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Date:   Thu, 11 Jun 2020 21:55:23 -0400
From:   Waiman Long <longman@...hat.com>
To:     Boqun Feng <boqun.feng@...il.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

On 6/11/20 7:55 PM, Boqun Feng wrote:
> 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

Good to hear back from you. I thought you may not able to work on it again.

Cheers,
Longman


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