GNU bug report logs -
#34341
26.1; url-retrieve-synchronously returns blank buffer
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Reported by: Laurent Charignon <l.charignon <at> gmail.com>
Date: Wed, 6 Feb 2019 07:11:01 UTC
Severity: normal
Tags: fixed
Merged with 39158
Found in version 26.1
Fixed in versions 26.3, 27.1
Done: Noam Postavsky <npostavs <at> gmail.com>
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#### Context
The symptom of this issue first came up in the context of `ghub`, a package
that offers interfacing with Github from emacs (issue:
https://github.com/magit/ghub/issues/81).
Multiple users of the `ghub` package started observing that
synchronously retrieving content from the github API through ghub
returned blank responses.
I investigated and narrowed down a minimal repro case of the problem,
which I believe indicate that the problem is in Emacs itself.
#### Steps to reproduce
1) Run emacs -Q
2) Evaluate the following elisp snippet
```
(switch-to-buffer (url-retrieve-synchronously "
https://api.github.com/users/charignon/repos")
(buffer-string))
```
I expect then to see a buffer with an http response, instead I get a
blank buffer.
#### Investigation / Observation
1) This behavior reproduces consistently with api.github.com, not with
any websites that I tried.
2) `url-retrieve`, the asynchronous way to fetch url, does not seem to be
subject to the issue, and works as expected, for
example:
```
(url-retrieve "https://api.github.com/users/charignon/repos" (lambda (x
&rest v) x))
```
works
3) Once a connection is established (for example by `url-retrieve`) and
can be reused, then `url-retrieve-synchronously` works. That is, the
snippet above returns a buffer with an HTTP response from github. Removing
the connection (emacs process managing it) is necessary after you ran
`url-retrieve` if you want to reproduce the bug.
4) I used wireshark to look at the network traffic:
Here is the trace for the `url-retrieve-synchronously` call to github
(from steps to reproduce):
I blurred out the info field for DNS packets (not relevant)
```
No. Time Source Destination Protocol
Length Info
9 1.658218501 vulture.lan testwifi.here DNS
74 XXX
10 1.658260266 vulture.lan testwifi.here DNS
74 XXX
11 1.665053481 testwifi.here vulture.lan DNS
158 XXX
12 1.703946584 testwifi.here vulture.lan DNS
106 XXX
13 1.704485426 vulture.lan api.github.com TCP
74 55424 → https(443) [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1
TSval=2499281666 TSecr=0 WS=128
14 1.728009793 api.github.com vulture.lan TCP
74 https(443) → 55424 [SYN, ACK] Seq=0 Ack=1 Win=28480 Len=0 MSS=1436
SACK_PERM=1 TSval=3029633168 TSecr=2499281666 WS=1024
15 1.728074018 vulture.lan api.github.com TCP
66 55424 → https(443) [ACK] Seq=1 Ack=1 Win=29312 Len=0
TSval=2499281689 TSecr=3029633168
16 1.748051225 vulture.lan api.github.com TLSv1.3
583 Client Hello
17 1.773082726 api.github.com vulture.lan TLSv1.3
1490 Server Hello, Change Cipher Spec, Encrypted Extensions
18 1.773104270 vulture.lan api.github.com TCP
66 55424 → https(443) [ACK] Seq=518 Ack=1425 Win=32128 Len=0
TSval=2499281734 TSecr=3029633179
19 1.773405428 vulture.lan api.github.com TLSv1.3
