openssh bugs - Apr 2016 - [Bug 2000] when using ssh with ControlMaster/ControlPersist, one may get zombie processes

https://bugzilla.mindrot.org/show_bug.cgi?id=2000

--- Comment #8 from Christoph Anton Mitterer <calestyo at scientia.net>
---
Uhm? Well I thought that was obvious... using SSH to remotely execute
checks seems desirable because it's a) the protocol meant for doing
this b) secure (unlike e.g. NRPE).

But without control channel muxing, it's much slower than e.g. NRPE, as
all the auth/kex/etc. needs to be done again for every connection,
which doesn't scale when you run n checks per host...
ssh with control muxing is howver basically as fast as NRPE.

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