Linux Core files are not generated even after changing ulimit

One of our Oracle SOA servers were crashing lately and Oracle requested for core dumps to analyze issue further. In hotspot crash report, following message is written:

Not able to take core dump as core file size is set to zero.

Below are steps followed to generate core dumps on JVM crash:

Step 1: Increased ulimit using following command: ulimit -c unlimited > /dev/null 2>&1

Step 2: Restarted server. But no luck, still no core dumps are generated. It was not effective as it is applicable to only for the current shell session and not to new shell session.

Step 3: Updated the value in .bashrc file ‘ulimit -c unlimited > /dev/null 2>&1′ . This made all new sessions’ ulimit to new value. Again started soa server, still ulimit value for core dump file size is zero.

Step 4: This was not expected. On analysis found that, soa server is taking its ulimit values from its parent process which is node manager process as server was started via node manager. Restarted node manager and soa servers, new values were reflected.

It was one of those days where there were no other burning issues and got time go to root of the problem. Otherwise, it would have been tagged as “Restart of the complete domain will resolve most of the problems !!!”

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