linux-kernel - Re: [syzbot] WARNING in futex

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Message-ID: <87fsuocbuu.ffs@tglx>
Date:   Wed, 01 Sep 2021 21:52:25 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     syzbot <syzbot+4d1bd0725ef09168e1a0@...kaller.appspotmail.com>,
        dave@...olabs.net, dvhart@...radead.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in futex_requeue

On Wed, Sep 01 2021 at 06:26, syzbot wrote:
> syzbot found the following issue on:
>
> HEAD commit:    b91db6a0b52e Merge tag 'for-5.15/io_uring-vfs-2021-08-30' ..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17907235300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=961d30359ac81f8c
> dashboard link: https://syzkaller.appspot.com/bug?extid=4d1bd0725ef09168e1a0
> compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1222185d300000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4d1bd0725ef09168e1a0@...kaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 5701 at kernel/futex.c:2259 futex_requeue+0x1467/0x2d50 kernel/futex.c:2259

Doh. That Gleixner dude did not think this through completely. Fix will
follow.

Thanks,

        tglx