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Subject: Re: linux-next test error: WARNING: suspicious RCU usage in
 ovs_ct_exit
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <CACT4Y+YR5Y8OQ4MCdCA2eoQM=GdBXN39O4HahWtL0sdqwsB=mg@mail.gmail.com>
Date:   Sun, 19 Apr 2020 21:59:52 -0400
Cc:     syzbot <syzbot+7ef50afd3a211f879112@syzkaller.appspotmail.com>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        David Miller <davem@davemloft.net>, dev@openvswitch.org,
        kuba@kernel.org, LKML <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>,
        Pravin B Shelar <pshelar@ovn.org>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>
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 <CACT4Y+YR5Y8OQ4MCdCA2eoQM=GdBXN39O4HahWtL0sdqwsB=mg@mail.gmail.com>
To:     Dmitry Vyukov <dvyukov@google.com>
Sender: linux-kernel-owner@vger.kernel.org
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> On Apr 18, 2020, at 3:02 AM, Dmitry Vyukov <dvyukov@google.com> wrote:
>=20
> On Sat, Mar 14, 2020 at 8:57 AM syzbot
> <syzbot+7ef50afd3a211f879112@syzkaller.appspotmail.com> wrote:
>>=20
>> Hello,
>>=20
>> syzbot found the following crash on:
>>=20
>> HEAD commit:    2e602db7 Add linux-next specific files for 20200313
>> git tree:       linux-next
>> console output: =
https://syzkaller.appspot.com/x/log.txt?x=3D16669919e00000
>> kernel config:  =
https://syzkaller.appspot.com/x/.config?x=3Dcf2879fc1055b886
>> dashboard link: =
https://syzkaller.appspot.com/bug?extid=3D7ef50afd3a211f879112
>> 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 =
commit:
>> Reported-by: syzbot+7ef50afd3a211f879112@syzkaller.appspotmail.com
>=20
> +linux-next, Stephen for currently open linux-next build/boot failure
>=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
>> 5.6.0-rc5-next-20200313-syzkaller #0 Not tainted
>> -----------------------------
>> net/openvswitch/conntrack.c:1898 RCU-list traversed in non-reader =
section!

Those should be fixed by,

=
https://lore.kernel.org/netdev/1587063451-54027-1-git-send-email-xiangxia.=
m.yue@gmail.com/


>> =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
>> 5.6.0-rc5-next-20200313-syzkaller #0 Not tainted
>> -----------------------------
>> net/ipv4/ipmr.c:1757 RCU-list traversed in non-reader section!!

and,

=
https://lore.kernel.org/netdev/20200222063835.14328-1-frextrite@gmail.com/=


It looks like both are waiting for David to pick up.=