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Message-ID: <CANRm+CwrT=gxxgkNdT3wFwzWYYh3FFrUU=aTqH8VT=MraU7jkw@mail.gmail.com>
Date: Wed, 29 Jul 2020 10:38:18 +0800
From: Wanpeng Li <kernellwp@...il.com>
To: Nitesh Narayan Lal <nitesh@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
KVM list <kvm@...r.kernel.org>,
Wanpeng Li <wanpengli@...cent.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Liran Alon <liran.alon@...cle.com>,
"frederic@...nel.org" <frederic@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Juri Lelli <juri.lelli@...hat.com>
Subject: Re: WARNING: suspicious RCU usage - while installing a VM on a CPU
listed under nohz_full
Hi Nitesh,
On Wed, 29 Jul 2020 at 09:00, Wanpeng Li <kernellwp@...il.com> wrote:
>
> On Tue, 28 Jul 2020 at 22:40, Nitesh Narayan Lal <nitesh@...hat.com> wrote:
> >
> > Hi,
> >
> > I have recently come across an RCU trace with the 5.8-rc7 kernel that has the
> > debug configs enabled while installing a VM on a CPU that is listed under
> > nohz_full.
> >
> > Based on some of the initial debugging, my impression is that the issue is
> > triggered because of the fastpath that is meant to optimize the writes to x2APIC
> > ICR that eventually leads to a virtual IPI in fixed delivery mode, is getting
> > invoked from the quiescent state.
Could you try latest linux-next tree? I guess maybe some patches are
pending in linux-next tree, I can't reproduce against linux-next tree.
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