linux-kernel - Re: possible deadlock in send

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Message-ID: <CACT4Y+Z4OprUOs6Asp-L=UCM_VGARKremp-w594Dp6dDenoUXQ@mail.gmail.com>
Date:   Mon, 1 Feb 2021 09:03:32 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+907b8537e3b0e55151fc@...kaller.appspotmail.com>
Cc:     Bruce Fields <bfields@...ldses.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Will Deacon <will@...nel.org>
Subject: Re: possible deadlock in send_sigio (2)

On Fri, Jan 29, 2021 at 6:36 PM syzbot
<syzbot+907b8537e3b0e55151fc@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 8d1ddb5e79374fb277985a6b3faa2ed8631c5b4c
> Author: Boqun Feng <boqun.feng@...il.com>
> Date:   Thu Nov 5 06:23:51 2020 +0000
>
>     fcntl: Fix potential deadlock in send_sig{io, urg}()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17455db4d00000
> start commit:   7b1b868e Merge tag 'for-linus' of git://git.kernel.org/pub..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3416bb960d5c705d
> dashboard link: https://syzkaller.appspot.com/bug?extid=907b8537e3b0e55151fc
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=163e046b500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12f8b623500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: fcntl: Fix potential deadlock in send_sig{io, urg}()
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: fcntl: Fix potential deadlock in send_sig{io, urg}()