Core Dumps
From mylearnings
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
