Subject: bug#23158: 25.1.50; crash by consecutive http accesses

From: Lars Magne Ingebrigtsen <[email-masked]>
Date: Wed, 30 Mar 2016 17:43:55 +0200

Katsumi Yamaoka <[email-masked]> writes:

> 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 " [email-masked],"))
>       (insert "\n")
>       (gnus-gravatar-transform-address "from" 'from-gravatar))))

Hm...  this doesn't crash Emacs on this Linux machine, at least.

> #0  0x00475e27 in setup_coding_system (coding_system=2025368, coding=0xffffffff) at coding.c:5706
>         eol_type = <optimized out>
> #1  0x005734fa in setup_process_coding_systems (process=process@entry=1659289077) at process.c:7507
>         inch = 64
>         outch = 64
>         coding_system = <optimized out>
> #2  0x00577705 in Fmake_network_process (ip_addresses=<optimized out>, proc=1659289077) at process.c:3375
>         family = 2

This is happening in the code paths that were refactored during the
async network rewrite, but this seems to be called pretty
straightforwardly here (not in a callback from the DNS code).  (Which
makes sense, since Windows doesn't have getaddrinfo_a...)

Hm...  coding=0xffffffff looks pretty suspicious, but it's difficult to
tell with an optimised build.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no