72 Change Cipher Spec
20 1.774050525 api.github.com vulture.lan TCP
1490 https(443) → 55424 [ACK] Seq=1425 Ack=518 Win=29696 Len=1424
TSval=3029633179 TSecr=2499281709 [TCP segment of a reassembled PDU]
21 1.775039404 api.github.com vulture.lan TLSv1.3
615 Certificate, Certificate Verify, Finished
22 1.775047977 vulture.lan api.github.com TCP
66 55424 → https(443) [ACK] Seq=524 Ack=3398 Win=37760 Len=0
TSval=2499281736 TSecr=3029633179
23 1.838313183 api.github.com vulture.lan TCP
66 https(443) → 55424 [ACK] Seq=3398 Ack=524 Win=29696 Len=0
TSval=3029633196 TSecr=2499281735
24 1.838358258 vulture.lan api.github.com HTTP
388 GET /users/charignon/repos HTTP/1.1
25 1.861920124 api.github.com vulture.lan TCP
66 https(443) → 55424 [ACK] Seq=3398 Ack=846 Win=30720 Len=0
TSval=3029633201 TSecr=2499281800
26 1.862284763 api.github.com vulture.lan TLSv1.3
145 New Session Ticket
27 1.862648197 api.github.com vulture.lan TLSv1.3
145 New Session Ticket
28 1.864591679 vulture.lan api.github.com TCP
66 55424 → https(443) [RST, ACK] Seq=846 Ack=3556 Win=37760 Len=0
TSval=2499281826 TSecr=3029633201
29 1.866733948 vulture.lan testwifi.here DNS
74 XXX
30 1.866762442 vulture.lan testwifi.here DNS
74 XXX
31 1.874549249 testwifi.here vulture.lan DNS
158 XXX
32 1.900313841 testwifi.here vulture.lan DNS
106 XXX
33 1.900576751 vulture.lan api.github.com TCP
74 43292 → https(443) [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1
TSval=4190850269 TSecr=0 WS=128
34 1.903210022 vulture.lan testwifi.here DNS
88 XXX
35 1.903272421 vulture.lan testwifi.here DNS
87 XXX
36 1.903318706 vulture.lan testwifi.here DNS
86 XXX
37 1.903361506 vulture.lan testwifi.here DNS
85 XXX
38 1.906623630 testwifi.here vulture.lan DNS
137 XXX
39 1.906956508 testwifi.here vulture.lan DNS
137 XXX
40 1.907649896 testwifi.here vulture.lan DNS
87 XXX
41 1.908724609 testwifi.here vulture.lan DNS
156 XXX
42 1.925632754 api.github.com vulture.lan TCP
74 https(443) → 43292 [SYN, ACK] Seq=0 Ack=1 Win=28480 Len=0 MSS=1436
SACK_PERM=1 TSval=3140518241 TSecr=4190850269 WS=1024
43 1.925691567 vulture.lan api.github.com TCP
66 43292 → https(443) [ACK] Seq=1 Ack=1 Win=29312 Len=0
TSval=4190850294 TSecr=3140518241
44 1.926622012 vulture.lan api.github.com HTTP
308 GET /users/charignon/repos HTTP/1.1
45 1.950026748 api.github.com vulture.lan TCP
66 https(443) → 43292 [FIN, ACK] Seq=1 Ack=243 Win=29696 Len=0
TSval=3140518247 TSecr=4190850295
46 1.950219585 vulture.lan api.github.com TCP
66 43292 → https(443) [FIN, ACK] Seq=243 Ack=2 Win=29312 Len=0
TSval=4190850318 TSecr=3140518247
47 1.972892477 api.github.com vulture.lan TCP
66 https(443) → 43292 [ACK] Seq=2 Ack=244 Win=29696 Len=0
TSval=3140518253 TSecr=4190850318
```
vulture.lan is my computer.
testwifi.here is my DNS.
starting at packet 33 we talk to a second github server, not like the one
we talk to in packet 13.
I configured wireshark to inspect encrypted traffic to see the HTTP
request in there.
What you can notice is that in the synchronous (failing) case, packet 28
is resetting (unexpectedly as far as I can tell) the TCP connection, and
we attempt a retry, which does not work.
