[tor-bugs] #25600 [Obfuscation/Snowflake]: Running 2 instances of snowflake-client leads to the former one stopping

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#25600: Running 2 instances of snowflake-client leads to the former one stopping
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 Reporter:  cypherpunks            |          Owner:  (none)
     Type:  defect                 |         Status:  new
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by dcf):

 Thanks for this.

 I tried it, but I wasn't able to reproduce it. On Debian, I used a browser
 from https://people.torproject.org/~dcf/pt-
 bundle/snowflake/20180321-8.0a4-4a5889af2891/ and a command line
 snowflake-client from [https://gitweb.torproject.org/pluggable-
 transports/snowflake.git/log/?id=07291a0136b8a01bd8761a14a51876f08ca0d578
 07291a0136].
  1. Started a download of
 https://mirrors.edge.kernel.org/centos/7.4.1708/isos/x86_64/CentOS-7-x86_64-Everything-1708.iso.
 Was getting about 400 KB/s.
  2. In the snowflake/client directory, ran `tor -f torrc SOCKSPort 10000`.
 It finished bootstrapping and the Browser download was still running.
  3. Download through the command-line client: `curl -O --proxy
 socks5h://127.0.0.1:10000/
 https://mirrors.edge.kernel.org/centos/7.4.1708/isos/x86_64/CentOS-7-x86_64-Everything-1708.iso`.
 I was getting about 500 KB/s on this download and the browser was still
 about 400 KB/s.

 Maybe it was a coincidence that one of the clients died when the other one
 started? I'm currently testing some proxy changes from
 comment:63:ticket:21312, and it seems there is still a problem with
 proxies hanging up occasionally. Does it happen for you repeatedly?

 Or, there could be some weird interaction, like maybe it only happens when
 both of the clients are using the same proxy instance.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25600#comment:2>
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