Tcp connect failing since upgrade to 8.15 on termux

Questions & Answers
1

I ran into this error when running raco pkg migrate 8.14. Can someone help me figure out what's going on? I can visit the host through a browser on my device. I don't have a VPN or proxy or anything. I'm on termux on Android if that matters. With racket bc.

11: Resolving "scribble-lib" via https://download.racket-lang.org/releases/8.15/catalog/
12: Resolving "threading-lib" via https://download.racket-lang.org/releases/8.15/catalog/
tcp-connect: connection failed;
 host not found
  address: download.racket-lang.org
  port number: 443
  system error: Invalid value for ai_flags; gai_err=3
  context...:
   /data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
   /data/data/com.termux/files/usr/share/racket/collects/net/http-client.rkt:67:0: http-conn-open!
   /data/data/com.termux/files/usr/share/racket/collects/net/http-client.rkt:274:0
   /data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
   /data/data/com.termux/files/usr/share/racket/collects/net/url.rkt:201:0: http://getpost-impure-port
   /data/data/com.termux/files/usr/share/racket/collects/net/url.rkt:309:2: redirection-loop
   /data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/network.rkt:59:3
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/network.rkt:33:4
   /data/data/com.termux/files/usr/share/racket/collects/racket/private/more-scheme.rkt:206:2: call-handled-body
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/catalog.rkt:138:9: for-loop
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/catalog.rkt:135:2: lookup-normally
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:129:4
   /data/data/com.termux/files/usr/share/racket/collects/racket/private/more-scheme.rkt:206:2: call-handled-body
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:128:2
   /data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:172:7
2

Wondering if it's related to this recent change which I see mentioned here: Release Announcement for v8.15 - #21 by shhyou

3

I didn't get this bug when migrating on a different machine in my network. So I don't think it's network conditions. That was a Linux desktop

4

Tcp connect is failing on my machine. Here's some output when trying to set up a basic connection.

> (tcp-connect "google.com" 443)
tcp-connect: connection failed;
 host not found
  address: google.com
  port number: 443
  system error: Invalid value for ai_flags; gai_err=3
  context...:
   instantiate
   eval-one-top
> (tcp-connect "google.com" 80)
tcp-connect: connection failed;
 host not found
  address: google.com
  port number: 80
  system error: Invalid value for ai_flags; gai_err=3
  context...:
   instantiate
   eval-one-top
5

It does look like rktio: use `AI_V4MAPPED` and `AI_ADDRCONFIG` · racket/racket@3acb5b3 · GitHub is causing trouble for Android. Are you building Racket from source, so that you could try removing those lines?

6

No, I'm not. And it's not something I'm likely to do either. Termux distributes bc which I don't think my device is powerful enough to build, and for some reason cs has a very long startup time on my device. Like 15s.

7

It looks like non-support for AI_V4MAPPED on Android is a common problem, and I've pushed a repair (hopefully) as rktio: avoid `AI_V4MAPPED` on Android · racket/racket@78fbcab · GitHub. Maybe someone responsible for the Racket package on Termux could try that patch.

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