And here is the trace for the `url-retrieve` case, where everything goes
well:
```
No. Time Source Destination Protocol
Length Info
1 0.000000000 vulture.lan testwifi.here DNS
74 XXX
2 0.000068027 vulture.lan testwifi.here DNS
74 XXX
3 0.008919887 testwifi.here vulture.lan DNS
158 XXX
4 0.035184884 testwifi.here vulture.lan DNS
106 XXX
5 0.107029734 vulture.lan api.github.com TCP
74 55428 → https(443) [SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1
TSval=2499323470 TSecr=0 WS=128
6 0.134137564 api.github.com vulture.lan TCP
74 https(443) → 55428 [SYN, ACK] Seq=0 Ack=1 Win=28480 Len=0 MSS=1436
SACK_PERM=1 TSval=2535678566 TSecr=2499323470 WS=1024
7 0.134221939 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=1 Ack=1 Win=29312 Len=0
TSval=2499323498 TSecr=2535678566
8 0.134313037 vulture.lan api.github.com TLSv1.3
583 Client Hello
9 0.162958206 api.github.com vulture.lan TLSv1.3
1490 Server Hello, Change Cipher Spec, Encrypted Extensions
10 0.163005821 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=518 Ack=1425 Win=32128 Len=0
TSval=2499323526 TSecr=2535678573
11 0.163752256 api.github.com vulture.lan TCP
1490 https(443) → 55428 [ACK] Seq=1425 Ack=518 Win=29696 Len=1424
TSval=2535678573 TSecr=2499323498 [TCP segment of a reassembled PDU]
12 0.163769338 vulture.lan api.github.com TLSv1.3
72 Change Cipher Spec
13 0.164938244 api.github.com vulture.lan TLSv1.3
615 Certificate, Certificate Verify, Finished
14 0.164970615 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=524 Ack=3398 Win=37760 Len=0
TSval=2499323528 TSecr=2535678573
15 0.229427678 api.github.com vulture.lan TCP
66 https(443) → 55428 [ACK] Seq=3398 Ack=524 Win=29696 Len=0
TSval=2535678590 TSecr=2499323527
16 0.229496471 vulture.lan api.github.com HTTP
388 GET /users/charignon/repos HTTP/1.1
17 0.253820590 api.github.com vulture.lan TCP
66 https(443) → 55428 [ACK] Seq=3398 Ack=846 Win=30720 Len=0
TSval=2535678596 TSecr=2499323593
18 0.255187068 api.github.com vulture.lan TLSv1.3
145 New Session Ticket
19 0.256462285 api.github.com vulture.lan TLSv1.3
145 New Session Ticket
20 0.256590338 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=3556 Win=37760 Len=0
TSval=2499323620 TSecr=2535678596
21 0.485155486 api.github.com vulture.lan TLSv1.3
1458 [SSL segment of a reassembled PDU]
22 0.485523530 api.github.com vulture.lan TLSv1.3
1458 [SSL segment of a reassembled PDU]
23 0.485567467 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=6340 Win=43392 Len=0
TSval=2499323849 TSecr=2535678654
24 0.486210922 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU]
25 0.486551493 api.github.com vulture.lan TLSv1.3
1276 [SSL segment of a reassembled PDU]
26 0.486588968 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=8974 Win=49152 Len=0
TSval=2499323850 TSecr=2535678654
27 0.487345701 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU]
28 0.487710595 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU] [TCP segment of a reassembled PDU]
29 0.487741685 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=11822 Win=54784 Len=0
TSval=2499323851 TSecr=2535678654
30 0.489279277 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU] [TCP segment of a reassembled PDU]
31 0.490560244 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU] [TCP segment of a reassembled PDU]
32 0.490600325 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=14670 Win=60544 Len=0
TSval=2499323854 TSecr=2535678654
33 0.491903018 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU] [TCP segment of a reassembled PDU]
34 0.493248621 api.github.com vulture.lan TLSv1.3
1490 [SSL segment of a reassembled PDU] [TCP segment of a reassembled PDU]
35 0.493286446 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=17518 Win=66176 Len=0
TSval=2499323857 TSecr=2535678654
36 0.501270566 vulture.lan testwifi.here DNS
86 XXX
37 0.501341962 vulture.lan testwifi.here DNS
85 XXX
38 0.503268399 testwifi.here vulture.lan DNS
137 XXX
39 0.504365465 testwifi.here vulture.lan DNS
137 XXX
40 0.507593395 api.github.com vulture.lan HTTP
75 HTTP/1.1 200 OK (application/json)
41 0.549680721 vulture.lan api.github.com TCP
66 55428 → https(443) [ACK] Seq=846 Ack=17527 Win=66176 Len=0
TSval=2499323913 TSecr=2535678660
```
5) I noticed that adding `(sit-for 0.5)` in various places throughout the
codepath would consistently make the bug go away. For example in
`open-network-stream` after opening the stream, or at the beginning of
`url-http-create-request`.
