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[O] Bug: org-src-mode tries to cancel a nil idle timer [9.1.13 (release_

From: Andreas Fuchs
Subject: [O] Bug: org-src-mode tries to cancel a nil idle timer [9.1.13 (release_9.1.13-864-g5057e3 @ /Users/asf/.emacs.d/straight/build/org/)]
Date: Fri, 29 Jun 2018 01:36:37 +0200

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what in fact did happen.  You don't know how to make a good report?  See


Your bug report will be posted to the Org mailing list.

I use org-src-mode with org-src-auto-save-idle-delay (set to 1s), and
after upgrading org to the latest master version, it's repeatedly
causing me trouble: When I open an org-src-mode buffer and close it with
C-c ', I repeatedly get the message "Error running timer:
(wrong-type-argument timerp nil)". The backtrace is for a compiled
function, but after disassembling, it's pretty clear that it's the
routine in the lambda in org-src-mode that tries to cancel

Here are the steps that will do it for me, but I haven't been very lucky
reproducing this consistently:

(setq org-edit-src-auto-save-idle-delay 1
      org-edit-src-turn-on-auto-save nil)

1. Open an org file with elisp source code blocks
2. Use C-c ' on one of those blocks
3. Edit the buffer
4. Close the buffer after a while with C-c '

If it reproduces correctly, emacs shows the error above whenever it has
been idle for 1s.

The backtrace that I got is this:
Debugger entered--Lisp error: (wrong-type-argument timerp nil)
  signal(wrong-type-argument (timerp nil))
  #f(compiled-function () #<bytecode 0x410a61a5>)()
  apply(#f(compiled-function () #<bytecode 0x410a61a5>) nil)
  timer-event-handler([t 0 1 0 t #f(compiled-function () #<bytecode 0x410a61a5>) nil idle 0])

And here's the bottom of the disassembly for #<bytecode 0x410a61a5>:
42:4    discard  
43      dup      
44      not      
45      goto-if-nil-else-pop 5
48      constant  cancel-timer
49      varref    org-src--auto-save-timer
50      call      1
51      discard  
52      constant  nil
53      dup      
54      varset    org-src--auto-save-timer
55:5    stack-set 1
57      unbind    1
58      return    

I'm not sure how better to debug this, so please let me know if I can
provide more / better data. Thanks in advance!

Emacs  : GNU Emacs 26.1 (build 1, x86_64-apple-darwin13.4.0, Carbon Version 157 AppKit 1265.21)
 of 2018-04-15
Package: Org mode version 9.1.13 (release_9.1.13-864-g5057e3 @ /Users/asf/.emacs.d/straight/build/org/)
Andreas Fuchs, (http://|im:asf@|mailto:asf@)boinkor.net, antifuchs

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