[Pkg-haskell-maintainers] Bug#728584: Bug#728584: cabal-install hangs

张增波 zengbo.zhang at gmail.com
Sat Nov 9 09:05:38 UTC 2013

Dear Joachim and all mentainers:

   I have more information on this bug. When I changed ~/.cabal/config file
to use

  remote-repo: old.hackage.haskell.org:http://old.hackage.haskell.org/

instead of

  remote-repo: hackage.haskell.org:http://

cabal update successed; When I changed back to default, the issue is then
reproducable again.

In both case, proxychains cabal update will get segmentation fault.

Hope it helps.



2013/11/4 张增波 <zengbo.zhang at gmail.com>

> HI Joachim and all,
> I guess two situations may help to reproduce it:
> 1. I am behind two NATs, one is a home router, one is the connection point
> from ISP to Internet (maybe more, depends on ISP).
> 2. The network speed is slow from my pc to hackage server (about 10KB/s)
> And there is another phenomenon after I reported the bug: I tried again (3
> times) to do cabal update, with two times get partial content (almost full,
> let me say, only ~200k lost compared to a wget-ed and verified version but
> I didn't record the number ) after about 10 minutes then it reported the
> tarball is broken; and the last time it hangs with 3 hours so I did Ctrl-C
> to exit (same as the bug report itself).  If you need I can do more times
> and give some accurate data (time/size).
> From the new phenomenon, I guess again it is about a weak design of tcp
> itself: when there is only one direction of data flow, the sender may close
> the tcp link more quickly than the receiver at certain condition: for some
> point the sender lose all data packages (and re-transmissions) to the
> receiver, and the receiver don't know it at all.  Although it is a tcp
> weakness, AFAIK, this should be overcome by some upper layer protocol
> implementation.
> And another thing I am surprised is about proxychains, it is 100%
> segmentation fault on my side. I just use a ssh dynamic port forwarding and
> in wget case it can speed up the download to hackage server. It should be
> easy to reproduce in my opinion.
> Best,
> Zengbo
> 2013/11/4 Joachim Breitner <nomeata at debian.org>
>> Hi,
>> Am Sonntag, den 03.11.2013, 19:41 +0800 schrieb Zhang Zengbo:
>> > I am a new user of haskell-platform. After I installed it, I simply run:
>> > cabal update, it hangs, then I try to use --verbose=3 to see what
>> happend:
>> unfortuately, I cannot reproduce it here. Is there anything special
>> about your network setup? E.g. forced proxies or something of the kind?
>> Greetings,
>> Joachim
>> --
>> Joachim "nomeata" Breitner
>> Debian Developer
>>   nomeata at debian.org | ICQ# 74513189 | GPG-Keyid: 4743206C
>>   JID: nomeata at joachim-breitner.de | http://people.debian.org/~nomeata
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