6) I couldn't find information online indicating that github changed
anything in their network request handling that broke other tools.
I am using Emacs 26.1:
In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
of 2018-07-05 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12003000
System Description: Manjaro Linux
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I built the latest master I could find in git
(5259fdf96073febd18e83785960c443bdf02a31) and the bug seems fixed there!
From bisecting, I know that the fix is in between 191a5568db (working) and
2a3bd6798e96708 (not working). It is hard to pinpoint further due to
segfaults that were introduced then fixed in this range. My best guess is
that "Fix unlikely races with GnuTLS, datagrams" (e87e6a24c4) resolved this.
[Message part 2 (text/html, inline)]
bug Marked as fixed in versions 27.1.
Request was from
Glenn Morris <rgm <at> gnu.org>
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control <at> debbugs.gnu.org.
(Wed, 06 Feb 2019 18:30:02 GMT)
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Message #13 received at 34341 <at> debbugs.gnu.org (full text, mbox):
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I've also hit this bug, here's a couple of observations:
(1) Looks like the version of gnutls affects the behavior of
url-retrieve-synchronously.
My conclusion is that the bug manifests with gnutls >= 3.6. I confirmed
this on Arch with
emacs 26.1 and on Ubuntu bionic/cosmic with emacs 25.2
(2) Weird workaround, which works for me: add (setq gnutls-log-level 1) to
the end of init.el
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Message #16 received at 34341 <at> debbugs.gnu.org (full text, mbox):
Laurent Charignon <l.charignon <at> gmail.com> writes:
> #### Context
>
> The symptom of this issue first came up in the context of `ghub`, a package
> that offers interfacing with Github from emacs (issue:
> https://github.com/magit/ghub/issues/81).
>
> Multiple users of the `ghub` package started observing that
> synchronously retrieving content from the github API through ghub
> returned blank responses.
> (switch-to-buffer (url-retrieve-synchronously "
> https://api.github.com/users/charignon/repos")
> (buffer-string))
> From bisecting, I know that the fix is in between 191a5568db (working) and
> 2a3bd6798e96708 (not working). It is hard to pinpoint further due to
> segfaults that were introduced then fixed in this range. My best guess is
> that "Fix unlikely races with GnuTLS, datagrams" (e87e6a24c4) resolved this.
I can confirm that cherrypicking this commit fixes the problem on my
Arch box which has gnutls 3.6.7 (doesn't occur at all on my Debian box
with gnutls 3.5.8).
Since the only recourse for users hitting is rebuilding --without-gnutls
or (advice-add 'gnutls-available-p :override #'ignore) which falls back
to the obsolete tls.el, I'd say this is important enough to backport to
emacs-26. I'll do that in a couple of days if there are no objections.
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Message #19 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Sat, 04 May 2019 11:18:30 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
Noam> Laurent Charignon <l.charignon <at> gmail.com> writes:
>> #### Context
>>
>> The symptom of this issue first came up in the context of
>> `ghub`, a package that offers interfacing with Github from
>> emacs (issue: https://github.com/magit/ghub/issues/81).
>>
>> Multiple users of the `ghub` package started observing that
>> synchronously retrieving content from the github API through
>> ghub returned blank responses.
>> (switch-to-buffer (url-retrieve-synchronously "
>> https://api.github.com/users/charignon/repos") (buffer-string))
>> From bisecting, I know that the fix is in between 191a5568db
>> (working) and 2a3bd6798e96708 (not working). It is hard to
>> pinpoint further due to segfaults that were introduced then
>> fixed in this range. My best guess is that "Fix unlikely races
>> with GnuTLS, datagrams" (e87e6a24c4) resolved this.
Noam> I can confirm that cherrypicking this commit fixes the
Noam> problem on my Arch box which has gnutls 3.6.7 (doesn't occur
Noam> at all on my Debian box with gnutls 3.5.8).
