[Bug 76851] inotify_rm_watch(2) unspecified behavior

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org]

https://bugzilla.kernel.org/show_bug.cgi?id=76851

--- Comment #6 from Heinrich Schuchardt <xypron.glpk-Mmb7MZpHnFY@public.gmane.org> ---
Watch descriptor IDs are returned by inotify_add_watch.
When calling inotify_rm_watch an IN_IGNORE is placed on the inotify queue
pointing to the ID of the removed watch.

inotify_add_watch should not return a watch descriptor ID for which events are
still on the queue but should return an unused ID.

Unfortunately the existing Kernel code does not provide such a guarantee.

Actually in rare cases watch descriptor IDs are returned by inotify_add_watch
for which events are still on the inotify queue.

I verified the problem exists with the appended test program (test_wd_reuse.c).

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