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Message-ID: <20200512050616.GA9585@madhuparna-HP-Notebook>
Date: Tue, 12 May 2020 10:36:16 +0530
From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>,
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
On Tue, May 12, 2020 at 11:28:47AM +1000, Stephen Rothwell wrote:
> 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?
>
Hi Stephen,
There are some discussions going on about the ipmr.c patch, I guess even
ip6mr can be fixed in a similar way. Let me still confirm once.
Thank you,
Mahuparna
> --
> Cheers,
> Stephen Rothwell
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