On Mon 20-07-20 21:01:27, Yafang Shao wrote:
> When the OOM killer finding a victim and trying to kill it, if the victim
> is already exiting, the task mm will be NULL and no process will be killed.
> But the dump_header() has been already executed, so it will be strange to
> dump so many information without killing a process. We'd better show some
> helpful information to indicate why this happens.
>
> Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
> Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Cc: Qian Cai <cai@xxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Thanks!
> ---
> v1 -> v2:
> - improve the output, per Tetsuo and Michal
> ---
> mm/oom_kill.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> index 6e94962893ee..c176c988c109 100644
> --- a/mm/oom_kill.c
> +++ b/mm/oom_kill.c
> @@ -863,6 +863,8 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
>
> p = find_lock_task_mm(victim);
> if (!p) {
> + pr_info("%s: OOM victim %d (%s) is already exiting. Skip killing the task\n",
> + message, task_pid_nr(victim), victim->comm);
> put_task_struct(victim);
> return;
> } else if (victim != p) {
> --
> 2.18.1
--
Michal Hocko
SUSE Labs
