Core Dumps: Difference between revisions
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* A core dump can be used to analyze the reason for the crash. | * A core dump can be used to analyze the reason for the crash. | ||
* A core can come from User space programs or even kernel. | * 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 | ::- 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 note 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. | * 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 | ::- In linux this is done using Kdump/Kexec | ||
Latest revision as of 03:42, 2 July 2025
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 note 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
