# Pack\_list\_installed? **URL:** \ **Category:** Tools\ **Tags:** bug\ **Created:** [December 17, 2024, 6:32am UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677 "2024-12-17T06:32:51Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\ **Post date:** [December 17, 2024, 6:32am UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/1 "2024-12-17T06:32:51Z")
This morning I was after updating clpBNR to the last release, and started by ```prolog ?- pack_list_installed. % Contacting server at https://www.swi-prolog.org/pack/query ... Waiting for Prolog. Close again to force termination .. ``` The predicate stopped, hitting Ctrl-C didn’t produced any effect. The message ‘Waiting…’ showed after when I tried to close the console (swipl-win.exe) using the upper right X button. It’s still there, I must use Windows Task Manager to kill the process… **Edit** The same problem occurs with ```prolog ?- pack_upgrade(clpBNR). % Contacting server at https://www.swi-prolog.org/pack/query .. ``` **Edit** Could the cause be that [https://ridgeworks.github.io/clpBNR/](https://ridgeworks.github.io/clpBNR/) causes a 404 on github ? I pinged that url looking for the latest deployment… ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 17, 2024, 8:37am UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/2 "2024-12-17T08:37:18Z")
Seems there is something wrong with your connection to [www.swi-prolog.org](http://www.swi-prolog.org). As that is on a CDN, the most likely seems some network issue on your site. If I recall correctly, the contact is written as ``` setup_call_cleanup( http_open(....), ... ``` That is still somewhat problematic as the _setup_ part of setup\_call\_cleanup/3 is executed using sig\_atomic/1 to avoid interrupts leading to a partial initialization and resource leaks. ---
**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\ **Post date:** [December 17, 2024, 9:16am UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/3 "2024-12-17T09:16:21Z")
> [@jan](#): > > something wrong with your connection It used to work, and my job is (mainly) on Internet, obviously working… but you’re right that ```prolog ?- http_open('https://www.swi-prolog.org/',S,[]),stream_info(S),close(S). Correct to: "http_open:http_open('https://www.swi-prolog.org/',S,[])"? yes ``` hangs forever, as well… maybe a timeout(60) - just to say - in pack\_… functions accessing Internet could be more user friendly. Well, since I don’t know what I could try to overcome the connection problem, I’ve cloned locally [GitHub - ridgeworks/clpBNR: CLP(BNR) module for SWI-Prolog](https://github.com/ridgeworks/clpBNR.git), and will try to upgrade from there. Thanks ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 17, 2024, 12:33pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/4 "2024-12-17T12:33:51Z")
> [@CapelliC](#): > > hangs forever, as well… maybe a timeout(60) - just to say - in pack\_… functions accessing Internet could be more user friendly. Eventually, the low level network stuff should time out. What is more interesting is why this happens? Can your browser connect to [www.swi-prolog.org](http://www.swi-prolog.org)? Could it be a firewall issue that blocks swipl.exe from accessing the network? Could there be a proxy that is not understood? You can try ``` ?- debug(http(_)). ?- http_open('https://www.swi-prolog.org/',S,[]). ``` and see what it is trying to do. ---
**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\ **Post date:** [December 17, 2024, 2:14pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/5 "2024-12-17T14:14:53Z")
> [@jan](#): > > Can your browser connect to [www.swi-prolog.org](http://www.swi-prolog.org)? yes, it can. > [@jan](#): > > Could it be a firewall issue that blocks swipl.exe from accessing the network? Don’t know… from long time I switched to my phone hotspot instead of a wired connection, so I’m pretty sure pack\_install etc were working some time ago. > [@jan](#): > > Could there be a proxy that is not understood? Maybe this, because ```prolog PS C:\Users\cccar> ping https://www.swi-prolog.org/ Impossibile trovare l'host https://www.swi-prolog.org/. Verificare che il nome sia corretto e riprovare. Esecuzione di Ping www.google.com [216.58.204.228] con 32 byte di dati: Risposta da 216.58.204.228: byte=32 durata=61ms TTL=113 Risposta da 216.58.204.228: byte=32 durata=46ms TTL=113 Risposta da 216.58.204.228: byte=32 durata=54ms TTL=113 Risposta da 216.58.204.228: byte=32 durata=62ms TTL=113 Statistiche Ping per 216.58.204.228: Pacchetti: Trasmessi = 4, Ricevuti = 4, Persi = 0 (0% persi), Tempo approssimativo percorsi andata/ritorno in millisecondi: Minimo = 46ms, Massimo = 62ms, Medio = 55ms ``` Seems a Windows problem with the DNS … If I run from WSL (Ubuntu) I got the same error. ```prolog carlo@acer17:~$ ping https://www.swi-prolog.org ping: https://www.swi-prolog.org: Name or service not known ``` but is really strange is that if - in WSL - I launch swipl-win - built from source some time ago - i got ```prolog - pack_install(clpBNR). % Contacting server at https://www.swi-prolog.org/pack/query ... ok Install clpBNR@0.11.10 from GIT at https://github.com/ridgeworks/clpBNR.git Y/n? ``` > [@jan](#): > > see what it is trying to do Doesn’t seem very useful: ```prolog ?- http_open('https://www.swi-prolog.org/',S,[]). % http_open: Connecting to 'www.swi-prolog.org':443 ... % ok (000002295502d1c0) ---> (000002295502dd70) ``` ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 17, 2024, 2:38pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/6 "2024-12-17T14:38:15Z")
