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

[Oleg Sivokon <oleg.sivokon@elastifile.com>]

Hello,
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)
  sit-for(2)
  execute-extended-command(nil "toggle-debug-on-error" "toggle-debug-on-er")
  funcall-interactively(execute-extended-command nil "toggle-debug-on-error" "toggle-debug-on-er")
  call-interactively(execute-extended-command nil nil)
  command-execute(execute-extended-command)

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 26.0.50.1 (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]
Quit
mouse-2, RET: find function's definition
uncompressing timer.el.gz...done
Making completion list...

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