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SubjectRe: Possible race condition in oom-killer
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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@kernel.org

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.

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