bug#15905: 24.3; url-copy-file sometimes silently downloads garbage or incomplete file

[Ryan]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org. Please check that
the From: line contains a valid email address. After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug. If you can, give a recipe
starting from `emacs -Q':

Here is a link to code to reproduce the bug: 
https://www.dropbox.com/s/lpkdnfb3f9m3ge3/emacs-url-download-bug.el

This code downloads the same problematic file 50 times and tests the 
result each time. The "result" variable is set to a list of the results, 
and the "anomalies" variable is set to a list of strings representing 
the contents of anomalous downloads.

In my experience, somewhere around 10% to 20% of the time the downloaded 
file has some kind of anomaly. Anomalies that I have observed so far 
include:

- the file is not completely retrieved;

- the file is complete, but has the following text appended:

> 0
>
> - Peer has closed the GnuTLS connection

- the file contains only an HTTP header and nothing else:

> HTTP/1.1 200 OK
> Server: GitHub.com
> Date: Thu, 14 Nov 2013 20:54:41 GMT
> Content-Type: text/plain; charset=utf-8
> Transfer-Encoding: chunked
> Status: 200 OK
> Strict-Transport-Security: max-age=31536000
> X-XSS-Protection: 1; mode=block
> X-Content-Type-Options: nosniff
> X-UA-Compatible: chrome=1
> Access-Control-Allow-Origin: https://render.github.com

In all cases, "url-copy-file" returns t as if the retrieval was 
completely successful, so the only way to detect these anomalies is to 
inspect the file's content.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
`bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/Applications/Emacs.app/Contents/Resources/etc/DEBUG.


In GNU Emacs 24.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.36)
of 2013-03-12 on bob.porkrind.org
Windowing system distributor `Apple', version 10.3.1265
Configured using:
`configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin'
'--with-ns' 'build_alias=i686-apple-darwin'
'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.7
-isystem
/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include/
-F/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks''

Important settings:
locale-coding-system: nil
default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
diff-auto-refine-mode: t
recentf-mode: t
global-pretty-mode: t
pretty-mode: t
sml-modeline-mode: t
show-paren-mode: t
savehist-mode: t
minibuffer-electric-default-mode: t
minibuffer-depth-indicate-mode: t
ido-yes-or-no-mode: t
ido-ubiquitous-mode: t
icomplete-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
desktop-save-mode: t
delete-selection-mode: t
osx-pseudo-daemon-mode: t
lexbind-mode: t
ido-everywhere: t
shell-dirtrack-mode: t
eldoc-mode: t
autopair-global-mode: t
autopair-mode: t
global-auto-complete-mode: t
auto-complete-mode: t
override-global-mode: t
tooltip-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t

Recent input:
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <wheel-down> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <down-mouse-1> <mouse-1> C-x k
<return> <down-mouse-1> <mouse-1> C-h v a n o m a l
<return> <down-mouse-1> <mouse-1> C-M-f C-M-f C-M-f
C-M-f C-x o <up> <up> C-e <left> <left> <left> <down>
C-x C-g C-g C-g <wheel-up> <double-wheel-up> <triple-wheel-up>
<triple-wheel-up> <wheel-up> <double-wheel-up> <triple-wheel-up>
<down-mouse-1> <mouse-1> <up> <up> <up> <up> <up> <up>
<wheel-down> <double-wheel-down> <down-mouse-1> <mouse-1>
<C-S-right> <S-right> <backspace> C-M-k C-k <tab> <C-right>
<right> ( c o n a <backspace> s SPC C-y M-^ <right>
<backspace> <return> <tab> C-x C-s <up> <left> <right>
<left> <left> <right> <C-S-left> <backspace> a p p
<backspace> <backspace> <backspace> n c o n c SPC (
l i s t SPC : u c f - r e t u r n SPC C-d C-d ) <backspace>
C-e ) <down> <tab> C-e ) C-x C-s <up> <down> <down>
<down> <down> C-x C-x C-e C-g C-g <down> <down> <down>
<down> C-x C-e <help-echo> <wheel-down> <double-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down>
<wheel-up> <double-wheel-up> <wheel-up> <double-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <down-mouse-1> <mouse-1> <double-down-mouse-1>
<double-mouse-1> <triple-down-mouse-1> <triple-mouse-1>
<wheel-down> <double-wheel-down> <triple-wheel-down>
<triple-wheel-down> <down-mouse-1> <mouse-1> <wheel-up>
<double-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up>
<down-mouse-1> <mouse-1> <left> C-x o <C-home> C-x
h C-g C-g <down-mouse-1> <mouse-1> C-x C-w ~ / D r
o p <return> C-j M-x r e p o r t - <return>

Recent messages:
(:ucf-return t :has-content t :has-http-header nil :has-tls-closing t 
:can-load nil)
(:ucf-return t :has-content t :has-http-header nil :has-tls-closing nil 
:can-load t)
(:ucf-return t :has-content t :has-http-header nil :has-tls-closing t 
:can-load nil))

"
scroll-down: Beginning of buffer [21 times]
Mark set [3 times]
Quit [2 times]
Saving file /Users/ryan/Dropbox/emacs-url-download-bug.el...
Wrote /Users/ryan/Dropbox/emacs-url-download-bug.el

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Features:
(shadow sort mail-extr sgml-mode pcvs pcvs-parse pcvs-info pcvs-defs
ewoc macros gitignore-mode conf-mode em-glob esh-util mule-util
ebuff-menu electric esup benchmark thisismyfeature dired-x ielm etags
flyspell ispell tramp tramp-compat tramp-loaddefs view dabbrev
reposition mm-archive timezone parse-time cus-edit dired-aux
network-stream starttls url-http tls url-gw url-cache url-auth
url-handlers finder lisp-mnt skeleton autoinsert bs url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util url-parse auth-source gnus-util password-cache url-vars mailcap
cc-langs cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine rect smex debug misearch multi-isearch find-func async
magit-bisect magit-key-mode magit grep epa derived epg epg-config
diff-mode git-rebase-mode rx git-commit-mode log-edit pcvs-util add-log
recentf tree-widget wid-edit load-dir jka-compr markdown-mode essddr
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midnight saveplace uniquify sml-modeline paren savehist minibuf-eldef
mb-depth ido-yes-or-no ido-ubiquitous icomplete undo-tree diff desktop
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ess-utils ess-custom executable ess-compat ess-site highlight-cl
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el-get-methods el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg
el-get-git-svn el-get-fink el-get-emacswiki el-get-http
el-get-emacsmirror el-get-github el-get-git el-get-elpa el-get-darcs
el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get
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ido-yes-or-no-autoloads ignoramus-autoloads igrep-autoloads
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macro-utils-autoloads macrostep-autoloads
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cl-lib sudo-ext-autoloads undo-tree-autoloads unfill-autoloads
use-package-autoloads diminish-autoloads bind-key-autoloads
vlfi-autoloads volatile-highlights-autoloads websocket-autoloads
winpoint-autoloads package time-date tooltip ediff-hook vc-hooks
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czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process ns multi-tty emacs)