linux-kernel - Re: inconsistent lock state in ila_xlat_nl_cmd_add

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Date:   Tue, 29 Dec 2020 17:52:56 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     syzbot <syzbot+eaaf6c4a6a8cb1869d86@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Tom Herbert <tom@...bertland.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: inconsistent lock state in ila_xlat_nl_cmd_add_mapping

On Tue, Dec 29, 2020 at 5:39 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 13 Aug 2018 21:40:03 -0700 syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    78cbac647e61 Merge branch 'ip-faster-in-order-IP-fragments'
> > git tree:       net-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14df4828400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=9100338df26ab75
> > dashboard link: https://syzkaller.appspot.com/bug?extid=eaaf6c4a6a8cb1869d86
> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=13069ad2400000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+eaaf6c4a6a8cb1869d86@...kaller.appspotmail.com
>
> #syz invalid
>
> Hard to track down what fixed this, but the lockdep splat is mixing up
> locks from two different hashtables, so there was never a real issue
> here.

This one is probably fixed by:

commit ff93bca769925a2d8fd7f910cdf543d992e17f07
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Tue Aug 14 15:21:31 2018 -0700

    ila: make lockdep happy again

given the time of last reproducing...

Thanks.