bug#30182: Update

[Eli Zaretskii]

> Date: Wed, 31 Jan 2018 10:31:38 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: m.sujith@gmail.com, 30182@debbugs.gnu.org
> 
>  > How about running the code with a watchpoint on Vtimer_alist?  Could
>  > that help?
> 
> That hardly sounds like an amusing experience with all those timers
> around.

They can all be canceled, and the watchpoint could have "commands"
that let it continue, to avoid disrupting normal operation.