linux-kernel - Re: WARNING in __rcu_read

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Message-ID: <CACT4Y+YzM-ud3JkAM9w7K3B9iuZXo0xg_Caujh33fjUy6cfu1A@mail.gmail.com>
Date:   Mon, 17 Dec 2018 16:11:20 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        syzbot <syzbot+43f6755d1c2e62743468@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josh Triplett <josh@...htriplett.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: WARNING in __rcu_read_unlock

On Mon, Dec 17, 2018 at 4:00 PM Stefano Brivio <sbrivio@...hat.com> wrote:
>
> On Mon, 17 Dec 2018 06:57:35 -0800
> Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> > Might be cause by commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e
> > fou, fou6: ICMP error handlers for FoU and GUE
>
> Most likely, yes.
>
> > Please Stefano take a look, thanks !
>
> Started one minute before your email, thanks for Cc'ing me though!


Which reminds me that we need to make KASAN work with VMAP_STACK (or
equivalent):
https://bugzilla.kernel.org/show_bug.cgi?id=202009