bug#18785: 24.4.1; Emacs hangs with Org mode when point is in LOGBOOK

[Eli Zaretskii <eliz@gnu.org>]

> From: Sebastien Vauban <sva-news@mygooglest.com>
> Cc: 18785@debbugs.gnu.org
> Date: Wed, 26 Nov 2014 14:11:31 +0100
> 
> Lisp Backtrace:
> "line-end-position" (0x88ccb0)
> "back-to-indentation" (0x88cdf8)
> "current-left-margin" (0x88cf60)
> "move-to-left-margin" (0x88d0b8)
> 0x126b2a8 PVEC_COMPILED
> "funcall" (0x88d220)
> "with-no-warnings" (0x88d36c)
> "setq" (0x88d41c)
> "if" (0x88d4ac)
> "let" (0x88d5cc)
> "ad-Advice-forward-paragraph" (0x88d7b0)
> "apply" (0x88d7ac)
> "forward-paragraph" (0x88d908)
> 0x126b380 PVEC_COMPILED
> "funcall" (0x88da60)
> "with-no-warnings" (0x88dbac)
> "setq" (0x88dc5c)
> "if" (0x88dcec)
> "let" (0x88de0c)
> "ad-Advice-backward-paragraph" (0x88dff0)
> "apply" (0x88dfec)
> "backward-paragraph" (0x88e15c)
> 0x67a1070 PVEC_COMPILED
> "funcall" (0x88e2d0)
> "syntax-ppss" (0x88e58c)
> "sp-get-quoted-string-bounds" (0x88e6e8)
> "sp--get-string-or-comment-bounds" (0x88e838)
> "sp-get-paired-expression" (0x88e9b8)
> "sp-get-expression" (0x88eb18)
> "sp-get-sexp" (0x88ec78)
> "sp-get-thing" (0x88edd8)
> 0x5b38338 PVEC_COMPILED
> "sp-show--pair-function" (0x88f14c)
> "apply" (0x88f148)
> "byte-code" (0x88f260)
> "timer-event-handler" (0x88f49c)
> (gdb)
> --8<---------------cut here---------------end--------------->8---
> 
> Does it help this time?

Maybe.  This backtrace looks very different from the last one.

What time fired here, and what function was it supposed to run?  And
how is that timer related to your LOGBOOK drawer?