Does executing an int 3 interrupt stop the entire process on Linux or just the current thread?

Question

Suppose the architecture is x86. And the OS is Linux based. Given a multithreaded process in which a single thread executes an int 3 instruction, does the inter

Answer 1

int 3 is a privileged instruction that userspace code is not allowed to run.

The kernel will then send a SIGTRAP signal to your process, and the default action for a SIGTRAP signal is to terminate the entire process.