linux-kernel - Re: linux-5.13.2: warning from kernel/rcu/tree

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Message-ID: <YPppbUqSPTNcm3f9@kroah.com>
Date:   Fri, 23 Jul 2021 09:02:05 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Zhouyi Zhou <zhouzhouyi@...il.com>,
        Chris Clayton <chris2553@...glemail.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Boqun Feng <boqun.feng@...il.com>, paulmck@...nel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org, Chris Rankin <rankincj@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        rcu <rcu@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        "Huang, Ying" <ying.huang@...el.com>
Subject: Re: linux-5.13.2: warning from kernel/rcu/tree_plugin.h:359

On Fri, Jul 23, 2021 at 09:51:09AM +0800, Miaohe Lin wrote:
> On 2021/7/22 22:00, Greg KH wrote:
> > On Thu, Jul 22, 2021 at 03:26:52PM +0200, Greg KH wrote:
> >> On Thu, Jul 22, 2021 at 01:36:02PM +0100, Matthew Wilcox wrote:
> >>> On Thu, Jul 22, 2021 at 04:57:57PM +0800, Zhouyi Zhou wrote:
> >>>> Thanks for reviewing,
> >>>>
> >>>> What I have deduced from the dmesg  is:
> >>>> In function do_swap_page,
> >>>> after invoking
> >>>> 3385        si = get_swap_device(entry); /* rcu_read_lock */
> >>>> and before
> >>>> 3561    out:
> >>>> 3562        if (si)
> >>>> 3563            put_swap_device(si);
> >>>> The thread got scheduled out in
> >>>> 3454        locked = lock_page_or_retry(page, vma->vm_mm, vmf->flags);
> >>>>
> >>>> I am only familiar with Linux RCU subsystem, hope mm people can solve our
> >>>> confusions.
> >>>
> >>> I don't understamd why you're still talking.  The problem is understood.
> >>> You need to revert the unnecessary backport of 2799e77529c2 and
> >>> 2efa33fc7f6e
> >>
> >> Sorry for the delay, will go do so in a minute...
> > 
> > Both now reverted from 5.10.y and 5.13.y.
> > 
> 
> I browsed my previous backport notifying email and found that these two patches are also
> backported into 5.12. And it seems it's missed.

5.12 is now end-of-life, it's not being touched anymore, and no one
should continue to use it.

thanks,

greg k-h