Noam> Since the only recourse for users hitting is rebuilding
Noam> --without-gnutls or (advice-add 'gnutls-available-p
Noam> :override #'ignore) which falls back to the obsolete tls.el,
Noam> I'd say this is important enough to backport to emacs-26.
Noam> I'll do that in a couple of days if there are no objections.
Are you sure thatʼs the only recourse? When I hit this issue, turning
off TLS1.3 support helped as well. (see
<https://lists.gnu.org/archive/html/emacs-devel/2019-02/msg00393.html>
and
<https://lists.gnu.org/archive/html/help-gnu-emacs/2019-02/msg00196.html>)
Something like:
(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
would be one way to turn off TLS1.3
Robert
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Message #22 received at 34341 <at> debbugs.gnu.org (full text, mbox):
Robert Pluim <rpluim <at> gmail.com> writes:
>>>>>> On Sat, 04 May 2019 11:18:30 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
>
> Noam> I can confirm that cherrypicking this commit fixes the
> Noam> problem on my Arch box which has gnutls 3.6.7 (doesn't occur
> Noam> at all on my Debian box with gnutls 3.5.8).
>
> Noam> Since the only recourse for users hitting is rebuilding
> Noam> --without-gnutls or (advice-add 'gnutls-available-p
> Noam> :override #'ignore) which falls back to the obsolete tls.el,
> Noam> I'd say this is important enough to backport to emacs-26.
> Noam> I'll do that in a couple of days if there are no objections.
>
> Are you sure thatʼs the only recourse? When I hit this issue, turning
> off TLS1.3 support helped as well. (see
> <https://lists.gnu.org/archive/html/emacs-devel/2019-02/msg00393.html>
> and
> <https://lists.gnu.org/archive/html/help-gnu-emacs/2019-02/msg00196.html>)
>
> Something like:
>
> (setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
>
> would be one way to turn off TLS1.3
Thanks, I wasn't aware of this, I'll check if that helps later today. I
think it makes sense to backport regardless though.
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Message #25 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Mon, 06 May 2019 08:10:32 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
Noam> Thanks, I wasn't aware of this, I'll check if that helps
Noam> later today. I think it makes sense to backport regardless
Noam> though.
I do too, but last time Eli wasn't too enthusiastic about it.
Robert
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Message #28 received at 34341 <at> debbugs.gnu.org (full text, mbox):
> From: Robert Pluim <rpluim <at> gmail.com>
> Date: Mon, 06 May 2019 14:15:27 +0200
> Cc: Laurent Charignon <l.charignon <at> gmail.com>, 34341 <at> debbugs.gnu.org
>
> >>>>> On Mon, 06 May 2019 08:10:32 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
>
> Noam> Thanks, I wasn't aware of this, I'll check if that helps
> Noam> later today. I think it makes sense to backport regardless
> Noam> though.
>
> I do too, but last time Eli wasn't too enthusiastic about it.
It's a complex change, and we don't even know whether emacs-26 will be
used for another "regular" release. What if we need it for some
emergency release, for example? Having to remember there was this
cherry-pick, and branching from before it, reverting it, is not my
idea of fun.
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Message #31 received at 34341 <at> debbugs.gnu.org (full text, mbox):
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Eli Zaretskii <eliz <at> gnu.org> writes:
>> From: Robert Pluim <rpluim <at> gmail.com>
>> Date: Mon, 06 May 2019 14:15:27 +0200
>> Cc: Laurent Charignon <l.charignon <at> gmail.com>, 34341 <at> debbugs.gnu.org
>>
>> >>>>> On Mon, 06 May 2019 08:10:32 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
>>
>> Noam> Thanks, I wasn't aware of this, I'll check if that helps
>> Noam> later today. I think it makes sense to backport regardless
>> Noam> though.
I can confirm that
(setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
avoids the problem on my Arch box (has gnutls v3.6.7).
>> I do too, but last time Eli wasn't too enthusiastic about it.
>
> It's a complex change, and we don't even know whether emacs-26 will be
> used for another "regular" release. What if we need it for some
> emergency release, for example? Having to remember there was this
> cherry-pick, and branching from before it, reverting it, is not my
> idea of fun.
