periodic timers getting wrong next time

[Joe Wells <jbw@macs.hw.ac.uk>]

I just noticed an instance where periodic timers were rescheduled with
the wrong time for their next invocation.

Here is the relevant value of timer-list:

  ([nil 18428 39853 313921 5 auto-revert-buffers nil nil]
   [nil 20359 56576 0 300 desktop-save-timer-function
        (periodic)
        nil]
   [nil 20359 57669 367306 3600 url-cookie-write-file nil nil])

You can see that the next-invocation times of the 2nd and 3rd timers
in the list are more than 4 years in the future.

The second timer is one that I start with this invocation of run-at-time:

  (run-at-time t 300 #'desktop-save-timer-function 'periodic)

It should not be possible for the timer running
desktop-save-timer-function to get a next-invocation time further than
5 minutes into the future.  Similarly, it should not be possible for
the timer running url-cookie-write-file to get a next-invocation time
further than 1 hour into the future.

No, I do not know how to reproduce this bug.

I hope this report is somehow helpful.

Joe Wells

======================================================================
In GNU Emacs 22.1.1 (i686-pc-linux-gnu, GTK+ Version 2.8.20)
 of 2007-06-27 on artemis
Windowing system distributor `The X.Org Foundation', version 11.0.70000000
configured using `configure  '--prefix=/home/jbw/local2' '--enable-debug' '--disable-nls' '--with-x-toolkit=gtk' 'CFLAGS=-O0 -g3 -ggdb''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
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  value of $LC_NUMERIC: nil
  value of $LC_TIME: jbw
  value of $LANG: nil
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  default-enable-multibyte-characters: t

Minor modes in effect:
  TeX-source-specials-mode: t
  shell-dirtrack-mode: t
  outline-minor-mode: t
  desktop-save-mode: t
  url-handler-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
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