Hi Charles, Thanks for reporting this. This is bizarre. I reproduced it with my personal config, and with "emacs -q", but it only happens if org-inlinetask is loaded with "(require 'org-inlinetask)". This is with Emacs 25.1 and the Org package distributed with it for "emacs -q", and with Emacs 25.1 and Org 9.0.5 on my personal config.
I used "pkill -SIGUSR2 emacs" to interrupt the infinite loop and get a backtrace, but it took many tries of running that command in rapid succession, because each time, "Entering debugger..." would flash in the minibuffer for a moment before the process would go back into the infinite loop. After enough tries, it would stop the loop and show the backtrace, but it would go back into the loop as soon as I tried to switch windows or paste the backtrace into another program. I had to kill the process to make it stop. I'll paste below two backtraces I managed to get, but I'm afraid I don't know where to go from here. Since it only happens if org-inlinetask is loaded, I guess it's not a bug in org-sticky-header per se, but a bug that org-sticky-header exposes somehow. Aaron Jensen actually uncovered a bug in Emacs itself, and in org-sticky-header, a few days ago: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=26586 It was also an infinite loop. It seems unlikely to me that it's the same bug, but maybe they are related somehow. It's all I have to go on. If you are interested and adventurous enough, you could try building Emacs with the fix mentioned on that bug report, and see if you can still reproduce it. I can't be sure that it's actually a bug in Emacs, but since the infinite loop is practically impossible to break out of without killing the process, and since these backtraces don't mention anything related to org-anything, it seems like it should be reported as an Emacs bug. #+BEGIN_EXAMPLE Debugger entered--entering a function: * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * current-bidi-paragraph-direction() line-move-visual(1 nil) line-move(1 nil nil 1) next-line(1 1) funcall-interactively(next-line 1 1) call-interactively(next-line nil nil) command-execute(next-line) recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * tooltip-hide() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * tooltip-hide() #+END_EXAMPLE #+BEGIN_EXAMPLE Debugger entered--entering a function: * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() read-from-minibuffer("M-x " nil (keymap (10 . minibuffer-complete-and-exit) (13 . minibuffer-complete-and-exit) keymap (menu-bar keymap (minibuf "Minibuf" keymap (tab menu-item "Complete" minibuffer-complete :help "Complete as far as possible") (space menu-item "Complete Word" minibuffer-complete-word :help "Complete at most one word") (63 menu-item "List Completions" minibuffer-completion-help :help "Display all possible completions") "Minibuf")) (27 keymap (118 . switch-to-completions)) (prior . switch-to-completions) (63 . minibuffer-completion-help) (32 . minibuffer-complete-word) (9 . minibuffer-complete) keymap (menu-bar keymap (minibuf "Minibuf" keymap (previous menu-item "Previous History Item" previous-history-element :help "Put previous minibuffer history element in the minibuffer") (next menu-item "Next History Item" next-history-element :help "Put next minibuffer history element in the minibuffer") (isearch-backward menu-item "Isearch History Backward" isearch-backward :help "Incrementally search minibuffer history backward") (isearch-forward menu-item "Isearch History Forward" isearch-forward :help "Incrementally search minibuffer history forward") (return menu-item "Enter" exit-minibuffer :key-sequence "" :help "Terminate input and exit minibuffer") (quit menu-item "Quit" abort-recursive-edit :help "Abort input and exit minibuffer") "Minibuf")) (10 . exit-minibuffer) (13 . exit-minibuffer) (7 . abort-recursive-edit) (C-tab . file-cache-minibuffer-complete) (9 . self-insert-command) (XF86Back . previous-history-element) (up . previous-line-or-history-element) (prior . previous-history-element) (XF86Forward . next-history-element) (down . next-line-or-history-element) (next . next-history-element) (27 keymap (114 . previous-matching-history-element) (115 . next-matching-history-element) (112 . previous-history-element) (110 . next-history-element))) nil extended-command-history nil nil) completing-read-default("M-x " #[771 "\211\301>\203.\302\303\304\305\306\"\307\"\310\311%\202.\312.$\207" [obarray (nil t) make-byte-code 257 "\301!\205.\300\302!\232\206.\211\303N?\207" vconcat vector [symbol-name byte-obsolete-info] 4 "\n\n(fn SYM)" complete-with-action] 10 "\n\n(fn STRING PRED ACTION)"] commandp t nil extended-command-history nil nil) completing-read("M-x " #[771 "\211\301>\203.\302\303\304\305\306\"\307\"\310\311%\202.\312.$\207" [obarray (nil t) make-byte-code 257 "\301!\205.\300\302!\232\206.\211\303N?\207" vconcat vector [symbol-name byte-obsolete-info] 4 "\n\n(fn SYM)" complete-with-action] 10 "\n\n(fn STRING PRED ACTION)"] commandp t nil extended-command-history) read-extended-command() byte-code("\302 \303 E)\207" [execute-extended-command--last-typed current-prefix-arg nil read-extended-command] 3) call-interactively(execute-extended-command nil nil) command-execute(execute-extended-command) recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() message("") debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() message("Saved text until \"%s\"" "edit()\n debug(lambda)\n* tooltip-hide()\n") indicate-copied-region() kill-ring-save(1401 1 1) funcall-interactively(kill-ring-save 1401 1 1) call-interactively(kill-ring-save nil nil) command-execute(kill-ring-save) recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * current-bidi-paragraph-direction() line-move-visual(1 nil) line-move(1 nil nil 1) next-line(1 1) funcall-interactively(next-line 1 1) call-interactively(next-line nil nil) command-execute(next-line) recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * tooltip-hide() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * eval((if (display-graphic-p) " " "-")) redisplay_internal\ \(C\ function\)() recursive-edit() debug(lambda) * tooltip-hide() #+END_EXAMPLE
