Re: [PATCH 2/2] memcg: Close the race between migration and installing bprm->mm as mm

[Oleg Nesterov]

On 05/04, Eric W. Biederman wrote:
>
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1044,6 +1044,8 @@ static int exec_mmap(struct mm_struct *mm)
>  		return 0;
>  	}
>  	mmdrop(active_mm);
> +	/* The tsk may have migrated before the new mm was attached */
> +	mm_sync_memcg_from_task(tsk);
>  	return 0;
>  }

call_usermodehelper(). perhaps it makes sense to change flush_old_exec()
to clear PF_KTHREAD/etc before exec_mmap().

Oleg.