Re: [PATCH] oom: avoid killing init if it assume the oom killedthread's mm

From: David Rientjes
Date: Tue Sep 24 2013 - 22:35:03 EST

On Mon, 23 Sep 2013, Ming Liu wrote:

> After selecting a task to kill, the oom killer iterates all processes and
> kills all other user threads that share the same mm_struct in different
> thread groups.
> But in some extreme cases, the selected task happens to be a vfork child
> of init process sharing the same mm_struct with it, which causes kernel
> panic on init getting killed. This panic is observed in a busybox shell
> that busybox itself is init, with a kthread keeps consuming memories.

We shouldn't be selecting a process where mm == init_mm in the first
place, so this wouldn't fix the issue entirely.
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