bug#30182: Update

[Eli Zaretskii]

> Date: Sat, 20 Jan 2018 15:12:35 +0100
> From: martin rudalics <rudalics@gmx.at>
> Cc: 30182@debbugs.gnu.org
> 
>  >> Just to eliminate one possible cause: Does the bug disappear when you
>  >> customize `mode-line-default-help-echo' to the default value of the
>  >> 'string' alternative?
>  >
>  > Yes, if that is done, then the crash doesn't happen.
> 
> I'm completely lost here.  The behavior eludes my most vivid
> imagination.  Why on earth should `copy-sequence' choke on
> `timer-list'?

Is it possible that the crash was actually in another thread?
Although 'Thread 1 "emacs" received signal SIGSEGV' seems to rule that
out...  But still, it could be useful to see the output of the GDB
command "thread apply all bt full".

Also, could the OP please rebuild Emacs without optimizations and show
the backtrace from that build?