bug#19181: 24.4; 24.4.1 libgcc_s_dw2-1.dll crash on exit

[Bill Farmer <williamjfarmer@yahoo.co.uk>]

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It does not seem to make any difference what file, I was using the 
grep-changelog file in the bin folder for testing, but any text or 
source file seems to cause the problem. I was visiting the file by 
dragging and dropping it into the emacs window. Visiting a file using 
the menu or 'C-x C-f' does not cause the problem. Starting emacs with 
emacs -Q crashes if a file is visited. I have attached a traceback from 
the zlib-available-p function. I couldn't paste it here because it 
contains null characters (^@).

Regards
Bill Farmer

On 26/11/2014 15:55, Eli Zaretskii wrote:
>> Date: Wed, 26 Nov 2014 11:34:52 +0000
>> From: Bill Farmer <williamjfarmer@yahoo.co.uk>
>> CC: dmoncayo@gmail.com, 19181@debbugs.gnu.org
>>
>> I have downloaded a built version of zlib1.dll from the zlib web site
>> (http://zlib.net) and copied the file into the bin folder of the emacs 24.4
>> distribution. This fixes the problem, as this version of zlib does not have a
>> dependency on libgcc_s_dw2-1.dll.
> Great, so your problem is solved.  I've now mentioned zlib1.dll in
> etc/PROBLEMS as the potential source of such crashes.
>
> However, I'd still like to understand why Emacs loads zlib1.dll when
> you visit a file.  Could you please help me figure that out?
>
> First, does that happen with any file, or just with a few particular
> ones, and if the latter, then which files trigger that?
>
> Second, how do you visit that file, exactly?  "C-x C-f", via the menu
> bar, something else?
>
> And finally, does Emacs load zlib1.dll if you invoke it as "emacs -Q"?
> If "emacs -Q" doesn't load zlib1.dll, can you try finding the
> customization in your ~/.emacs that causes this?
>
> There are only 2 functions in core Emacs that might load zlib:
> zlib-available-p and zlib-decompress-region.  So another way of
> finding out why zlib is being loaded is to "M-x debug-on-entry" both
> these functions, and when Emacs pops up the Lisp backtrace, see who
> called them.
>
> Thanks.


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Debugger entered--entering a function:
* zlib-available-p()
  byte-code("\300\301!\205\f\0\301 \205\f\0\302\207" [fboundp zlib-available-p "gzip"] 2)
  (defvar url-mime-encoding-string (byte-code "\300\301!\205\f\0\301 \205\f\0\302\207" [fboundp zlib-available-p "gzip"] 2) ("d:/Images/emacs/emacs-24.4/share/emacs/24.4/lisp/url/url-vars.elc" . 6787))
  require(url-vars)
  byte-code("\300\301!\210\300\302!\210\303\304\305\"\210\306\307\310\311#\210\306\312\313\314#\207" [require url-vars auth-source autoload url-scheme-get-property "url-methods" byte-code "\300\301\302\"\207" [defalias url-type--cmacro #[(_cl-whole-arg cl-x) "\301\302\303\304\211\211\b&\x06\207" [cl-x cl--defsubst-expand (cl-x) (cl-block url-type (or (and (memq ... cl-struct-url-tags)) (error "%s accessing a non-%s" (quote url-type) (quote url))) (aref cl-x 1)) nil] 7]] 3 "\300\301\302\303#\207" [put url-type compiler-macro url-type--cmacro] 4] 4)
  require(url-parse)
  byte-code("\300\301!\210\300\302!\210\303\304\305\"\210\303\306\305\"\210\303\307\310\"\207" [require url-parse url-vars autoload timezone-parse-date "timezone" timezone-make-date-arpa-standard mail-header-extract "mailheader"] 3)
  url-hexify-string("D:")
  mapconcat(url-hexify-string ("D:" "Images" "emacs" "emacs-24.4" "bin" "grep-changelog") "/")
  w32-handle-dropped-file(#<window 3 on *scratch*> "D:\\Images\\emacs\\emacs-24.4\\bin\\grep-changelog")
  apply(w32-handle-dropped-file #<window 3 on *scratch*> "D:\\Images\\emacs\\emacs-24.4\\bin\\grep-changelog")
  (closure (t) (&rest args) (apply (quote w32-handle-dropped-file) (quote #<window 3 on *scratch*>) args))("D:\\Images\\emacs\\emacs-24.4\\bin\\grep-changelog")
  mapc((closure (t) (&rest args) (apply (quote w32-handle-dropped-file) (quote #<window 3 on *scratch*>) args)) ("D:\\Images\\emacs\\emacs-24.4\\bin\\grep-changelog"))
  w32-drag-n-drop((drag-n-drop (#<window 3 on *scratch*> 192 (61 . 364) 10304786 nil 192 (6 . 4) nil (61 . 296) (9 . 17)) ("D:\\Images\\emacs\\emacs-24.4\\bin\\grep-changelog")))
  call-interactively(w32-drag-n-drop nil nil)
  command-execute(w32-drag-n-drop)