Experimental Physics and Industrial Control System
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Hello Mark,
Thank you for your reply. I'm going to give a little bit more
information about the system.
It is a 64 bit machine running EPICS 3.13.7 with..
total used free shared
buffers cached
Mem: 7812 700 7112 0
49 410
I was speculating with a network problem because I have the same
system with the same configuration running outside the network and
I have never seen this error before. This error is just happing
since the other devices are requesting messages to the CA Network
without getting an answer from the offline devices.
The possibility of a non zero terminated string would be also
strange because in the other running system everything is working
fine.
Thank you very much in advance!
Pilar
On 05/09/18 16:02, Mark Rivers wrote:
Hi Pilar,
I think your case is different from the tech-talk thread. In the tech-talk thread they said there was no IOC error mesage, but in your case you have a very clear IOC error message:
epicsStrDup: mallocMustSucceed(1) - malloc failed Thread scan2 (0x9c2b038) suspending.
This says to me that your IOC has run out of memory. I suspect there is a memory leak somewhere.
Is this a 32 or 64 bit machine, and how much memory does it have?
You could restart the IOC and use "top" to look at the memory usage with time.
What version of EPICS are you using, and what devices does this IOC control?
Mark
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Pilar Gil Jaldo
Sent: Wednesday, September 5, 2018 8:36 AM
To: [email protected]
Subject: Linux scan thread suspended
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
--
Pilar Gil Jaldo
Embedded SW Engineer
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