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From:   Thomas Gleixner <tglx@linutronix.de>
To:     syzbot <syzbot+5fd924f4cd9dc1c7828c@syzkaller.appspotmail.com>,
        frederic@kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] possible deadlock in exit_itimers
In-Reply-To: <000000000000cf863605fe4c5f40@google.com>
References: <000000000000cf863605fe4c5f40@google.com>
Date:   Sun, 18 Jun 2023 22:44:36 +0200
Message-ID: <87v8fkqz4b.ffs@tglx>
MIME-Version: 1.0
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On Fri, Jun 16 2023 at 22:14, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 1b59b2577582f9cf3d0f17245675a76859175cc1
> Author: Thomas Gleixner <tglx@linutronix.de>
> Date:   Thu Jun 1 20:16:34 2023 +0000
>
>     posix-timers: Prevent RT livelock in itimer_delete()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=106d46e3280000
> start commit:   f7efed9f38f8 Add linux-next specific files for 20230616
> git tree:       linux-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=126d46e3280000
> console output: https://syzkaller.appspot.com/x/log.txt?x=146d46e3280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=60b1a32485a77c16
> dashboard link: https://syzkaller.appspot.com/bug?extid=5fd924f4cd9dc1c7828c
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1401d8ef280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=176b45cf280000
>
> Reported-by: syzbot+5fd924f4cd9dc1c7828c@syzkaller.appspotmail.com
> Fixes: 1b59b2577582 ("posix-timers: Prevent RT livelock in itimer_delete()")

I've amended the original commit as that is tagged stable.

Thanks for chatching this and reporting!

       tglx