Bug: Having '%p" in frame-title-format makes org-mode to freeze [9.4 (release_9.4-134-g0d525c @ /home/massimo/bugreport/org-mode/lisp/)]

[Massimo Lauria]

Hi all,

I recently came across this weird issue using org-mode. Essentially
when I fold/unfold/fold some header in org-mode, pressing tab three
times,
I expect the section to fold again at the third keypress, and instead
emacs freezes. By detective work I discovered that it has to do with
having the '%p' option in
frame-title-format. The bug disappeared when I took "%p" option away
from frame-title-format.

Thank you for all you work and for any attention you will give to this
bug. I hope this message is useful.
I will now give enough info and data to reproduce the bug with a
minimal setup, and at the end of the message my emacs/org/Linux
configuration follows.

* Steps to reproduce the bug

Note that these steps only reproduce the bug when emacs runs
graphically. Using "emacs -nw" fails to reproduce the bug.

** Step 0. Prepare a folder ~/bugreport/  with the three files
"test.sh", "test.el" and "test.org" as follows

---- test.sh ---- downloads org-mode and runs emacs with the test setup
cd ~/bugreport/
git clone https://code.orgmode.org/bzg/org-mode.git
cd org-mode/
make autoloads

cd ~/bugreport/
emacs -Q -l test.el test.org &
-----------------------------------------


--- test.el ---- loads org-mode from the repository and set frame-title-format
(add-to-list 'load-path "~/bugreport/org-mode/lisp")
(setq frame-title-format '("%p"))
-----------------------------------------


---- test.org ---- just an org file with a header
* Try to hang emacs

  To  hang emacs  you should  fold/unfold/fold the  header of  this section
  a couple of times.
-----------------------------------------


** Step 1. Run the test
It is sufficient to go "cd ~/bugreport/" and do "sh ./test.sh"
You should see emacs starting and opening "test.org" file, and by
running 'org-version' you could double check that the appropriate
version of org has been loaded.

** Step 2. Make emacs freeze
Go to first line in the "test.org" file and press TAB three times.
Emacs should freeze now.


* Emacs/Org/Linux configuration

Here's some more details about my environment.

Emacs  : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.20, cairo version 1.16.0)
 of 2020-09-19
Package: Org mode version 9.4 (release_9.4-134-g0d525c @
/home/massimo/bugreport/org-mode/lisp/)
Linux: Linux nuc2020 5.4.0-53-generic #59-Ubuntu SMP Wed Oct 21
09:38:44 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Content of /etc/lsb-release:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"


