Re: Patch "coredump: fix race condition between mmget_not_zero()/get_task_mm() and core dumping" has been added to the 4.4-stable tree

On Wed, 2019-06-05 at 08:50 +0200, Michal Hocko wrote:

On Tue 04-06-19 16:51:38, Ben Hutchings wrote: [...]

...

• I don't understand why collapse_huge_range() needs to be fixed, but

then I really don't understand the khugepaged code at all!  So I would trust Michal on this.

To be honest, I am not really sure myself here. But we are using a remote mm there and I do not see anything that would prevent from racing with exit/coredump. Maybe I am wrong. Let's wait for Andrea for his review feedback. This patch is quite tricky for the stable backport.

So, Greg, it seems like you should drop this from the current stable round.

Ben.