netdev - Re: INFO: rcu detected stall in xfrm_confirm

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Date:   Mon, 19 Feb 2018 08:22:43 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
CC:     syzbot <syzbot+7d03c810e50aaedef98a@...kaller.appspotmail.com>,
        <dzickus@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, <npiggin@...il.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: INFO: rcu detected stall in xfrm_confirm_neigh

On Tue, Feb 13, 2018 at 10:19:17AM +0100, Dmitry Vyukov wrote:
> On Mon, Feb 12, 2018 at 4:26 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > On Mon, Feb 12, 2018 at 4:23 PM, syzbot
> > <syzbot+7d03c810e50aaedef98a@...kaller.appspotmail.com> wrote:
> >> Hello,
> >>
> >> syzbot hit the following crash on net-next commit
> >> 9515a2e082f91457db0ecff4b65371d0fb5d9aad (Thu Jan 25 03:37:38 2018 +0000)
> >> net/ipv4: Allow send to local broadcast from a socket bound to a VRF
> >>
> >> So far this crash happened 6 times on net-next.
> >> Unfortunately, I don't have any reproducer for this crash yet.
> >> Raw console output is attached.
> >> compiler: gcc (GCC) 7.1.1 20170620
> >> .config is attached.
> >
> >
> > +xfrm maintainers
> 
> Here is a C repro:
> https://gist.githubusercontent.com/dvyukov/92c67ba9afaaa960bcfbdc6ef549ac10/raw/786f9221c1d707c7f4a15effcb1d5997dd4f8638/gistfile1.txt

Seems like syzbot does not know about this reproducer.

I've send a patch to test and got this as the reply:

This crash does not have a reproducer. I cannot test it.