linux-kernel - Re: [syzbot] BUG: corrupted list in hci_conn_add

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Date:   Mon, 7 Nov 2022 13:37:40 -0800
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Luiz Augusto von Dentz <luiz.dentz@...il.com>
Cc:     syzbot <syzbot+b30ccad4684cce846cef@...kaller.appspotmail.com>,
        davem@...emloft.net, edumazet@...gle.com,
        gregkh@...uxfoundation.org, johan.hedberg@...il.com,
        kuba@...nel.org, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, luiz.von.dentz@...el.com,
        marcel@...tmann.org, netdev@...r.kernel.org, pabeni@...hat.com,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com,
        yin31149@...il.com
Subject: Re: [syzbot] BUG: corrupted list in hci_conn_add_sysfs

On Sun, 6 Nov 2022 at 22:39, Luiz Augusto von Dentz
<luiz.dentz@...il.com> wrote:
>
> Hi,
>
> On Sun, Nov 6, 2022 at 3:25 PM Dmitry Vyukov <dvyukov@...gle.com> wrote:
> >
> > On Fri, 4 Nov 2022 at 10:56, syzbot
> > <syzbot+b30ccad4684cce846cef@...kaller.appspotmail.com> wrote:
> > >
> > > syzbot suspects this issue was fixed by commit:
> > >
> > > commit 448a496f760664d3e2e79466aa1787e6abc922b5
> > > Author: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
> > > Date:   Mon Sep 19 17:56:59 2022 +0000
> > >
> > >     Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times
> > >
> > > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1052f8fe880000
> > > start commit:   dc164f4fb00a Merge tag 'for-linus-6.0-rc7' of git://git.ke..
> > > git tree:       upstream
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=122d7bd4fc8e0ecb
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=b30ccad4684cce846cef
> > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1110db8c880000
> > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13e58aef080000
> > >
> > > If the result looks correct, please mark the issue as fixed by replying with:
> > >
> > > #syz fix: Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times
> > >
> > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> >
> >
> > Looks reasonable based on subsystem and the patch:
> >
> > #syz fix: Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times
>
> Looks like I did add a different link when fixing it:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=448a496f760664d3e2e79466aa1787e6abc922b5
>
> Or perhaps they are duplicated?
>
> https://syzkaller.appspot.com/bug?id=da3246e2d33afdb92d66bc166a0934c5b146404a
> https://syzkaller.appspot.com/bug?extid=b30ccad4684cce846cef


Yes, most likely differently looking crashes, but the same root cause.
It happens.