Re: [PATCH] kernel/exit: do panic earlier to get coredump if global init task exit

[Oleg Nesterov]

On 12/12, qiwuchen55@xxxxxxxxx wrote:
>
> Of course testing signal_group_exit() is not sufficient. It is still
> possible that this is someone calling exit(2)

Or execve(), so

> @@ -785,6 +781,9 @@ void __noreturn do_exit(long code)
>  		panic("Aiee, killing interrupt handler!");
>  	if (unlikely(!tsk->pid))
>  		panic("Attempted to kill the idle task!");
> +	if (unlikely(is_global_init(tsk) &&
> +		(signal_group_exit(tsk->signal) || thread_group_empty(tsk))))
> +		panic("Attempted to kill init! exitcode=0x%08lx\n", code);

so this can panic() if one of init's threads does does exec.

Oleg.