bug#26126: 26.0.50; file-notify-rm-watch removes arbitrary watches

[Andreas Politz]

The descriptor returned by file-notify-add-watch is of the form (ID . DIR)
(at least when using inotify) and these descriptors are stored in a
hash-table using equal as comparator.

If multiple clients watch the same file and one of them removes its watch
via file-notify-rm-watch, the result is unpredictable. I.e. the function
removes some watch (I believe it is the last one added), but not necessarily
the one associated with the client calling file-notify-rm-watch on the
descriptor it got from calling file-notify-add-watch.

I've attached a test case for this.

Am I missing something here ?

-ap

file-notify-bug-1.el
Description: test case

In GNU Emacs 26.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.22.9)
 of 2017-03-15 built on luca
Repository revision: 2f972349bdc99d5d9ebf63169c00e24b119aa38d
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description:     Arch Linux

Recent messages:
Delete all tests? (y or n) y
file-notify-rm-out-of-order
Ran 1 tests, 0 results were as expected
Quit
Undo! [2 times]
Mark set
C-c C-t is undefined
Test result: FAILED ()
Quit
Mark set [2 times]

Configured using:
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TOOLKIT_SCROLL_BARS GTK3 X11 XWIDGETS LIBSYSTEMD

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x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify dynamic-setting system-font-setting
font-render-setting xwidget-internal move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 1130920 1240746)
 (symbols 48 72148 48)
 (miscs 40 1245 8418)
 (strings 32 198145 372410)
 (string-bytes 1 7746812)
 (vectors 16 94275)
 (vector-slots 8 2251986 397758)
 (floats 8 590 1337)
 (intervals 56 63082 4479)
 (buffers 968 342))