linux-kernel - Re: BUG: using __this_cpu_read() in preemptible code in ip6_finish

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Message-ID: <CACT4Y+bNKFEYDmaXvKhF_h3i1cm_aiSxWT+ppgz=-PAwd_i0tg@mail.gmail.com>
Date:   Fri, 5 Apr 2019 14:36:20 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        amritha.nambiar@...el.com, Alexei Starovoitov <ast@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Edward Cree <ecree@...arflare.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Martin KaFai Lau <kafai@...com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        Li RongQing <lirongqing@...du.com>,
        netdev <netdev@...r.kernel.org>, petrm@...lanox.com,
        Sabrina Dubroca <sd@...asysnail.net>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Yonghong Song <yhs@...com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: BUG: using __this_cpu_read() in preemptible code in ip6_finish_output

On Fri, Apr 5, 2019 at 12:09 PM Florian Westphal <fw@...len.de> wrote:
>
> Krzysztof Kozlowski <krzk@...nel.org> wrote:
> > On Wed, 3 Apr 2019 at 03:14, syzbot
> > <syzbot+51471b4aae195285a4a3@...kaller.appspotmail.com> wrote:
> > >
> > > syzbot has bisected this bug to:
> > >
> > > commit 97cdcf37b57e3f204be3000b9eab9686f38b4356
> > > Author: Florian Westphal <fw@...len.de>
> > > Date:   Mon Apr 1 14:42:13 2019 +0000
> > >
> > >      net: place xmit recursion in softnet data
> >
> > I am seeing this as well on ARMv7 board booted from NFS root (exynos_defconfig):
>
> Sorry about this, the fix is now in net-next though:
> 28b05b92886871bdd ("net: use correct this_cpu primitive in dev_recursion_level")


Krzysztof, just in case, you can see the current bug status on
dashboard as well. E.g. for this one it says:

Fix commit: net: use correct this_cpu primitive in dev_recursion_level