How to dump information into a file when your process is crashed

How does you system dump crash information>

cat /proc/sys/kernel/core_pattern
|/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -F%F -- %

In this case, it sends crash information into Apport for automated crash reporting and analysis, rather than leaving a plain binary file.

sudo sysctl -w kernel.core_pattern=core

writes raw core dumps to files named “core”.

If you want to get back the setting, use below command.

sudo sysctl -w kernel.core_pattern='|/usr/share/apport/apport -p%p -s%s -c%c -d%d -P%P -u%u -g%g -F%F -- %E'

gdb /path/to/program core

/path/to/program: crashed executed program

core : generated core file

bt → Backtrace (the call stack at the time of the crash)
info locals → View local variables
list → Display the corresponding source code lines (if debugging information is available)