GNU bug report logs - #39158
26.1; url-retrieve-synchronously possible race condition

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Package: emacs;

Reported by: Ernesto Alfonso <erjoalgo <at> gmail.com>

Date: Fri, 17 Jan 2020 01:05:02 UTC

Severity: normal

Tags: fixed

Merged with 34341

Found in version 26.1

Fixed in versions 26.3, 27.1

Done: Noam Postavsky <npostavs <at> gmail.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#39158; Package emacs. (Fri, 17 Jan 2020 01:05:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Ernesto Alfonso <erjoalgo <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Fri, 17 Jan 2020 01:05:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ernesto Alfonso <erjoalgo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; url-retrieve-synchronously possible race condition
Date: Thu, 16 Jan 2020 17:04:06 -0800
[Message part 1 (text/plain, inline)]
url-retrieve-synchronously unexpectedly returns an empty buffer:

emacs -Q --eval '(with-current-buffer (url-retrieve-synchronously "
https://google.com") (print (buffer-string)))' --batch
Contacting host: google.com:443

""

If I add (sit-for 2) in url-retrieve-synchronously after the (url-retrieve
...) call:

    (setq asynch-buffer
     (url-retrieve url (lambda (&rest ignored)
         (url-debug 'retrieval "Synchronous fetching done (%S)"
(current-buffer))
         (setq retrieval-done t
       asynch-buffer (current-buffer)))
    nil silent inhibit-cookies))
    (sit-for 2)

then I see the expected output.


In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
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Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#39158; Package emacs. (Fri, 17 Jan 2020 17:47:01 GMT) Full text and rfc822 format available.

Message #8 received at 39158 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Ernesto Alfonso <erjoalgo <at> gmail.com>
Cc: 39158 <at> debbugs.gnu.org
Subject: Re: bug#39158: 26.1;
 url-retrieve-synchronously possible race condition
Date: Fri, 17 Jan 2020 12:46:01 -0500
unarchive 34341
forcemerge 34341 39158
quit

Ernesto Alfonso <erjoalgo <at> gmail.com> writes:

> url-retrieve-synchronously unexpectedly returns an empty buffer:
>
> emacs -Q --eval '(with-current-buffer (url-retrieve-synchronously "
> https://google.com") (print (buffer-string)))' --batch
> Contacting host: google.com:443
>
> ""
>
> If I add (sit-for 2) in url-retrieve-synchronously after the (url-retrieve
> ...) call:
>
>     (setq asynch-buffer
>      (url-retrieve url (lambda (&rest ignored)
>          (url-debug 'retrieval "Synchronous fetching done (%S)"
> (current-buffer))
>          (setq retrieval-done t
>        asynch-buffer (current-buffer)))
>     nil silent inhibit-cookies))
>     (sit-for 2)
>
> then I see the expected output.
>
>
> In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)

Looks like Bug#34341, try upgrading to 26.3, or put

    (setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")

in your init file as a temporary workaround.




Forcibly Merged 34341 39158. Request was from Noam Postavsky <npostavs <at> gmail.com> to control <at> debbugs.gnu.org. (Fri, 17 Jan 2020 17:47:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sat, 15 Feb 2020 12:24:05 GMT) Full text and rfc822 format available.

bug unarchived. Request was from David Greaves <david <at> dgreaves.com> to control <at> debbugs.gnu.org. (Wed, 11 Nov 2020 13:13:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Thu, 10 Dec 2020 12:24:04 GMT) Full text and rfc822 format available.

This bug report was last modified 3 years and 149 days ago.

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