From: Oleksandr Natalenko <oleksandr@natalenko.name>
To: Matthew Wilcox <willy@infradead.org>, Miaohe Lin <linmiaohe@huawei.com>
Cc: Boqun Feng <boqun.feng@gmail.com>,
Zhouyi Zhou <zhouzhouyi@gmail.com>,
paulmck@kernel.org, linux-kernel <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org, Chris Clayton <chris2553@googlemail.com>,
Chris Rankin <rankincj@gmail.com>,
Josh Triplett <josh@joshtriplett.org>,
Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
rcu <rcu@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>,
"Huang, Ying" <ying.huang@intel.com>,
gregkh@linuxfoundation.org
Subject: Re: linux-5.13.2: warning from kernel/rcu/tree_plugin.h:359
Date: Mon, 19 Jul 2021 13:59:20 +0200 [thread overview]
Message-ID: <2145858.R0O0FObHBN@natalenko.name> (raw)
In-Reply-To: <8058e175-cec5-c243-6499-c1cd4e3c8605@huawei.com>
On pondělí 19. července 2021 13:50:07 CEST Miaohe Lin wrote:
> On 2021/7/19 19:22, Matthew Wilcox wrote:
> > On Mon, Jul 19, 2021 at 07:12:58PM +0800, Miaohe Lin wrote:
> >> When in the commit 2799e77529c2a, we're using the percpu_ref to serialize
> >> against concurrent swapoff, i.e. there's percpu_ref inside
> >> get_swap_device() instead of rcu_read_lock(). Please see commit
> >> 63d8620ecf93 ("mm/swapfile: use percpu_ref to serialize against
> >> concurrent swapoff") for detail.
> >
> > Oh, so this is a backport problem. 2799e77529c2 was backported without
> > its prerequisite 63d8620ecf93. Greg, probably best to just drop
>
> Yes, they're posted as a patch set:
>
> https://lkml.kernel.org/r/20210426123316.806267-1-linmiaohe@huawei.com
>
> > 2799e77529c2 from all stable trees; the race described is not very
> > important (swapoff vs reading a page back from that swap device).
> > .
>
> The swapoff races with reading a page back from that swap device should be
> really uncommon as most users only do swapoff when the system is going to
> shutdown.
>
> Sorry for the trouble!
git log --oneline v5.13..v5.13.3 --author="Miaohe Lin"
11ebc09e50dc mm/zswap.c: fix two bugs in zswap_writeback_entry()
95d192da198d mm/z3fold: use release_z3fold_page_locked() to release locked
z3fold page
ccb7848e2344 mm/z3fold: fix potential memory leak in z3fold_destroy_pool()
9f7229c901c1 mm/huge_memory.c: don't discard hugepage if other processes are
mapping it
f13259175e4f mm/huge_memory.c: add missing read-only THP checking in
transparent_hugepage_enabled()
afafd371e7de mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX_MASK
a533a21b692f mm/shmem: fix shmem_swapin() race with swapoff
c3b39134bbd0 swap: fix do_swap_page() race with swapoff
Do you suggest reverting "mm/shmem: fix shmem_swapin() race with swapoff" as
well?
--
Oleksandr Natalenko (post-factum)
next prev parent reply other threads:[~2021-07-19 11:59 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-17 20:22 linux-5.13.2: warning from kernel/rcu/tree_plugin.h:359 Chris Clayton
2021-07-18 21:01 ` Oleksandr Natalenko
2021-07-18 21:03 ` Oleksandr Natalenko
2021-07-18 21:22 ` Matthew Wilcox
2021-07-18 21:36 ` Chris Clayton
2021-07-18 21:59 ` Paul E. McKenney
2021-07-18 22:51 ` Matthew Wilcox
2021-07-19 1:53 ` Paul E. McKenney
2021-07-19 2:24 ` Zhouyi Zhou
2021-07-19 2:27 ` Zhouyi Zhou
2021-07-19 2:43 ` Matthew Wilcox
2021-07-19 2:59 ` Zhouyi Zhou
2021-07-19 10:14 ` Boqun Feng
2021-07-19 11:12 ` Miaohe Lin
2021-07-19 11:17 ` Oleksandr Natalenko
2021-07-19 11:22 ` Matthew Wilcox
2021-07-19 11:50 ` Miaohe Lin
2021-07-19 11:59 ` Oleksandr Natalenko [this message]
2021-07-19 12:08 ` Miaohe Lin
2021-07-19 12:12 ` Oleksandr Natalenko
2021-07-19 12:16 ` Matthew Wilcox
2021-07-19 12:23 ` Oleksandr Natalenko
2021-07-19 16:47 ` Zhouyi Zhou
2021-07-19 16:56 ` Zhouyi Zhou
2021-07-22 7:30 ` Chris Clayton
2021-07-22 8:57 ` Zhouyi Zhou
2021-07-22 12:36 ` Matthew Wilcox
2021-07-22 13:26 ` Greg KH
2021-07-22 14:00 ` Greg KH
2021-07-23 1:51 ` Miaohe Lin
2021-07-23 7:02 ` Greg KH
2021-07-23 7:13 ` Miaohe Lin
2021-07-22 17:44 ` Zhouyi Zhou
2021-07-22 14:05 ` Paul E. McKenney
2021-07-19 12:17 ` Miaohe Lin
2021-07-19 7:32 ` Chris Clayton
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