I found this smaller change fixes it also. Is it simple enough to for
emacs-26? Otherwise, we should set gnutls-algorithm-priority because
(as far as I understand) we have a broken TLS1.3 implementation at the
momement.
[0001-Handle-GNUTLS_E_AGAIN-in-emacs_gnutls_read-Bug-34341.patch (text/x-diff, inline)]
From 6d5f5670443f7adfbd6993173ad997ce25827775 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs <at> gmail.com>
Date: Mon, 6 May 2019 19:55:17 -0400
Subject: [PATCH] Handle GNUTLS_E_AGAIN in emacs_gnutls_read (Bug#34341)
* src/gnutls.c (emacs_gnutls_read): Similar to emacs_gnutls_write,
when gnutls_record_recv returns GNUTLS_E_AGAIN set errno to EGAIN.
---
src/gnutls.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/gnutls.c b/src/gnutls.c
index 3c16b6c9c3..b724c3592d 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -753,8 +753,15 @@ emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte)
/* The peer closed the connection. */
return 0;
else if (emacs_gnutls_handle_error (state, rtnval))
- /* non-fatal error */
- return -1;
+ {
+ /* If we get GNUTLS_E_AGAIN, then set errno appropriately so that
+ wait_reading_process_output retries the correct way instead of
+ erroring out. */
+ if (rtnval == GNUTLS_E_AGAIN)
+ errno = EAGAIN;
+ /* non-fatal error */
+ return -1;
+ }
else {
/* a fatal error occurred */
return 0;
--
2.11.0
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Message #34 received at 34341 <at> debbugs.gnu.org (full text, mbox):
> From: Noam Postavsky <npostavs <at> gmail.com>
> Cc: Robert Pluim <rpluim <at> gmail.com>, 34341 <at> debbugs.gnu.org, l.charignon <at> gmail.com
> Date: Mon, 06 May 2019 20:16:52 -0400
>
> I found this smaller change fixes it also. Is it simple enough to for
> emacs-26?
Yes, if we are sure it fixes the problem.
Thanks.
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Message #37 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Mon, 06 May 2019 20:16:52 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
Noam> Eli Zaretskii <eliz <at> gnu.org> writes:
>>> From: Robert Pluim <rpluim <at> gmail.com> Date: Mon, 06 May 2019
>>> 14:15:27 +0200 Cc: Laurent Charignon <l.charignon <at> gmail.com>,
>>> 34341 <at> debbugs.gnu.org
>>>
>>> >>>>> On Mon, 06 May 2019 08:10:32 -0400, Noam Postavsky
>>> <npostavs <at> gmail.com> said:
>>>
Noam> Thanks, I wasn't aware of this, I'll check if that helps
Noam> later today. I think it makes sense to backport regardless
Noam> though.
Noam> I can confirm that
Noam> (setq gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
Noam> avoids the problem on my Arch box (has gnutls v3.6.7).
OK, so itʼs the same issue.
Noam> I found this smaller change fixes it also. Is it simple
Noam> enough to for emacs-26? Otherwise, we should set
Noam> gnutls-algorithm-priority because (as far as I understand)
Noam> we have a broken TLS1.3 implementation at the momement.
If we do decide to disable TLS1.3, which Iʼm not really in favour of,
changing the defaults in lisp/net/gnutls.el:gnutls-boot-parameters
might be better than setting gnutls-algorithm-priority. Iʼd prefer
your gnutls.c patch, although I haven't had a chance to test it yet.
Robert
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Message #40 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Tue, 07 May 2019 08:35:00 +0200, Robert Pluim <rpluim <at> gmail.com> said:
>>>>> On Mon, 06 May 2019 20:16:52 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
Noam> I found this smaller change fixes it also. Is it simple
Noam> enough to for emacs-26? Otherwise, we should set
Noam> gnutls-algorithm-priority because (as far as I understand)
Noam> we have a broken TLS1.3 implementation at the momement.
