On Tue, 2021-01-05 at 11:42 -0800, Shakeel Butt wrote:

On Tue, Jan 5, 2021 at 11:30 AM Qian Cai [off-list ref] wrote:

quoted

On Thu, 2020-11-05 at 16:55 +0800, Alex Shi wrote:

quoted

This version rebase on next/master 20201104, with much of Johannes's
Acks and some changes according to Johannes comments. And add a new patch
v21-0006-mm-rmap-stop-store-reordering-issue-on-page-mapp.patch to support
v21-0007.

This patchset followed 2 memcg VM_WARN_ON_ONCE_PAGE patches which were
added to -mm tree yesterday.

Many thanks for line by line review by Hugh Dickins, Alexander Duyck and
Johannes Weiner.

Given the troublesome history of this patchset, and had been put into linux-
next
recently, as well as it touched both THP and mlock. Is it a good idea to
suspect
this patchset introducing some races and a spontaneous crash with some mlock
memory presume?

This has already been merged into the linus tree. Were you able to get
a similar crash on the latest upstream kernel as well?

No, I seldom test the mainline those days. Before the vacations, I have tested
linux-next up to something like 12/10 which did not include this patchset IIRC
and never saw any crash like this. I am still trying to figure out how to
reproduce it fast, so I can try a revert to confirm.