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bug#24959: 26.0.50; cancel-timer: void-variable timer

From: Oleg Sivokon
Subject: bug#24959: 26.0.50; cancel-timer: void-variable timer
Date: Thu, 17 Nov 2016 11:48:11 +0200

I've built Emacs from master, commit 0588164.  Intermittently, I'm
facing this error:

Debugger entered--Lisp error: (void-variable timer)
  (cancel-timer timer)
  (condition-case err (if (let* ((--cl-var-- buffs) (buf nil) (--cl-flag-- t) 
--cl-var--) (while (and (consp --cl-var--) (progn (setq buf (car --cl-var--)) 
(setq --cl-flag-- (not ...)))) (setq --cl-var-- (cdr --cl-var--))) --cl-var--) 
nil (let* ((--cl-var-- buffs) (buf nil) (container nil) (contents nil)) (while 
(consp --cl-var--) (setq buf (car --cl-var--)) (setq container 
(save-current-buffer (set-buffer buf) container)) (setq contents 
(save-current-buffer (set-buffer buf) (buffer-substring (point-min) 
(point-max)))) (kill-buffer buf) (save-current-buffer (set-buffer output) 
(insert (format "\n\n===== %s =====\n\n" container)) (insert contents)) (setq 
--cl-var-- (cdr --cl-var--))) nil) (cancel-timer timer)) (error (let* 
((--cl-var-- buffs) (buf nil)) (while (consp --cl-var--) (setq buf (car 
--cl-var--)) (if (buffer-live-p buf) (progn (kill-buffer buf))) (setq 
--cl-var-- (cdr --cl-var--))) nil) (cancel-timer timer)))
  (lambda (output buffs) (condition-case err (if (let* ((--cl-var-- buffs) (buf 
nil) (--cl-flag-- t) --cl-var--) (while (and (consp --cl-var--) (progn (setq 
buf ...) (setq --cl-flag-- ...))) (setq --cl-var-- (cdr --cl-var--))) 
--cl-var--) nil (let* ((--cl-var-- buffs) (buf nil) (container nil) (contents 
nil)) (while (consp --cl-var--) (setq buf (car --cl-var--)) (setq container 
(save-current-buffer (set-buffer buf) container)) (setq contents 
(save-current-buffer (set-buffer buf) (buffer-substring ... ...))) (kill-buffer 
buf) (save-current-buffer (set-buffer output) (insert (format "\n\n===== %s 
=====\n\n" container)) (insert contents)) (setq --cl-var-- (cdr --cl-var--))) 
nil) (cancel-timer timer)) (error (let* ((--cl-var-- buffs) (buf nil)) (while 
(consp --cl-var--) (setq buf (car --cl-var--)) (if (buffer-live-p buf) (progn 
(kill-buffer buf))) (setq --cl-var-- (cdr --cl-var--))) nil) (cancel-timer 
timer))))(#<killed buffer> (#<killed buffer>))
  apply((lambda (output buffs) (condition-case err (if (let* ((--cl-var-- 
buffs) (buf nil) (--cl-flag-- t) --cl-var--) (while (and (consp --cl-var--) 
(progn (setq buf ...) (setq --cl-flag-- ...))) (setq --cl-var-- (cdr 
--cl-var--))) --cl-var--) nil (let* ((--cl-var-- buffs) (buf nil) (container 
nil) (contents nil)) (while (consp --cl-var--) (setq buf (car --cl-var--)) 
(setq container (save-current-buffer (set-buffer buf) container)) (setq 
contents (save-current-buffer (set-buffer buf) (buffer-substring ... ...))) 
(kill-buffer buf) (save-current-buffer (set-buffer output) (insert (format 
"\n\n===== %s =====\n\n" container)) (insert contents)) (setq --cl-var-- (cdr 
--cl-var--))) nil) (cancel-timer timer)) (error (let* ((--cl-var-- buffs) (buf 
nil)) (while (consp --cl-var--) (setq buf (car --cl-var--)) (if (buffer-live-p 
buf) (progn (kill-buffer buf))) (setq --cl-var-- (cdr --cl-var--))) nil) 
(cancel-timer timer)))) (#<killed buffer> (#<killed buffer>)))
  timer-event-handler([t 22573 31397 826685 1 (lambda (output buffs) 
(condition-case err (if (let* ((--cl-var-- buffs) (buf nil) (--cl-flag-- t) 
--cl-var--) (while (and (consp --cl-var--) (progn ... ...)) (setq --cl-var-- 
(cdr --cl-var--))) --cl-var--) nil (let* ((--cl-var-- buffs) (buf nil) 
(container nil) (contents nil)) (while (consp --cl-var--) (setq buf (car 
--cl-var--)) (setq container (save-current-buffer ... container)) (setq 
contents (save-current-buffer ... ...)) (kill-buffer buf) (save-current-buffer 
(set-buffer output) (insert ...) (insert contents)) (setq --cl-var-- (cdr 
--cl-var--))) nil) (cancel-timer timer)) (error (let* ((--cl-var-- buffs) (buf 
nil)) (while (consp --cl-var--) (setq buf (car --cl-var--)) (if (buffer-live-p 
buf) (progn ...)) (setq --cl-var-- (cdr --cl-var--))) nil) (cancel-timer 
timer)))) (#<killed buffer> (#<killed buffer>)) nil 773000])
  read-event(nil t 2)
  execute-extended-command(nil "toggle-debug-on-error" "toggle-debug-on-er")
  funcall-interactively(execute-extended-command nil "toggle-debug-on-error" 
  call-interactively(execute-extended-command nil nil)

Unfortunately, I don't know how to find the source, but I'm afraid that
there may be a problem with Lisp interpreter (there is no way `timer' is
unbound in `cancel-timer' because it's its argument).

This problem doesn't exist in Emacs 24.5.1

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-11-12 built on localhost.localdomain
Repository revision: 058816441840b5229b4437ff486a243e05fc5c93
Windowing system distributor 'Fedora Project', version 11.0.11803000
System Description:     Fedora release 23 (Twenty Three)

Recent messages:
mouse-2, RET: find function's definition
uncompressing simple.el.gz...done
Mark saved where search started
uncompressing subr.el.gz...done
Mark saved where search started
mouse-2, RET: find function's definition [2 times]
mouse-2, RET: find function's definition
uncompressing timer.el.gz...done
Making completion list...

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