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tramp ControlMaster options (was: Re: package.el: what does package "Che

From: Yuri D'Elia
Subject: tramp ControlMaster options (was: Re: package.el: what does package "Checking ... " actually do?)
Date: Sat, 18 Jul 2015 14:44:11 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.0

On 18/07/15 13:22, Yuri D'Elia wrote:
> On 17/07/15 13:11, Yuri D'Elia wrote:
>> When I'm using a high-latency network connection, and I update some
>> packages, downloading takes a few seconds after the connection is
>> initiated, but package "Checking" instead takes literally minutes to
>> complete.
> Turns out, it's another case of:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20015

It's really that bad. Even bringing out the variable description of
tramp-ssh-controlmaster-options hangs.

The issue is caused by a rogue provider's DNS server responding with
NXDOMAIN but valid IN A record, which ssh still tries to connect to. And
since the host is filtered, this takes minutes to time out.

Considering that I have a global setting in my ~/.ssh/config that
enables ControlMaster/ControlPath globally, I consider this as a regression.

I tried the same probes using:

  ssh -o BatchMode=yes [various flags]

and I get comparable output, and there's no chance would be a
valid address.

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