Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 20 Mar 2020 13:00:17 +1100
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Waiman Long <longman@redhat.com>
Cc:     Qian Cai <cai@lca.pw>, Thomas Gleixner <tglx@linutronix.de>,
        "Joel Fernandes (Google)" <joel@joelfernandes.org>,
        "Paul E. McKenney" <paulmck@kernel.org>, rcu@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: Hard lockups due to "tick/common: Make tick_periodic() check
 for missing ticks"
Message-ID: <20200320130017.6457a1e8@canb.auug.org.au>
In-Reply-To: <218eed57-27c8-12c0-6f5f-111874798c21@redhat.com>
References: <CA9BD318-A8C8-4F22-828A-65C355931A5C@lca.pw>
        <F95F95DE-77D9-4A1D-AA5C-CAC165F6B4C8@lca.pw>
        <11BEA1A5-2E93-4E01-A05C-A6BA73A74CEB@lca.pw>
        <218eed57-27c8-12c0-6f5f-111874798c21@redhat.com>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="Sig_/200+A/5+J7anyPW8F._3h2Y";
 protocol="application/pgp-signature"; micalg=pgp-sha256
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

--Sig_/200+A/5+J7anyPW8F._3h2Y
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Hi all,

On Thu, 19 Mar 2020 15:00:35 -0400 Waiman Long <longman@redhat.com> wrote:
>
> On 3/19/20 9:58 AM, Qian Cai wrote:
> > =20
> >> On Mar 6, 2020, at 10:33 PM, Qian Cai <cai@lca.pw> wrote:
> >>
> >>
> >> =20
> >>> On Mar 5, 2020, at 11:06 PM, Qian Cai <cai@lca.pw> wrote:
> >>> =20
> >> Using this config,
> >> =20
> >>> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config =
=20
> >> Reverted the linux-next commit d441dceb5dce (=E2=80=9Ctick/common: Mak=
e tick_periodic() check for missing ticks=E2=80=9D)
> >> fixed the lockup that could easily happen during boot. =20
> >
> > Thomas or Stephen, can you back out this patch from linux-next while Wa=
iman is getting to the bottom of it?
> > I can still reproduce it as today. =20
>=20
> I am fine for reverting the patch for now. I am still having some
> trouble reproducing it and I have other tasks to work on right now. I
> will get to the bottom of it and resubmit a new patch later on.

I have reverted that commit from linux-next today.

--=20
Cheers,
Stephen Rothwell

--Sig_/200+A/5+J7anyPW8F._3h2Y
Content-Type: application/pgp-signature
Content-Description: OpenPGP digital signature

-----BEGIN PGP SIGNATURE-----

iQEzBAEBCAAdFiEENIC96giZ81tWdLgKAVBC80lX0GwFAl50I7EACgkQAVBC80lX
0Gwcpgf9GrNX0tgR+8h70/3dJK9k3j3brlFdojIdgsIoGvZLrAWhWM8U4l+MUhyz
rzZjPYh5wkODl5WslcB98b6psjQv0i+RnbaQVSiKJVqcALwmveJ0YjAAVO0SrVQ5
Ydn33ybWtrnzgnCHrp4HyrqxyEkd9LvFsZwpcxyRPNitrlTyEM1xlNNEl7TIweU2
Pr+cPbX12MX+iZFid3j2n3Jya9ldTwiUtGjaGv0X+R/jUlMUdJJ9CCAG3jFPgoK4
RdwWpJZDkbR2n9T+L41Aaf4eWiALVG+YnBbXwRNXiWuGL8MgjVHALVxtD/gTYMnc
PXT0kDNSrU63uKm9f6g4WpQnPaX57Q==
=hKZY
-----END PGP SIGNATURE-----

--Sig_/200+A/5+J7anyPW8F._3h2Y--