bug#15695: 24.3; multiple async shell commands at once run randomly

[Nicolas Richard]

Hi,

Trying to debug a problem when pressing `&' in dired-mode with multiple
files marked, I found that running the following
$ emacs -q --eval '(shell-command "echo foo&echo bar&echo baz&")'
shows a *Async Shell Command* buffer with apparent random content.

I ran elisp which does something like the above 820 times. Here's what
happened (formatted as "output: number of times it appeared") :
"baz\nfoo\n": 236
"baz\nfoo\nbar\n": 73
"baz\n": 469
"baz\nbar\n": 29
"bar\nbaz\n": 5
"baz\nbar\nfoo\n": 1
"foo\nbaz\n": 6
"foo\nbar\nbaz\n": 1
which looks like random to me.

What I expected is to only see the lines with all of "foo" "baz" and
"bar" (in any order).

I have to say that it's not only a problem of output not seen in emacs :
replacing "echo" by "touch" like so:
$ rm -f foo bar baz; emacs -q --batch --eval '(shell-command "touch foo&touch 
bar&touch baz&")' --eval '(sit-for 1)'; ls -la
usually gives me only one or two files, instead of three (in an otherwise
empty dir)

Browsing through other bugs, I spotted the followings bug report which might be 
related:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=421

I run emacs --version : GNU Emacs 24.3.1
and GNU bash, version 4.2.45(1)-release (i686-pc-linux-gnu)

Here's the elisp used for the above statistics -- it uses
"start-process" directly instead of shell-command.

#+BEGIN_SRC emacs-lisp
  (defvar statistics nil "Hash table for keeping statistics")
  (defun yf/keep-stats (process change) "Used as sentinel"
    (with-current-buffer (process-buffer process)
      (if (equal change "finished\n")
          (puthash (buffer-string) (1+ (or (gethash (buffer-string) statistics) 
0)) statistics)
        (error "Unknown change for process %s: %s" process change))))
  (defun yf/pp-hash-table (hashtable) "Pretty print hash table"
    (let ((res))
      (maphash (lambda (k v) (setq res (concat res (yf/pp-hash--line k v)))) 
hashtable)
      (or res "")))
  (defun yf/pp-hash--line (key value) "Pretty print one hash line"
    (format "%s: %s\n" (pp key) (pp value)))
  (progn 
    (let ((n 820))
      (setq statistics (make-hash-table :test 'equal))
      (dotimes (i n)
        (let* ((buffername (concat "Shell-test" (number-to-string i)))
               (buffer (get-buffer-create buffername)))
          (with-current-buffer buffer
            (erase-buffer))
          (set-process-sentinel
           (start-process buffername
                          buffer
                          shell-file-name
                          shell-command-switch "echo foo&echo bar&echo baz")
           #'yf/keep-stats)))
      t)
    (sit-for 2)
    (insert (yf/pp-hash-table statistics)))
#+END_SRC

In GNU Emacs 24.3.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2013-10-14 on geodiff-mac3
Windowing system distributor `The X.Org Foundation', version 11.0.11304000
Configured using:
 `configure '--with-x-toolkit=lucid' '--enable-checking''

Important settings:
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  yas-global-mode: t
  TeX-PDF-mode: t
  diff-auto-refine-mode: t
  projectile-global-mode: t
  rcirc-track-minor-mode: t
  desktop-save-mode: t
  dynamic-completion-mode: t
  shell-dirtrack-mode: t
  show-paren-mode: t
  recentf-mode: t
  winner-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC C-e C-d C-e SPC ? C-n C-SPC <C-end> C-w <return> 
<backspace> <backspace> SPC I t ' s SPC b u i l t SPC 
<backspace> - i n SPC f o r SPC m e SPC C-u M-x e m 
a c s - v e r s i o n <return> C-x C-x M-f M-f M-f 
M-f M-f M-f M-f M-f M-f C-f C-f C-M-k SPC t o o C-k 
. <up> <C-end> <up> <end> <C-left> <left> SPC o n M-q 
<C-end> <return> <return> N i <backspace> <backspace> 
N i c o . <return> <up> - - SPC <return> <end> <C-end> 
<up> <up> <end> <up> <up> <up> <up> <up> <up> <up> 
<down> <home> C-SPC <C-home> <C-down> <C-down> C-w 
<C-end> C-c C-c / N q g <C-home> <return> <return> 
n n n SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC n n n 
n k q <return> q C-n C-n C-n C-n C-n C-n <return> c 
C-g C-n <return> F <C-end> <up> <up> <up> C-SPC <C-end> 
C-w <return> D i d SPC y o u SPC t r y SPC b y SPC 
r e c o m p i l i n g SPC r c i r c . e l SPC ? M-b 
M-b M-x f i n d SPC l i b <tab> <return> <return> C-x 
K M-b M-b M-d C-d C-e C-n C-p C-n C-c C-k y e s <return> 
C-p <return> c y g <return> <return> q <return> n n 
n n n C-p <return> ^ q g <return> <return> , c y q 
g C-g q y C-c C-SPC ESC [ > 1 ; 3 2 0 1 ; 0 c ESC x 
r e p o r t SPC e m TAB SPC b u DEL DEL TAB RET

Recent messages:
Are you sure you want to quit reading news? (y or n)  y
Saving file /home/youngfrog/.newsrc...
Wrote /home/youngfrog/.newsrc
Saving /home/youngfrog/.newsrc.eld...
Saving file /home/youngfrog/.newsrc.eld...
Wrote /home/youngfrog/.newsrc.eld
Saving /home/youngfrog/.newsrc.eld...done
Cleaning up the recentf list...done (0 removed)
Contacting host: www.emacswiki.org:80 [5 times]
When done with this frame, type C-x 5 0

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Features:
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mailcap gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start
gnus-spec gnus-int gnus-range message cl-macs gv rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems
nnheader mail-utils wid-edit cl find-lisp dired org-inlinetask org
warnings org-macro org-footnote org-pcomplete pcomplete org-list
org-faces org-entities noutline outline org-version ob-emacs-lisp ob
ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint comint
ansi-color ob-core ob-eval org-compat org-macs format-spec find-func
cal-menu calendar cal-loaddefs time ffap url-parse auth-source eieio
byte-opt bytecomp byte-compile cconv gnus-util time-date mm-util
mail-prsvr password-cache url-vars winner ring edmacro kmacro
magit-autoloads two-mode-mode tex-site auto-loads org-loaddefs ido-hacks
advice help-fns cl-lib advice-preload easy-mmode ido info easymenu
server tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak 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 dbusbind
dynamic-setting system-font-setting font-render-setting x-toolkit x
multi-tty emacs)