Re: + memcg-do-not-report-racy-no-eligible-oom-tasks.patch added to -mm tree

[Andrew Morton]

On Fri, 25 Jan 2019 18:24:16 +0100 Michal Hocko <mhocko@xxxxxxxxxx> wrote:

> > >     out_of_memory
> > >       select_bad_process # no task
> > > 
> > > If Thread1 didn't race it would bail out from try_charge and force the
> > > charge.  We can achieve the same by checking tsk_is_oom_victim inside the
> > > oom_lock and therefore close the race.
> > > 
> > > [1] http://lkml.kernel.org/r/bb2074c0-34fe-8c2c-1c7d-db71338f1e7f@xxxxxxxxxxxxxxxxxxx
> > > Link: http://lkml.kernel.org/r/20190107143802.16847-3-mhocko@xxxxxxxxxx
> > > Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
> > > Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> > > Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> > > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> > 
> > It looks like this problem is happening in production systems:
> > 
> > https://www.spinics.net/lists/cgroups/msg21268.html
> > 
> > where the threads don't exit because they are trapped writing out the
> > oom messages to a slow console (running the reproducer from this email
> > thread triggers the oom flooding).
> > 
> > So IMO we should put this into 5.0 and add:
> 
> Please note that Tetsuo has found out that this will not work with the
> CLONE_VM without CLONE_SIGHAND cases and his http://lkml.kernel.org/r/01370f70-e1f6-ebe4-b95e-0df21a0bc15e@xxxxxxxxxxxxxxxxxxx
> should handle this case as well. I've only had objections to the
> changelog but other than that the patch looked sensible to me.

So I think you're saying that 

mm-oom-marks-all-killed-tasks-as-oom-victims.patch
and
memcg-do-not-report-racy-no-eligible-oom-tasks.patch

should be dropped and that "[PATCH v2] memcg: killed threads should not
invoke memcg OOM killer" should be redone with some changelog
alterations and should be merged instead?