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Date:   Tue, 12 May 2020 11:28:47 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Cc:     Qian Cai <cai@lca.pw>, Amol Grover <frextrite@gmail.com>,
        syzbot <syzbot+761cff389b454aa387d2@syzkaller.appspotmail.com>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        David Miller <davem@davemloft.net>, kuba@kernel.org,
        Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
        LKML <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
        Dmitry Vyukov <dvyukov@google.com>
Subject: Re: linux-next boot error: WARNING: suspicious RCU usage in
 ip6mr_get_table
Message-ID: <20200512112847.3b15d182@canb.auug.org.au>
In-Reply-To: <20200507232402.GB2103@madhuparna-HP-Notebook>
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        <DB6FF2E0-4605-40D1-B368-7D813518F6F7@lca.pw>
        <20200507232402.GB2103@madhuparna-HP-Notebook>
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Hi all,

On Fri, 8 May 2020 04:54:02 +0530 Madhuparna Bhowmik <madhuparnabhowmik10@g=
mail.com> wrote:
>
> On Thu, May 07, 2020 at 08:50:55AM -0400, Qian Cai wrote:
> >=20
> >  =20
> > > On May 7, 2020, at 5:32 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
> > >=20
> > > On Thu, May 7, 2020 at 11:26 AM syzbot
> > > <syzbot+761cff389b454aa387d2@syzkaller.appspotmail.com> wrote: =20
> > >>=20
> > >> Hello,
> > >>=20
> > >> syzbot found the following crash on:
> > >>=20
> > >> HEAD commit:    6b43f715 Add linux-next specific files for 20200507
> > >> git tree:       linux-next
> > >> console output: https://syzkaller.appspot.com/x/log.txt?x=3D16f64370=
100000
> > >> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Def9b7a80=
b923f328
> > >> dashboard link: https://syzkaller.appspot.com/bug?extid=3D761cff389b=
454aa387d2
> > >> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > >>=20
> > >> Unfortunately, I don't have any reproducer for this crash yet.
> > >>=20
> > >> IMPORTANT: if you fix the bug, please add the following tag to the c=
ommit:
> > >> Reported-by: syzbot+761cff389b454aa387d2@syzkaller.appspotmail.com =
=20
> > >=20
> > >=20
> > > +linux-next for linux-next boot breakage =20
> >=20
> > Amol, Madhuparna, Is either of you still working on this?
> >  =20
> > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
> > >> WARNING: suspicious RCU usage
> > >> 5.7.0-rc4-next-20200507-syzkaller #0 Not tainted
> > >> -----------------------------
> > >> net/ipv6/ip6mr.c:124 RCU-list traversed in non-reader section!!
> > >> =20
> I had some doubt in this one, I have already mailed the maintainers,
> waiting for their reply.

This is blocking syzbot testing of linux-next ... are we getting
anywhere?  Will a patch similar to the ipmr.c one help here?

--=20
Cheers,
Stephen Rothwell

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