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<== Date ==> <== Thread ==>
Subject: Weird CAS hangup on IOC
From: Ralph Lange via Core-talk <core-talk at aps.anl.gov>
To: EPICS Core Talk <core-talk at aps.anl.gov>
Date: Thu, 6 Feb 2020 13:16:03 +0100
Dear Core-talkers,

We have been seeing an IOC lately that occasionally seems to boot fine, does not print the usual "cas warning: Configured TCP port was unavailable. [...]" messages for not being the first one on the host, but then emits a
CAS: Listen error: Address already in use
Thread CAS-TCP (0x3337a20) suspended
and becomes CA unresponsive.

We recently changed our IOC startup to be systemd controlled and are starting all IOCs in parallel.
Question: Is there a vulnerability for a race condition where two IOCs are under the impression of being able to use the original CA port, but one of them eventually fails to listen()?

Cheers,
~Ralph

Replies:
Re: Weird CAS hangup on IOC Torsten Bögershausen via Core-talk
Re: Weird CAS hangup on IOC Michael Davidsaver via Core-talk
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