Core dumps aren't generated in El Captain I used ulimit -c unlimted in terminal to get core dumps in the /cores folder.
However, after reboot (kernel panic) I no longer can get any core dumps regardless what I try - ulimit -c unlimted or sudo sysctl -w kern.coredump=1 - core dumps just don't get generated.

How should I enable core dumps for the terminal session? I used core dumps to debug my console application. 

OSX 10.11.5
The issue was missing sticky bit on the /cores directory permissions:

$ ls -lh /
...
drwxr-xr-x    2 root  admin    68B Jul 29 09:55 cores/
...


fixed by:

sudo chmod 1775 /cores