On Tue 09-08-22 18:57:14, Andrew Morton wrote: > On Tue, 9 Aug 2022 20:16:43 +0530 Charan Teja Kalla <quic_charante@xxxxxxxxxxx> wrote: > > > The below is one path where race between page_ext and offline of the > > respective memory blocks will cause use-after-free on the access of > > page_ext structure. > > Has this race ever been observed at runtime? > > Given the size of the fix, I'm looking for excuses to not backport it > into -stable kernels! I believe this is quite theoretical for two reasons 1) the memory hotplug (offlining) is quite rare operation 2) with all the retries the race window is quite hard to trigger So this is good to have address long term but nothing really for stable until somebody actually hits that with a real world workload. Btw. I plan to have a look and review this but times are busy. Hopefully soon. Thanks! -- Michal Hocko SUSE Labs
