linux-kernel - Re: linux-next boot error: WARNING: suspicious RCU usage in ip6mr_get

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Date:   Tue, 12 May 2020 11:28:47 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Cc:     Qian Cai <cai@....pw>, Amol Grover <frextrite@...il.com>,
        syzbot <syzbot+761cff389b454aa387d2@...kaller.appspotmail.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        David Miller <davem@...emloft.net>, kuba@...nel.org,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: linux-next boot error: WARNING: suspicious RCU usage in
 ip6mr_get_table

Hi all,

On Fri, 8 May 2020 04:54:02 +0530 Madhuparna Bhowmik <madhuparnabhowmik10@...il.com> wrote:
>
> On Thu, May 07, 2020 at 08:50:55AM -0400, Qian Cai wrote:
> > 
> >   
> > > On May 7, 2020, at 5:32 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > > 
> > > On Thu, May 7, 2020 at 11:26 AM syzbot
> > > <syzbot+761cff389b454aa387d2@...kaller.appspotmail.com> wrote:  
> > >> 
> > >> Hello,
> > >> 
> > >> syzbot found the following crash on:
> > >> 
> > >> HEAD commit:    6b43f715 Add linux-next specific files for 20200507
> > >> git tree:       linux-next
> > >> console output: https://syzkaller.appspot.com/x/log.txt?x=16f64370100000
> > >> kernel config:  https://syzkaller.appspot.com/x/.config?x=ef9b7a80b923f328
> > >> dashboard link: https://syzkaller.appspot.com/bug?extid=761cff389b454aa387d2
> > >> 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+761cff389b454aa387d2@...kaller.appspotmail.com  
> > > 
> > > 
> > > +linux-next for linux-next boot breakage  
> > 
> > Amol, Madhuparna, Is either of you still working on this?
> >   
> > >> =============================
> > >> 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!!
> > >>  
> 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?

-- 
Cheers,
Stephen Rothwell

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