bug#23158: 25.1.50; crash by consecutive http accesses

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 30 Mar 2016 15:20:09 +0900
> From: Katsumi Yamaoka <yamaoka@jpl.org>
> 
> (Recipe, bt full, and xbacktrace are below)
> 
> Hi,
> 
> I got a spam mail that crashes Emacs (at least the one built from
> the git master and 24.5 bundled with Cygwin).  The mail contains
> a lot of mail addresses in the From: header like this:
> 
> From: user<at>greenstream.in
> 	ly.com,abehera<at>jmi.ac.in,Alana<at>jmpco.com,ahron<at>jmpeacecorps.gov,kyu<at>jmtek.com,campfijf<at>jmu.edu,cnrrao<at>jncasr.ac.in,jeffv<at>jndtho
> 	mas.com,calpolyslofellow<at>jnf.org,edwin.rainbow<at>jnled.nl,a728399<at>jnxjn.com,cf<at>job114.cc,jroberts<at>jobeshenderson.com,salishnavaja
> 	...
> 
> When trying to read it using Gnus, Gnus tries to fetch gravatar
> image for each address, and those consecutive http accesses seem
> to crash Emacs.  Here is a simplified code for `emacs -Q' to
> reproduce the problem:
> 
> (progn
>   (require 'gnus-gravatar)
>   (require 'url)
>   (with-temp-buffer
>     (let ((url-cache-expire-time 0)
> 	  (gnus-article-buffer (current-buffer)))
>       (insert "From:")
>       (dotimes (i 255) (insert " foo@example.com.invalid,"))
>       (insert "\n")
>       (gnus-gravatar-transform-address "from" 'from-gravatar))))
> 
> `bt full' and xbacktrace are attached.  Thanks in advance.

Thanks.  Can you try reproducing the problem in an unoptimized build,
and show the backtrace from that?