Ubuntu 15.10 core files not found although core_pattern looks ok

Question

On Ubuntu 15.10 I can not find the core files dumped by my program. ulimit is set to unlimited. After uninstalling the apport service, the /proc/sys/kernel/core_pattern file only contains core which should just create a file called core in the same directory of my failing executable. Unfortunately that's not the case.

Answer 1

the solution was to set ulimit -c unlimited

Here is my full solution that puts all the core files in /tmp/cores with an explicit name for those files:

sudo apt-get remove apport
ulimit -u unlimited
sudo bash -c 'echo "* hard core unlimited" >> /etc/security/limits.conf'
sudo bash -c 'echo "* soft core unlimited" >> /etc/security/limits.conf'
sudo bash -c 'echo "kernel.core_pattern=/tmp/cores/core.%e.%p.%h.%t" >> /etc/sysctl.conf'
sudo sysctl -p /etc/sysctl.conf

Then you need to logout or reboot to make it all work.