> [@CapelliC](#): > > ```prolog > ping https://www.swi-prolog.org/ > > ``` ping takes a host, i.e., without `https://` > [@CapelliC](#): > > `% Contacting server at https://www.swi-prolog.org/pack/query ... ok` So, it seems your network is fine. > [@CapelliC](#): > > `% ok (000002295502d1c0) ---> (000002295502dd70)` And that is where it ends? That is rather weird. It should continue with the handshake, e.g. ```prolog % http_open: Connecting to 'www.swi-prolog.org':443 ... % ok (0x3513a900) ---> (0x3513aa00) % > GET / HTTP/1.1 % > Host: www.swi-prolog.org % > User-Agent: SWI-Prolog % > Connection: close % HTTP/1.1 200 OK % Connection: close % Content-Length: 3733 % Server: nginx/1.18.0 (Ubuntu) ... S = (0x34f6e000). ``` Anyone else with similar problems (probably on Windows)? Which Prolog version? ---
**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\ **Post date:** [December 17, 2024, 2:52pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/7 "2024-12-17T14:52:19Z")
Prolog version: (yesterday or so daily build) ```prolog Welcome to SWI-Prolog (threaded, 64 bits, version 9.3.16-12-g3c7f96a77) ``` Seems **https** hurts… ```prolog ?- http_open('http://www.swi-prolog.org',S,[]). % http_open: Connecting to 'www.swi-prolog.org':80 ... % ok (000002d13adb0910) ---> (000002d13adafe70) % > GET / HTTP/1.1 % > Host: www.swi-prolog.org % > User-Agent: SWI-Prolog % > Connection: close % HTTP/1.1 301 Moved Permanently ``` But I did a bit of a mess with ping, using different hosts. Now In Windows ```prolog ping www.swi-prolog.org Esecuzione di Ping dualstack.osff2.map.fastly.net [146.75.54.217] con 32 byte di dati: Risposta da 146.75.54.217: byte=32 durata=40ms TTL=55 Risposta da 146.75.54.217: byte=32 durata=41ms TTL=55 ``` ```prolog ping swi-prolog.org Esecuzione di Ping swi-prolog.org [194.164.198.54] con 32 byte di dati: Risposta da 194.164.198.54: byte=32 durata=82ms TTL=48 Risposta da 194.164.198.54: byte=32 durata=93ms TTL=48 ``` In WSL/Ubuntu ````prolog $ ping www.swi-prolog.org PING dualstack.osff2.map.fastly.net (146.75.54.217) 56(84) bytes of data. 64 bytes from 146.75.54.217 (146.75.54.217): icmp_seq=1 ttl=54 time=66.7 ms 64 bytes from 146.75.54.217 (146.75.54.217): icmp_seq=2 ttl=54 time=73.2 ms``` ```` ```prolog $ ping swi-prolog.org PING swi-prolog.org (194.164.198.54) 56(84) bytes of data. 64 bytes from ip194-164-198-54.pbiaas.com (194.164.198.54): icmp_seq=1 ttl=47 time=65.8 ms 64 bytes from ip194-164-198-54.pbiaas.com (194.164.198.54): icmp_seq=2 ttl=47 time=89.0 ms ``` ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 18, 2024, 5:10pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/8 "2024-12-18T17:10:40Z")
It seems SSL\_CTX\_new(), creating a new SSL context simply hangs ☹ Now the big question is why? Well, probably after updating OpenSSL … Normally, this would be spotted, but unfortunately the ssl test suite is disabled as it does not work in the docker build environment ☹ ---
**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\ **Post date:** [December 18, 2024, 5:39pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/9 "2024-12-18T17:39:34Z")
Could be the problem [reported here](https://answers.microsoft.com/en-us/windows/forum/all/openssl-stopped-working-after-october-2024-updates/0cafaf11-af23-4334-a109-5314f76ecb2c) ? I apply routinely every security upgrade M$ proposes, and most probably I haven’t accessed the packs repository from this early summer. I don’t understand the answer, probably will be necessary to replace SSL\_CTX\_new() with SSL\_CTX\_new\_ex()… ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 18, 2024, 7:41pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/10 "2024-12-18T19:41:33Z")
Thanks. I doubt this is the problem though as it hangs rather than retuning an error and the problem also happens when running swipl.exe on Linux under Wine. ---
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [December 19, 2024, 12:03pm UTC](https://swi-prolog.discourse.group/t/pack-list-installed/8677/11 "2024-12-19T12:03:53Z")
Ok. I changed the build docker, replacing the OpenSSL dlls from Fedora 41 mingw-openssl with those from [Win32/Win64 OpenSSL Installer for Windows - Shining Light Productions](https://slproweb.com/products/Win32OpenSSL.html). That fixes the problem. Reported the issue at [2333301 – SSL\_CTX\_new() hangs in CRYPTO\_THREAD\_read\_lock()](https://bugzilla.redhat.com/show_bug.cgi?id=2333301) Will make an announce