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Mon, 11 May 2020 22:06:24 -0700 (PDT) From: Madhuparna Bhowmik X-Google-Original-From: Madhuparna Bhowmik Date: Tue, 12 May 2020 10:36:16 +0530 To: Stephen Rothwell Cc: Madhuparna Bhowmik , Qian Cai , Amol Grover , syzbot , Linux-Next Mailing List , David Miller , kuba@kernel.org, Alexey Kuznetsov , LKML , netdev , syzkaller-bugs , Hideaki YOSHIFUJI , Dmitry Vyukov Subject: Re: linux-next boot error: WARNING: suspicious RCU usage in ip6mr_get_table Message-ID: <20200512050616.GA9585@madhuparna-HP-Notebook> References: <00000000000003dc8f05a50b798e@google.com> <20200507232402.GB2103@madhuparna-HP-Notebook> <20200512112847.3b15d182@canb.auug.org.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200512112847.3b15d182@canb.auug.org.au> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-next-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-next@vger.kernel.org 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 wrote: > > > > On Thu, May 07, 2020 at 08:50:55AM -0400, Qian Cai wrote: > > > > > > > > > > On May 7, 2020, at 5:32 AM, Dmitry Vyukov wrote: > > > > > > > > On Thu, May 7, 2020 at 11:26 AM syzbot > > > > 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@syzkaller.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