linux-kernel - Re: Circular lockdep in kvm_reset

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Date:   Tue, 14 Mar 2023 11:42:29 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     Oliver Upton <oliver.upton@...ux.dev>,
        Jeremy Linton <jeremy.linton@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: Circular lockdep in kvm_reset_vcpu() ?

On 2023-03-14 11:04, Cristian Marussi wrote:
> On Tue, Mar 14, 2023 at 09:28:25AM +0000, Marc Zyngier wrote:
>> On 2023-03-13 18:20, Cristian Marussi wrote:
>> > On Mon, Mar 13, 2023 at 02:09:55PM +0000, Marc Zyngier wrote:
>> 
>> > > And -rc2 works just fine here.
>> >
>> > Thanks, I'll dig deeper what's going on un my setup.
>> 
>> Actually, you really want this patch[1] which is on its
>> way to Linus.
>> 
>> It could explain the issue you're seeing with SMP.
> 
> Hi Marc,
> 
> thanks this just solves for me on JUNO with guest SMP.
> 
> Indeed with earlycon on JUNO with SMP I was seeing, beside a lot of
> workqueue lockup that finally hanged the guest, some puzzling
> 'time-traveling' stamps that seemed to align more with the host time
> than the guest.

Yeah, my bad. Thankfully, Paolo just pulled the fix, and it should
make it into -rc3 (fingers crossed).

         M.
-- 
Jazz is not dead. It just smells funny...