Why Coredump files is not generating here?

Question

I have a sitution here,few days back I was able to see core dumbed file on my target board,I have provided the coredump generation support by adding "ulimit -c unlimited" to my /etc/profile.But then someone told me

This will only take affect for program launched from a login shell, not for processes/services started by systemd,etc/limits would the the proper location for settings these defaults.

So I changed /etc/limits file and added "ulimit -c unlimited" line.but now I could not see Coredumped file

I am running kill -9 $$ to generate segmentation fault and it in turn will generate coredump file as it was doing earlier.

We tried changing "/proc/sys/kernel/core_pattern" file and running ulimit -c unlimited explicitly also but its not working out too

Where we are doing wrong??

Solution 1

kill -9 will not generate a core file. The command kill -l gives a list of supported signals. kill -6 or kill -SIGABRT should produce a core file. As well as most other signals such as kill -BUS, kill -SEGV, etc.

Solution 2

kill -11 always works for me. 11 is SIGSEGV (invalid memory reference)

Solution 3

You have to first off enable user limits settings to ensure that core files can be created.

ulimit -c unlimited

Application user must run as and before you start the application in the same session. This setting is inherited by the application, so what ever the ulimit is set as before starting the application is what the ulimit setting will be for the application (unless a start script changes it).