linux-kernel - Re: possible deadlock in send

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Message-ID: <20200611235526.GC94665@debian-boqun.qqnc3lrjykvubdpftowmye0fmh.lx.internal.cloudapp.net>
Date:   Fri, 12 Jun 2020 07:55:26 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+a9fb1457d720a55d6dc5@...kaller.appspotmail.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, allison@...utok.net,
        areber@...hat.com, aubrey.li@...ux.intel.com,
        Andrei Vagin <avagin@...il.com>,
        Bruce Fields <bfields@...ldses.org>,
        Christian Brauner <christian@...uner.io>, cyphar@...har.com,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>, guro@...com,
        Jeff Layton <jlayton@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Kees Cook <keescook@...omium.org>, linmiaohe@...wei.com,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>, sargun@...gun.me,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: possible deadlock in send_sigio

Hi Peter and Waiman,

On Thu, Jun 11, 2020 at 12:09:59PM -0400, Waiman Long wrote:
> On 6/11/20 10:22 AM, Peter Zijlstra wrote:
> > On Thu, Jun 11, 2020 at 09:51:29AM -0400, Waiman Long wrote:
> > 
> > > There was an old lockdep patch that I think may address the issue, but was
> > > not merged at the time. I will need to dig it out and see if it can be
> > > adapted to work in the current kernel. It may take some time.
> > Boqun was working on that; I can't remember what happened, but ISTR it
> > was shaping up nice.
> > 
> Yes, I am talking about Boqun's patch. However, I think he had moved to
> another company and so may not be able to actively work on that again.
> 

I think you are talking about the rescursive read deadlock detection
patchset:

	https://lore.kernel.org/lkml/20180411135110.9217-1-boqun.feng@gmail.com/

Let me have a good and send a new version based on today's master of tip
tree.

Regards,
Boqun

> Cheers,
> Longman
>