current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
    org-src-mode-configure-edit-buffer)
 org-link-shell-confirm-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '((closure
 (org--rds reftex-docstruct-symbol
  org-element-greater-elements org-clock-history
  org-agenda-current-date org-with-time org-defdecode org-def
  org-read-date-inactive org-ans2 org-ans1
  org-columns-current-fmt-compiled org-clock-current-task
  org-clock-effort org-agenda-skip-function
  org-agenda-skip-comment-trees org-agenda-archives-mode
  org-end-time-was-given org-time-was-given
  org-log-note-extra org-log-note-purpose
  org-log-post-message org-last-inserted-timestamp
  org-last-changed-timestamp
  org-entry-property-inherited-from org-blocked-by-checkboxes
  org-state org-agenda-headline-snapshot-before-repeat
  org-agenda-start-on-weekday org-agenda-buffer-tmp-name
  org-priority-regexp org-mode-abbrev-table
  org-mode-syntax-table buffer-face-mode-face org-tbl-menu
  org-org-menu org-struct-menu org-entities org-last-state
  org-id-track-globally org-clock-start-time texmathp-why
  remember-data-file
  org-agenda-tags-todo-honor-ignore-options
  iswitchb-temp-buflist calc-embedded-open-mode
  calc-embedded-open-formula calc-embedded-close-formula
  align-mode-rules-list org-emphasis-alist
  org-emphasis-regexp-components
  org-export-registered-backends org-modules
  org-babel-load-languages org-id-overriding-file-name
  org-indent-indentation-per-level
  org-element-paragraph-separate ffap-url-regexp
  org-inlinetask-min-level t)
 nil
 (add-hook 'change-major-mode-hook 'org-show-all 'append
  'local)
 )
(closure
 (org-src-window-setup *this*
  org-babel-confirm-evaluate-answer-no
  org-babel-tangle-uncomment-comments
  org-src-preserve-indentation org-src-lang-modes
  org-edit-src-content-indentation org-babel-library-of-babel
  t)
 nil
 (add-hook 'change-major-mode-hook 'org-babel-show-result-all
  'append 'local)
 )
org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-bibtex-headline-format-function '(closure
      (org-id-locations
org-agenda-search-view-always-boolean
org-agenda-overriding-header t)
      (entry) (cdr (assq :title entry)))
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
     org-babel-header-arg-expand)
 org-agenda-loop-over-headlines-in-active-region nil
 org-occur-hook '(org-first-headline-recenter)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
 org-cycle-show-empty-lines
 org-optimize-window-after-visibility-change)
 org-speed-command-hook '(org-speed-command-activate
 org-babel-speed-command-activate)
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("attachment" :follow org-attach-follow :complete
org-attach-complete-link)
      ("id" :follow org-id-open)
      ("eww" :follow org-eww-open :store org-eww-store-link)
      ("rmail" :follow org-rmail-open :store
org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link)
      ("irc" :follow org-irc-visit :store org-irc-store-link
:export org-irc-export)
      ("info" :follow org-info-open :export org-info-export
:store org-info-store-link)
      ("gnus" :follow org-gnus-open :store
org-gnus-store-link)
      ("docview" :follow org-docview-open :export
org-docview-export :store org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store
org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export
:complete org-bbdb-complete-link :store
org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link) ("file+sys")
      ("file+emacs") ("shell" :follow org-link--open-shell)
      ("news" :follow
(closure
((scheme . "news") (--dolist-tail--) org-ts-regexp
 org-time-stamp-formats org-src-source-file-name
 org-outline-regexp-bol org-inhibit-startup
 org-id-link-to-org-use-id org-highlight-links
 org-comment-string org-agenda-buffer-name
 clean-buffer-list-kill-buffer-names t)
(url arg) (browse-url (concat scheme ":" url) arg))
)
      ("mailto" :follow
(closure
((scheme . "mailto") (--dolist-tail--) org-ts-regexp
 org-time-stamp-formats org-src-source-file-name
 org-outline-regexp-bol org-inhibit-startup
 org-id-link-to-org-use-id org-highlight-links
 org-comment-string org-agenda-buffer-name
 clean-buffer-list-kill-buffer-names t)
(url arg) (browse-url (concat scheme ":" url) arg))
)
      ("https" :follow
(closure
((scheme . "https") (--dolist-tail--) org-ts-regexp
 org-time-stamp-formats org-src-source-file-name
 org-outline-regexp-bol org-inhibit-startup
 org-id-link-to-org-use-id org-highlight-links
 org-comment-string org-agenda-buffer-name
 clean-buffer-list-kill-buffer-names t)
(url arg) (browse-url (concat scheme ":" url) arg))
)
      ("http" :follow
(closure
((scheme . "http") (--dolist-tail--) org-ts-regexp
 org-time-stamp-formats org-src-source-file-name
 org-outline-regexp-bol org-inhibit-startup
 org-id-link-to-org-use-id org-highlight-links
 org-comment-string org-agenda-buffer-name
 clean-buffer-list-kill-buffer-names t)
(url arg) (browse-url (concat scheme ":" url) arg))
)
      ("ftp" :follow
(closure
((scheme . "ftp") (--dolist-tail--) org-ts-regexp
 org-time-stamp-formats org-src-source-file-name
 org-outline-regexp-bol org-inhibit-startup
 org-id-link-to-org-use-id org-highlight-links
 org-comment-string org-agenda-buffer-name
 clean-buffer-list-kill-buffer-names t)
(url arg) (browse-url (concat scheme ":" url) arg))
)
      ("help" :follow org-link--open-help)
      ("file" :complete org-link-complete-file)
      ("elisp" :follow org-link--open-elisp)
      ("doi" :follow org-link--open-doi))
 org-link-elisp-confirm-function 'yes-or-no-p
 )

-- 
Massimo Lauria
http://www.massimolauria.net

Università degli studi di Roma - La Sapienza
Dipartimento di Scienze Statistiche
Piazzale Aldo Moro, 5
00185 Roma, Italy