* Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> [230328 09:02]: > * Vlastimil Babka <vbabka@xxxxxxx> [230328 05:11]: > > On 3/27/23 21:48, Liam R. Howlett wrote: > > > * Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [230327 15:35]: > > >> On Mon, 27 Mar 2023 14:55:24 -0400 "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx> wrote: > > >> > > >> > These patches have been in -next since next-20230301, and have received > > >> > intensive testing in Android as part of the RCU page fault patchset. > > >> > They were also sent as part of the "Per-VMA locks" v4 patch series. > > >> > Patches 1 to 7 are bug fixes for RCU mode of the tree and patch 8 enables > > >> > RCU mode for the tree. > > >> > > >> What's happening here? I assume you've decided that the first 8 > > >> patches of the "Per-VMA locks v4" series should be fast-tracked into > > >> 6.3-rcX and backported? And we retain the rest of that series for > > >> 6.4-rc1? > > > > > > Yes, they need to be backported and fast tracked to fix the issue syzbot > > > found. > > > > Stable usually wants the "mainline first" which means fast tracking first, > > then once it's in mainline, they pick it and annotate with mainline commit id. > > Right. I meant these patches won't cleanly apply to 6.1/6.2 and will > need more than just a cherry-pick due to the vma iterator changes. I > have those modified patches ready to go as well. > > > > > One question is how Linus would feel about this now for rc5. > > > > Another question is if we should really deviate in the patch 8/8 backport > > just because it's not necessary for stable. Generally they would also prefer > > not to deviate, unless there's a strong reason. > > Just to clarify, the change is to remove something that isn't necessary > at all. > Andrew, I just wanted to know where we stand with these patches? I understand that it's late in the cycle, but this is a bug that affects 6.1, 6.2, 6.3-rc5 and can be triggered from userspace. I'm asking because the LTS 6.1 is starting to be picked up by distributions, although I don't know the scale of the install, and getting these upstream will allow for the backported fixes to be picked up by stable quicker. Thanks, Liam
