View source for Core Dumps

= What is a Core Dump ? =
* A core dump is a snapshot of the programs memory mappings and state when it crashed.
* A core dump can be used to analyze the reason for the crash.
* A core can come from User space programs or even kernel.
::- Core get generated when the user space program receives certain signal like (For detail check '''''man 7 signal''''')
::- For a core to get dumped properly (without any truncation/corruption), limits of the process need to be set properly using ulimit(if bash is used).
::- '''ulimit -a''' => To check the limit (For details check '''''man bash''''' as '''ulimit''' is a builtin command)
::- As a side not we can see all the builtin commands by typing '''''help''''' in bash.
* Kernel is having special mechanism for booting a secondary kernel and collect the core for primary kernal.
::- In linux this is done using Kdump/Kexec