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When using `setsid()` in a child process created by `fork()`, a new session is created, and the child becomes a session leader. If the parent process terminates before the child, the child becomes an orphan and is adopted by the `init` process. The `init` process will eventually clean up the child process once it exits. However, killing the parent does not automatically kill the child; the child will continue running until it exits. Proper cleanup involves waiting for the child process to exit using `wait()` or `waitpid()` in the parent process to avoid zombie processes, but this approach is not valid for `EXECUTE_COMMAND_LINE` with async mode. Fix: https://github.com/llvm/llvm-project/issues/77803