On 12.04.2016 19:34, Vladimir Davydov wrote:
> Otherwise, we might end up selecting the same process over and over
> again in case it got stuck somewhere in exit path for some reason.
> 
> Signed-off-by: Vladimir Davydov <[email protected]>
> ---
>  mm/oom_kill.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 2402fcceda6e..b21641ff508e 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -847,6 +847,9 @@ void oom_kill_process(struct task_struct *p, gfp_t 
> gfp_mask, int order,
>  
>                       if (child->mm == p->mm)
>                               continue;
> +                     if (!child->mm ||

This check works only if p is kthreadadd_task, and it seems it's never valid. 
It's not a problem,
just a note.

> +                         test_tsk_thread_flag(child, TIF_MEMDIE))
> +                             continue;
>                       /*
>                        * oom_badness() returns 0 if the thread is unkillable
>                        */
> 
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