Re: Possible race condition in oom-killer

[Tetsuo Handa]

Michal Hocko wrote:
>                       Once we merge [1] then the oom victim wouldn't
> need to get TIF_MEMDIE to access memory reserves.
> 
> [1] http://lkml.kernel.org/r/20170727090357.3205-2-mhocko@xxxxxxxxxx

False. We are not setting oom_mm to all thread groups (!CLONE_THREAD) sharing
that mm (CLONE_VM). Thus, one thread from each thread group sharing that mm
will have to call out_of_memory() in order to set oom_mm, and they will find
task_will_free_mem() returning false due to MMF_OOM_SKIP already set, and
after all goes to next OOM victim selection.