From: Linus Torvalds <torvalds@linux-foundation.org>
To: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: Joel Fernandes <joel@joelfernandes.org>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
William Kucharski <william.kucharski@oracle.com>,
linux- stable <stable@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>, Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
Roman Gushchin <guro@fb.com>, Michal Hocko <mhocko@kernel.org>,
lkft-triage@lists.linaro.org, Chris Down <chris@chrisdown.name>,
Michel Lespinasse <walken@google.com>,
Fan Yang <Fan_Yang@sjtu.edu.cn>,
Brian Geffon <bgeffon@google.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
pugaowei@gmail.com, Jerome Glisse <jglisse@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
Hugh Dickins <hughd@google.com>,
Al Viro <viro@zeniv.linux.org.uk>, Tejun Heo <tj@kernel.org>,
Sasha Levin <sashal@kernel.org>, Oleg Nesterov <oleg@redhat.com>
Subject: Re: WARNING: at mm/mremap.c:211 move_page_tables in i386
Date: Sat, 11 Jul 2020 11:21:43 -0700 [thread overview]
Message-ID: <CAHk-=wg6mHH-LwqMNBcrP2nO8_acb_T2CCsweH-p8BvUFeAWtg@mail.gmail.com> (raw)
In-Reply-To: <CAHk-=wj_Bqu5n3OJCnKiO_gs97fYEpdx6eSacEw2kv9YnnSv_w@mail.gmail.com>
On Sat, Jul 11, 2020 at 11:12 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> The fact that it seems to happen with
>
> https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/thp/thp01.c
>
> makes me think it's somehow related to THP mappings, but I don't see
> why those would matter. All the same pmd freeing should still have
> happened, afaik.
No, I think the only reason it happens with that test-case is simply
because that test-case tests many different argument sizes, and as
part of that it ends up then hitting the "stack is exactly one pmd in
size" case when the stack alignment is right too.
So the THP part is almost certainly a red herring.
Maybe. Considering that I don't see what's wrong, anything is possible.
Linus
next prev parent reply other threads:[~2020-07-11 18:22 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-09 5:28 WARNING: at mm/mremap.c:211 move_page_tables in i386 Naresh Kamboju
2020-07-09 5:28 ` Naresh Kamboju
2020-07-09 8:25 ` Arnd Bergmann
2020-07-10 4:17 ` Naresh Kamboju
2020-07-09 19:12 ` Linus Torvalds
2020-07-09 19:12 ` Linus Torvalds
2020-07-10 4:28 ` Naresh Kamboju
2020-07-10 4:28 ` Naresh Kamboju
2020-07-10 5:22 ` Linus Torvalds
2020-07-10 5:22 ` Linus Torvalds
2020-07-10 17:48 ` Naresh Kamboju
2020-07-10 17:48 ` Naresh Kamboju
2020-07-10 20:05 ` Linus Torvalds
2020-07-10 20:05 ` Linus Torvalds
2020-07-11 17:27 ` Naresh Kamboju
2020-07-11 17:27 ` Naresh Kamboju
2020-07-11 18:12 ` Linus Torvalds
2020-07-11 18:12 ` Linus Torvalds
2020-07-11 18:21 ` Linus Torvalds [this message]
2020-07-11 18:21 ` Linus Torvalds
2020-07-11 23:33 ` Joel Fernandes
2020-07-12 17:30 ` Matthew Wilcox
2020-07-12 20:38 ` Linus Torvalds
2020-07-12 20:38 ` Linus Torvalds
2020-07-12 21:50 ` Joel Fernandes
2020-07-12 22:58 ` Linus Torvalds
2020-07-12 22:58 ` Linus Torvalds
2020-07-13 2:53 ` Joel Fernandes
2020-07-13 3:51 ` Linus Torvalds
2020-07-13 3:51 ` Linus Torvalds
2020-07-13 12:12 ` Joel Fernandes
2020-07-14 7:33 ` Kirill A. Shutemov
2020-07-14 11:27 ` Naresh Kamboju
2020-07-14 11:27 ` Naresh Kamboju
2020-07-14 16:08 ` Joel Fernandes
2020-07-14 16:10 ` Linus Torvalds
2020-07-14 16:10 ` Linus Torvalds
2020-07-14 18:12 ` Joel Fernandes
2020-07-14 18:12 ` Joel Fernandes
2020-07-14 18:49 ` Linus Torvalds
2020-07-14 18:49 ` Linus Torvalds
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