[SOLVED] core file not created on a segmentation fault on ARM

Issue

I have an ARM executable[ (Debug build) ELF 32 bit LSB executable, ARM version (SYSV)] process executing on ARM Cortex A9 target having Linux OS(KErnel 2.6.38.8 )

The process has user id root, groupid root.

Even when the process crashes after getting SIGSEGV, there is no core file generated. Now I have read this question to ensure that the file system is writable, ulimit -c is unlimited, user is root and has permissions, but still, something is missing.

Here are a few outputs of certain variables of my process and system, related to a core file creation:

cat /proc//coredump_filter is 00000033

cat /proc/sys/kernel/core_pattern is core

cat /proc/sys/kernel/core_uses_pid is 0

I have tried everything but am stumped.

Could there be any kernel config/build option disabling the core creation?

Any other pointers?

EDIT: I did simple test as below and it created a core file, but my process crash still does not dump core file.

sleep 20 &
killall -SIGSEGV sleep

Solution

Could there be any kernel config/build option disabling the core creation?

It is hidden under General Setup|Embedded System or General Setup|Configure standard... depending on your Linux version. The symbol value is ELF_CORE and it is in init/Kconfig. If it is not enabled, you will never get core dumps.

As suggested in a hidden comment in why coredump file is not generated.

Answered By - artless noise

Answer Checked By - Pedro (WPSolving Volunteer)