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<== Date ==> <== Thread ==>

Subject: Linux scan thread suspended
From: Pilar Gil Jaldo <pilar.gil@sevensols.com>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Wed, 5 Sep 2018 15:36:01 +0200
Hello everybody,

I have a question regarding the reasons why a scan thread can be suspended. I have a running IOC and at a certain moment the IOC breaks with following message:

epicsStrDup: mallocMustSucceed(1) - malloc failed
Thread scan2 (0x9c2b038) suspending.

I have found in the tech-talk messages following reason which seems to be the same problem that mine.

https://epics.anl.gov/tech-talk/2013/msg00154.php

The IOC is on a network where many devices are sending packages to the CA network, but nobody is answering because other devices are switched off (the traffic in the CA is very high).

Is it possible that the segmentation fault is caused by a network congestion? Can the scan thread be suspended by a higher network traffic?

Thank you very much in advance for your answers.
Pilar Gil Jaldo

Replies:
RE: Linux scan thread suspended Mark Rivers

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