Robert> If we do decide to disable TLS1.3, which Iʼm not really in
Robert> favour of, changing the defaults in
Robert> lisp/net/gnutls.el:gnutls-boot-parameters might be better
Robert> than setting gnutls-algorithm-priority. Iʼd prefer your
Robert> gnutls.c patch, although I haven't had a chance to test it
Robert> yet.
That patch to src/gnutls.c fixes my testcase, which is imap over
TLS1.3 to gmail. Itʼs pretty simple, I think it could go to
emacs-26. Eli?
Robert
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Message #43 received at 34341 <at> debbugs.gnu.org (full text, mbox):
> From: Robert Pluim <rpluim <at> gmail.com>
> Date: Sun, 12 May 2019 15:01:03 +0200
> Cc: l.charignon <at> gmail.com, 34341 <at> debbugs.gnu.org
>
> >>>>> On Mon, 06 May 2019 20:16:52 -0400, Noam Postavsky <npostavs <at> gmail.com> said:
> Noam> I found this smaller change fixes it also. Is it simple
> Noam> enough to for emacs-26? Otherwise, we should set
> Noam> gnutls-algorithm-priority because (as far as I understand)
> Noam> we have a broken TLS1.3 implementation at the momement.
>
> Robert> If we do decide to disable TLS1.3, which Iʼm not really in
> Robert> favour of, changing the defaults in
> Robert> lisp/net/gnutls.el:gnutls-boot-parameters might be better
> Robert> than setting gnutls-algorithm-priority. Iʼd prefer your
> Robert> gnutls.c patch, although I haven't had a chance to test it
> Robert> yet.
>
> That patch to src/gnutls.c fixes my testcase, which is imap over
> TLS1.3 to gmail. Itʼs pretty simple, I think it could go to
> emacs-26. Eli?
Didn't I already answer that? If not, I guess you are now talking
about some patch which I didn't see, so please show it.
Thanks.
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(Sun, 12 May 2019 14:56:02 GMT)
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Message #46 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Sun, 12 May 2019 17:02:56 +0300, Eli Zaretskii <eliz <at> gnu.org> said:
>> That patch to src/gnutls.c fixes my testcase, which is imap
>> over TLS1.3 to gmail. Itʼs pretty simple, I think it could go
>> to emacs-26. Eli?
Eli> Didn't I already answer that? If not, I guess you are now
Eli> talking about some patch which I didn't see, so please show
Eli> it.
From 6d5f5670443f7adfbd6993173ad997ce25827775 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs <at> gmail.com>
Date: Mon, 6 May 2019 19:55:17 -0400
Subject: [PATCH] Handle GNUTLS_E_AGAIN in emacs_gnutls_read (Bug#34341)
* src/gnutls.c (emacs_gnutls_read): Similar to emacs_gnutls_write,
when gnutls_record_recv returns GNUTLS_E_AGAIN set errno to EGAIN.
---
src/gnutls.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/gnutls.c b/src/gnutls.c
index 3c16b6c9c3..b724c3592d 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -753,8 +753,15 @@ emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte)
/* The peer closed the connection. */
return 0;
else if (emacs_gnutls_handle_error (state, rtnval))
- /* non-fatal error */
- return -1;
+ {
+ /* If we get GNUTLS_E_AGAIN, then set errno appropriately so that
+ wait_reading_process_output retries the correct way instead of
+ erroring out. */
+ if (rtnval == GNUTLS_E_AGAIN)
+ errno = EAGAIN;
+ /* non-fatal error */
+ return -1;
+ }
else {
/* a fatal error occurred */
return 0;
--
2.11.0
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Message #49 received at 34341 <at> debbugs.gnu.org (full text, mbox):
> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: npostavs <at> gmail.com, l.charignon <at> gmail.com, 34341 <at> debbugs.gnu.org
> Date: Sun, 12 May 2019 16:55:21 +0200
>
> >>>>> On Sun, 12 May 2019 17:02:56 +0300, Eli Zaretskii <eliz <at> gnu.org> said:
> >> That patch to src/gnutls.c fixes my testcase, which is imap
> >> over TLS1.3 to gmail. Itʼs pretty simple, I think it could go
> >> to emacs-26. Eli?
>
> Eli> Didn't I already answer that? If not, I guess you are now
> Eli> talking about some patch which I didn't see, so please show
> Eli> it.
