[Gllug] SSH ControlMaster

[Minty]

I've got this in .ssh/config

ControlPath ~/.ssh/master-%r@%h:%p
ControlMaster auto

which typically works a charm.

However from time to time a subsequent connection that is trying to
re-use an existing master manages to hang all connections to that
host.

tab1
  ssh remote_host # works
tab2
  ssh remote_host # connects super fast
tab ?
  ssh remote_host # never connects, all existing connections are frozen/hung

Hitting Ctrl+C on the most recent (hung) connection takes all the
existing connections with it.

I've been able to find no rhyme or reason for what causes it or how to
cure it, or even just to stop the newest connection without
simultaneously taking all the existing ones as well.
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