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bug#18361: New 'sort' implementation can crash Emacs
From: |
Dmitry Antipov |
Subject: |
bug#18361: New 'sort' implementation can crash Emacs |
Date: |
Sat, 30 Aug 2014 09:07:46 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 08/30/2014 03:07 AM, Paul Eggert wrote:
Sure, a comparison function that returns a new random value every
time you call it. Such a function is most likely not well formed
that is, it most likely does not define a total order.
If an undefined behavior doesn't cause crash, I don't see a problem
if this is well-documented (probably in lispref).
I gave this function a solid run on GNU/Linux (glibc 2.18) and FreeBSD
10.0, and was unable to crash:
(defun sort-run ()
(interactive)
(let* ((max 1000000)
(size 1000)
(p (make-progress-reporter "Sorted: " 0 max)))
(dotimes (loops max)
(let ((v (make-vector size 0)))
(dotimes (i size) (aset v i (% (random) (* size 2))))
(sort v (lambda (x y) (random)))
(progress-reporter-update p loops)))
(progress-reporter-done p)))
I don't have any reasons to not trust in your experience, but I'm
really curious to look at the real example crashing qsort(_r) due
to ill-formed comparison function.
Dmitry
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/29
- bug#18361: New 'sort' implementation can crash Emacs, Dmitry Antipov, 2014/08/29
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/29
- bug#18361: New 'sort' implementation can crash Emacs,
Dmitry Antipov <=
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/30
- bug#18361: New 'sort' implementation can crash Emacs, Dmitry Antipov, 2014/08/30
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/30
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/30
- bug#18361: New 'sort' implementation can crash Emacs, Eli Zaretskii, 2014/08/30
- bug#18361: New 'sort' implementation can crash Emacs, Paul Eggert, 2014/08/31
- bug#18361: New 'sort' implementation can crash Emacs, Eli Zaretskii, 2014/08/31