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Date:   Thu, 11 Jun 2020 21:55:23 -0400
From:   Waiman Long <>
To:     Boqun Feng <>
Cc:     Peter Zijlstra <>,
        Dmitry Vyukov <>,
        syzbot <>,
        Alexey Dobriyan <>,
        Andrew Morton <>,,,,
        Andrei Vagin <>,
        Bruce Fields <>,
        Christian Brauner <>,,
        "Eric W. Biederman" <>,
        Greg Kroah-Hartman <>,,
        Jeff Layton <>,
        Joel Fernandes <>,
        Kees Cook <>,,
        linux-fsdevel <>,
        LKML <>,
        Michal Hocko <>, Ingo Molnar <>,
        Oleg Nesterov <>,,
        syzkaller-bugs <>,
        Thomas Gleixner <>,
        Al Viro <>
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:
> 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.


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