Tag: ulimit

Be careful of thread stack size

Today, my colleague came across a thread stack overflow core dump:

Capture

From above diagram, we can see only this function’s stack will occupy ~7 MiB space. Check the stack size configuration on system:

$ ulimit -S -s
8192

just 8 MiB. Double the stack size:

$ ulimit -S -s 16384

The program won’t crash.

Reference:
General: How do I change my default limits for stack size, core file size, etc.?.

 

Enable generating core dump file on Debian Linux

The default core dump file size is 0 on Debian Linux:

$ ulimit -c
0

To enable generating core dump file, I need to run following command:

$ ulimit -c unlimited

But if you re-login, the core dump file size is changed back to 0 from unlimited. So “ulimit -c unlimited” need to be executed during your login. E.g., if you use zsh, append it in .zshrc file.