Re: [PATCH 1/2] mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()

[Tejun Heo]

Hello,

On Thu, Nov 07, 2019 at 01:21:25PM +0100, Michal Hocko wrote:
> Hmm, how can we have a task in an offline memcg? I thought that any
> existing task will prevent cgroup removal from proceeding. Is this some
> sort of race where the task managed to disassociate from the cgroup
> while there is still a binding to a memcg existing? What am I missing?

The previous cgroup one was from bsd process accounting which happens
after the process is marked head.  This one IIUC is from core dumping
path.

Thanks.

-- 
tejun