frustrating bug. My emacs hangs
while initially loading an org file with ~3000 lines and around two dozen
python blocks. If I press C-g during the lockup, emacs wakes up and the file is
loaded. The hang does not re-occur after happening on initial load - the bug
will reoccur only if I restart emacs and load the file again. The hang seems to
be related to fontifying the python blocks: after I abort with C-g, some blocks
will be unfontified.
I previously emailed the list about this bug (Wed, 17 Aug 2016, subject 'Emacs
hangs while loading .org file'), but didn't have an easy way to reproduce the
problem.
I've now managed to extract a minimal org file that reproduces the hang:
#+BEGIN_SRC python
"""xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"""
#+END_SRC
#+BEGIN_SRC python
class x:
def x(self):
"""
"""
pass
#+END_SRC
To reproduce:
1) Save above as bug.org
2) Open a fresh emacs process, and C-x f bug.org <RET>
3) Observe emacs is unresponsive. I've let it run as long as 30 mins without
any change.
I am able to reproduce with emacs -Q, only executing the following in *scratch*:
(add-to-list 'load-path "/usr/local/share/emacs/site-lisp/org") ;; org from git
installed here
(require 'org)
This is with the latest org code from git (release_9.0-132-gd65aa3). The bug
does NOT occur with org 8.2.10. I've been encountering this bug for several
months, but unfortunately I don't remember exactly when I first saw it.
I'm running GNU Emacs 25.1.1 (x86_64-apple-darwin15.6.0, Carbon Version 157
AppKit 1404.47) of 2016-11-24.
I'm mystified as to what's going on here. It seems that removing any of the
python code in the example above causes the bug to disappear, but I have no
clue what the problem might be.
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%
It looks like emacs is getting stuck navigating the python blocks during
fontification. The last org-mode call appears to be (org-font-lock-ensure).
If anyone has any suggestions on how to fix this, I'd be very interested to
hearthem - I'm working with larger and larger org files containing python code,
so I'm encountering this bug frequently.
Thank you very much,
David
fontify-bug-profile
Description: Binary data
- [O] Emacs hangs while loading org file with python blocks,
David Dynerman <=