>
> >From 6d5f5670443f7adfbd6993173ad997ce25827775 Mon Sep 17 00:00:00 2001
> From: Noam Postavsky <npostavs <at> gmail.com>
> Date: Mon, 6 May 2019 19:55:17 -0400
> Subject: [PATCH] Handle GNUTLS_E_AGAIN in emacs_gnutls_read (Bug#34341)
>
> * src/gnutls.c (emacs_gnutls_read): Similar to emacs_gnutls_write,
> when gnutls_record_recv returns GNUTLS_E_AGAIN set errno to EGAIN.
I definitely said it was okay to push that one to emacs-26:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341#34
Thanks.
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(Sun, 12 May 2019 15:40:02 GMT)
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Message #52 received at 34341 <at> debbugs.gnu.org (full text, mbox):
>>>>> On Sun, 12 May 2019 18:23:19 +0300, Eli Zaretskii <eliz <at> gnu.org> said:
>> From: Robert Pluim <rpluim <at> gmail.com> Cc: npostavs <at> gmail.com,
>> l.charignon <at> gmail.com, 34341 <at> debbugs.gnu.org Date: Sun, 12 May
>> 2019 16:55:21 +0200
>>
>> >>>>> On Sun, 12 May 2019 17:02:56 +0300, Eli Zaretskii
>> <eliz <at> gnu.org> said: >> That patch to src/gnutls.c fixes my
>> testcase, which is imap >> over TLS1.3 to gmail. Itʼs pretty
>> simple, I think it could go >> to emacs-26. Eli?
>>
Eli> Didn't I already answer that? If not, I guess you are now
Eli> talking about some patch which I didn't see, so please show
Eli> it.
>>
>> >From 6d5f5670443f7adfbd6993173ad997ce25827775 Mon Sep 17
>> 00:00:00 2001 From: Noam Postavsky <npostavs <at> gmail.com> Date:
>> Mon, 6 May 2019 19:55:17 -0400 Subject: [PATCH] Handle
>> GNUTLS_E_AGAIN in emacs_gnutls_read (Bug#34341)
>>
>> * src/gnutls.c (emacs_gnutls_read): Similar to
>> emacs_gnutls_write, when gnutls_record_recv returns
>> GNUTLS_E_AGAIN set errno to EGAIN.
Eli> I definitely said it was okay to push that one to emacs-26:
Eli> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341#34
So you did, I missed that one.
Robert
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Message #55 received at 34341 <at> debbugs.gnu.org (full text, mbox):
> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: npostavs <at> gmail.com, 34341 <at> debbugs.gnu.org, l.charignon <at> gmail.com
> Date: Sun, 12 May 2019 17:39:28 +0200
>
>
> Eli> I definitely said it was okay to push that one to emacs-26:
>
> Eli> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341#34
>
> So you did, I missed that one.
No sweat.
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Message #58 received at 34341 <at> debbugs.gnu.org (full text, mbox):
tags 34341 fixed
close 34341 26.3
quit
Robert Pluim <rpluim <at> gmail.com> writes:
> Noam> I found this smaller change fixes it also. Is it simple
> Noam> enough to for emacs-26? Otherwise, we should set
> Noam> gnutls-algorithm-priority because (as far as I understand)
> Noam> we have a broken TLS1.3 implementation at the momement.
>
> That patch to src/gnutls.c fixes my testcase, which is imap over
> TLS1.3 to gmail.
Okay, good, it's not just me then. :)
I think this patch is going to get more important over time, as more
people upgrade gnutls versions, and more servers start supporting
TLS1.3.
Pushed to emacs-26.
202ff53da2 2019-05-13T20:15:31-04:00 "Handle GNUTLS_E_AGAIN in emacs_gnutls_read (Bug#34341)"
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=202ff53da267f9fa15f438e9c38603bbead6e890
Added tag(s) fixed.
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bug marked as fixed in version 26.3, send any further explanations to
34341 <at> debbugs.gnu.org and Laurent Charignon <l.charignon <at> gmail.com>
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Forcibly Merged 34341 39158.
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