linux-kernel - Re: kvm/x86: perf: Softlockup issue

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Date:   Wed, 4 Oct 2023 03:08:54 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, rcu@...r.kernel.org, rbc@...a.com
Subject: Re: kvm/x86: perf: Softlockup issue

Hello Jim,

On Tue, Oct 03, 2023 at 07:36:48AM -0700, Jim Mattson wrote:
> On Tue, Oct 3, 2023 at 6:52 AM Breno Leitao <leitao@...ian.org> wrote:
> >
> > I've been pursuing a bug in a virtual machine (KVM) that I would like to share
> > in here. The VM gets stuck when running perf in a VM and getting soft lockups.
> >
> > The bug happens upstream (Linux 6.6-rc4 - 8a749fd1a8720d461). The same kernel
> > is being used in the host and in the guest.
> 
> Have you tried https://lore.kernel.org/kvm/169567819674.170423.4384853980629356216.b4-ty@google.com/?

Thanks for the heads-up. These two patches indeed fix the problem.
Thanks for getting the problem fixed.

Tested-by: Breno Leitao <leitao@...ian.org>

Breno