linux-kernel - Re: linux-next test error: WARNING: suspicious RCU usage in ovs_ct

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Date:   Sun, 19 Apr 2020 21:59:52 -0400
From:   Qian Cai <cai@....pw>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+7ef50afd3a211f879112@...kaller.appspotmail.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        David Miller <davem@...emloft.net>, dev@...nvswitch.org,
        kuba@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Pravin B Shelar <pshelar@....org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: linux-next test error: WARNING: suspicious RCU usage in
 ovs_ct_exit



> On Apr 18, 2020, at 3:02 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> 
> On Sat, Mar 14, 2020 at 8:57 AM syzbot
> <syzbot+7ef50afd3a211f879112@...kaller.appspotmail.com> wrote:
>> 
>> Hello,
>> 
>> syzbot found the following crash on:
>> 
>> HEAD commit:    2e602db7 Add linux-next specific files for 20200313
>> git tree:       linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=16669919e00000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=cf2879fc1055b886
>> dashboard link: https://syzkaller.appspot.com/bug?extid=7ef50afd3a211f879112
>> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>> 
>> Unfortunately, I don't have any reproducer for this crash yet.
>> 
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+7ef50afd3a211f879112@...kaller.appspotmail.com
> 
> +linux-next, Stephen for currently open linux-next build/boot failure
> 
>> =============================
>> 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/


>> =============================
>> 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.